mlso.daily.2021 --------------- The following is a list of activity as noted by HAO staff in Boulder, where the MLSO data are processed and analyzed. More information concerning observations at MLSO can be found at http://mlso.hao.ucar.edu. Dates are given by calendar day and by year/day-of-year. but note that the activity report refers to the MLSO observing day, NOT to the calendar day. The typical observing day at MLSO is from about 1700-1730UT to about 0200UT. ----------------------------------------------------------------------- Key to abbreviations: AR Active Region CME Coronal Mass Ejection PA Position angle (measured counterclockwise from north pole. e.g., east equator = 90 degrees, west equator = 270 degrees) R Solar radius: e.g., 0.9R is 0.9 solar radii from sun center projected onto the plane of the sky. UT Universal time ----------------------------------------------------------------------- 2021-01-01 2021d001 KCor: No observations at MLSO today. 2021-01-02 2021d002 KCor: No noticeable coronal activity. 2021-01-03 2021d003 KCor: No noticeable coronal activity. Coronal cavity in the SW. Dark coronal cavity with small, very bright prominence in the NW. Narrow jet over the N pole, ~2230-2238UT, best seen in difference movie. 2021-01-04 2021d004 KCor: No noticeable coronal activity. Dark coronal cavity in the SW. Dark coronal cavity with small bright prominence in the NW. 2021-01-05 2021d005 KCor: No observations at MLSO today. 2021-01-06 2021d006 KCor: No noticeable coronal activity. 2021-01-07 2021d007 KCor: Faint outward motion in the W, appears to be the eruption of a very faint elongated cavity, noticeable at about 0108-0221UT Prominence eruption in the SW, loop outward motion noticeable at the end of the observing day, best seen in difference movie at about 0240-0320UT, corresponds to a large filament eruption seen on-disk in SDO 2021-01-08 2021d008 KCor: No noticeable coronal activity. Faint jet in the NW at about 2145-2205UT, best seen in difference movies. 2021-01-09 2021d009 KCor: No noticeable coronal activity. 2315-0011UT possible prominence eruption in the SE. Possible pseudostreamer in the SW. Two coronal cavity in the N-NW and NW, possible pseudostreamer. 2021-01-10 2021d010 KCor: No noticeable coronal activity. Dark coronal cavity in the NW. 2021-01-11 2021d011 KCor: No noticeable coronal activity. Round coronal cavity in the SE. Dark coronal cavity in the NW. 2021-01-12 2021d012 KCor: No noticeable coronal activity. Coronal cavities in the SE, SW, and NW. 2021-01-13 2021d013 KCor: No noticeable coronal activity. Coronal cavity in the SW. Active prominence in the NW. 2021-01-14 2021d014 KCor: No noticeable coronal activity. Faint coronal cavity in the SW. 2021-01-15 2021d015 KCor: Possible CME in progress at the E limb, at ~PA90. 2021-01-16 2021d016 KCor: No noticeable coronal activity. 2021-01-17 2021d017 KCor: No noticeable coronal activity. Large coronal cavity in the SE. Active prominence in the NW. 2021-01-18 2021d018 KCor: No noticeable coronal activity. Large, dark coronal cavity in the SE. 2021-01-19 2021d019 No observations at MLSO today. Overcast 2021-01-20 2021d020 No observations at MLSO today. Cloudy. 2021-01-21 2021d021 No observations at MLSO today. Cirrus. 2021-01-22 2021d022 KCor: No noticeable coronal activity. 2021-01-23 2021d023 No observations at MLSO today. Cloudy. 2021-01-24 2021d024 KCor: Arching eruptive prominence in the SE at ~1919-2142UT, also visible in SDO Coronal cavity in the SW. 2021-01-25 2021d025 No observations at MLSO today. Overcast. 2021-01-26 2021d026 No observations at MLSO today. Overcast. 2021-01-27 2021d027 No observations at MLSO today. Overcast. 2021-01-28 2021d028 KCor: Small coronal cavity in the N-NE Large coronal cavity in the NW with active prominence. Possible faint CME in the E only noticeable in difference movies at about 2150-0022UT 2021-01-29 2021d029 KCor: Faint, arched eruptive prominence at the E-NE limb at about ~2327-0209UT, in progress at the beginning of the day, moves equatorward Very active prominence in the NE 2021-01-30 2021d030 KCor: Faint eruption in progress in the E-NE, possible faint CME or cavity eruption. 2021-01-31 2021d031 KCor: Coronal cavity in the SW. 2021-02-01 2021d032 KCor: Dark, oval, coronal cavity in the SW. Faint coronal cavity in the NW 2021-02-02 2021d033 KCor: Coronal cavity in the SW. 2021-02-03 2021d034 KCor: Dark coronal cavity in the SW. 2021-02-04 2021d035 KCor: No noticeable coronal activity. 2021-02-05 2021d036 KCor: Amorphous CME or outflow in the E-NE best noticeable in difference movies around 01:00-02:00UT. Outflow seen in SDO bit no visible LASCO CME. 2021-02-06 2021d037 KCor: Narrow jet in the E-NE 0057-0107UT noticeable in difference movie. Coronal cavity in the SE. 2021-02-07 2021d038 KCor: No noticeable coronal activity. Dark coronal cavity in the SE with small bright prominence. 2021-02-08 2021d039 KCor: No noticeable coronal activity. Very dark coronal cavity in the SE with tall, very bright prominence. Small coronal cavity in the NW. 2021-02-09 2021d040 No observations at MLSO today. Cloudy 2021-02-10 2021d041 KCor: No noticeable coronal activity. Coronal cavity in the NE. Dark, large coronal cavity in the SW. 2021-02-11 2021d042 KCor: No noticeable coronal activity. Coronal cavity in the NE with small bright prominence. Dark coronal cavity in the SW. 2021-02-12 2021d043 KCor: CME/Prominence eruption in progress in the W-SW visible at about 1757:2203UT The CME appears as a dark cavity with a twisted prominence moving outward, there is no clear front 2021-02-13 2021d044 KCor: No noticeable coronal activity. 2021-02-14 2021d045 KCor: No noticeable coronal activity. 2021-02-15 2021d046 KCor: Possible active prominence in the E-NE. 2021-02-16 2021d047 KCor: Possible surging or active prominence in the E-NE. Narrow jet in the N, noticeable in difference movies. 2021-02-17 2021d048 KCor: Coronal cavity in the NE. Large coronal cavity in the SE. 2021-02-18 2021d049 No observations at MLSO today. Light rain. 2021-02-19 2021d050 No observations at MLSO today. Cirrus. 2021-02-20 2021d051 No observations at MLSO today. Overcast. 2021-02-21 2021d052 No observations at MLSO today. Cirrus. 2021-02-22 2021d053 KCor: Small coronal cavity in the NE. Large coronal cavity in the SE. faint, narrow CME in progress in the SW visible at about 1749:0025UT. 2021-02-23 2021d054 KCor: Small dark coronal cavity in the NE. Large dark coronal cavity in the SE. 2021-02-24 2021d055 KCor: Small coronal cavity in the NE. Large, dark coronal cavity in the SE. 2021-02-25 2021d056 KCor: Faint, small coronal cavity in the N-NE. Faint, large coronal cavity in the SE. 2021-02-26 2021d057 No observations at MLSO today. Cirrus. 2021-02-27 2021d058 KCor: Faint coronal cavity in the SE. Faint, CME in progress in the W-NW at about 1754-1900UT, there is a large prominence eruption in the W-SW captured by SDO and a CME with twisted core seen by LASCO earlier in the day, but the outward motion noticeable in KCor seems to correspond to a flaring AR near the W-NW limb 2021-02-28 2021d059 No observations at MLSO today. Observatory closed because of bad weather. 2021-03-01 2021d060 No observations at MLSO today. Heavy rain and ice. 2021-03-02 2021d061 KCor: Coronal cavity in the SW. Large coronal cavity in the NW. CME at the end of the observing day, ~0150-0250UT, from the AR at/behind the limb, also visible in SDO. 2021-03-03 2021d062 KCor: Coronal cavity in the SW. Faint CME in the SW, noticeable after data gap at 2144-2222UT 2021-03-04 2021d063 No observations at MLSO today. Cloudy. 2021-03-05 2021d064 No observations at MLSO today. Cloudy. 2021-03-06 2021d065 KCor: No noticeable coronal activity. Apparent pseudostreamer, two coronal cavities in the S-SW. 2021-03-07 2021d066 KCor: No noticeable coronal activity. 2021-03-08 2021d067 No observations at MLSO today. Overcast. 2021-03-09 2021d068 No observations at MLSO today. Overcast. 2021-03-10 2021d069 No observations at MLSO today. Cirrus. 2021-03-11 2021d070 No observations at MLSO today. Overcast. 2021-03-12 2021d071 KCor: No noticeable coronal activity. Large coronal cavity in the NE. Large coronal cavity in the SW. Small coronal cavity with small prominence in the NW. 2021-03-13 2021d072 No observations at MLSO today. Overcast. 2021-03-14 2021d073 No observations at MLSO today. Overcast. 2021-03-15 2021d074 KCor: No noticeable coronal activity. Dark coronal cavity in the NE. Coronal cavity in the SE. 2021-03-16 2021d075 KCor: No noticeable coronal activity. Dark coronal cavity in the NE with bright prominence. Coronal cavity in the E. Coronal cavity in the SE. 2021-03-17 2021d076 KCor: No noticeable coronal activity. Coronal cavity in the NE Coronal cavity in the E with small bright prominence. Coronal cavity in the SE. 2021-03-18 2021d077 KCor: No noticeable coronal activity. 2021-03-19 2021d078 KCor: No noticeable coronal activity. Pseudostreamer in the SE with two cavities underneath 2021-03-20 2021d079 KCor: Surge or possible CME in the E-NE visible at about 1900-1920UT Prominences in the SW. 2021-03-21 2021d080 KCor: CME with twisted in the SE noticeable at 2300-0152UT Tall elongated coronal cavity in the SW, possibly pre-eruptive Faint CME in the NW at 0132-0152UT. 2021-03-22 2021d081 KCor: No noticeable coronal activity. Coronal cavity in the NE. Very tall, elongated coronal cavity in the SW, possibly pre-eruptive 2021-03-23 2021d082 KCor: No noticeable coronal activity. Dark, round, coronal cavity in the NE. Elongated coronal cavity in the SW. 2021-03-24 2021d083 KCor: No noticeable coronal activity. Coronal cavity in the NE. 2021-03-25 2021d084 KCor: Small eruption/possible CME in the E-NE originates behind/at the limb at ~1863-1933UT 2021-03-26 2021d085 KCor: Large coronal cavity in the SE. Small eruption or surge in the NW at about 2216-2311UT 2021-03-27 2021d086 KCor: Coronal cavities in the SE. Apparent pseudostreamer. 2021-03-28 2021d087 No observations at MLSO today. Overcast. 2021-03-29 2021d088 No observations at MLSO today. Overcast. 2021-03-30 2021d089 KCor: No noticeable coronal activity. Very short observing day. Tall spider prominence in the NW. SDO data the following day shows it is in its pre-eruptive state. 2021-03-31 2021d090 KCor: No good images today 2021-04-01 2021d091 KCor: No noticeable coronal activity. Coronal cavity in the SW, possible pseudo-streamer. 2021-04-02 2021d092 KCor: No noticeable coronal activity. Possible pseudo-streamer. 2021-04-03 2021d093 No observations at MLSO today. Overcast. 2021-04-04 2021d094 No observations at MLSO today. Overcast. 2021-04-05 2021d095 KCor: No noticeable coronal activity. Coronal cavity in the NE. Two coronal cavities in the S-SW, one has a bright prominence 2021-04-06 2021d096 KCor: No noticeable coronal activity. Large coronal cavity in the NE. One coronal cavity and one prominence nearby in the S-SW. Small coronal cavity in the NW. 2021-04-07 2021d097 No observations at MLSO today. Overcast. 2021-04-08 2021d098 KCor: No noticeable coronal activity. Coronal cavity in the S-SW. Small, dark coronal cavity in the NE. 2021-04-09 2021d099 No observations at MLSO today. Cirrus 2021-04-10 2021d100 KCor: No noticeable coronal activity. Coronal cavities in the NE, SW, and NW. 2021-04-11 2021d101 KCor: No noticeable coronal activity. Coronal cavities in the NE, SW (two faint cavities), and NW, 2021-04-12 2021d102 KCor: Large, dark coronal cavity in the NE. CME in the NE with round bright front, noticeable at about 1919-1938UT. 2021-04-13 2021d103 KCor: No noticeable coronal activity. Large, very dark coronal cavity in the NE. 2021-04-14 2021d104 KCor: No noticeable coronal activity. Coronal cavity in the NE. Tall, very narrow, and bright active prominence in the E. Small dark cavity appears to form in the E-SE, this seems associated with a rising AR loop seen in SDO. 2021-04-15 2021d105 KCor: No noticeable coronal activity. Faint coronal cavity in the SE. 2021-04-16 2021d106 No observations at MLSO today. Cloudy 2021-04-17 2021d107 KCor: Small, dark coronal cavity in the SE. Small, dark coronal cavity in the SW. Faint motion detected in the E, appears to be the end of an AR eruption, from the AR at the limb, ~1713-200UT Prominence eruption in progress in the NW, at about 1713-2100UT, some material falls back down. 2021-04-18 2021d108 No observations at MLSO today. Cirrus. 2021-04-19 2021d109 No observations at MLSO today. Cirrus. 2021-04-20 2021d110 KCor: No noticeable coronal activity. Two coronal cavities in the SE. Coronal cavity in the SW. 2021-04-21 2021d111 No observations at MLSO today. Cirrus. 2021-04-22 2021d112 KCor: No noticeable coronal activity. Coronal cavity in the SE. 2021-04-23 2021d113 KCor: Very dark and sharp coronal cavity in the NE with small prominence. Very dark and sharp coronal cavity in the SE. Very faint eruption in the W, best noticeable in the difference movie, at ~1959-2024UT 2021-04-24 2021d114 KCor: Very dark and sharp, round coronal cavity in the NE. Very dark and sharp coronal cavity in the SE. Dark coronal cavity with low-lying active prominence in the NW noticeable towards the end of the observing day. 2021-04-25 2021d115 KCor: Very dark and sharp, roundish coronal cavity in the NE with small bright prominence. Dark coronal cavity in the SE. Large and very tall coronal cavity in the NW. Faint motion in the W-SW noticeable during the second half of the observing day, at 2232-0033UT. 2021-04-26 2021d116 No observations at MLSO today. Cirrus 2021-04-27 2021d117 KCor: Dark, roundish coronal cavity in the NE with small bright prominence. Very dark, sharp, round coronal cavity in the NW. 2021-04-28 2021d118 No observations at MLSO today. Cirrus 2021-04-29 2021d119 KCor: Three-part CME in progress in the NE limb, ~1701-2146UT, moves equatorward. The CME has a thin bright front, large dark cavity and bright prominence core. It corresponds to the eruption of the sharp coronal cavity seen during the previous days. Dark, sharp coronal cavity in the NW. 2021-04-30 2021d120 KCor: No noticeable coronal activity. 2021-05-01 2021d121 KCor: Arched thin active prominence material moves along an arched trajectory and outward apparent faint eruption, 2204-2355UT Faint coronal cavity in the SW. 2021-05-02 2021d122 KCor: No noticeable coronal activity. 2021-05-03 2021d123 KCor: Pseudostreamer in the SW. Dark large coronal cavity in then NW. Wide CME with round very bright front in the SW at ~2046-2152UT. 2021-05-04 2021d124 No observations at MLSO today. Fog and clouds. 2021-05-05 2021d125 No observations at MLSO today. Cloudy. 2021-05-06 2021d126 No observations at MLSO today. 2021-05-07 2021d127 KCor: Dark coronal cavity in the S-SW. Fast CME in the E, at ~1852-2005UT, with bright round front and bright core, originates in the AR in the NE near the limb, is associated with an M--class flare 2021-05-08 2021d128 KCor: Tall, elongated, balloon-shaped coronal cavity with bright prominence in the N-NE, in a pre-eruptive state. MLSO captures only the very beginning of the cavity/prominence eruption at the end of the observing day. Very dark, small coronal cavity in the S-SW. 2021-05-09 2021d129 No observations at MLSO today. Cloudy. 2021-05-10 2021d130 KCor: Very tall coronal cavity in the NE. Small coronal cavity in the NW. 2021-05-11 2021d131 KCor: Faint, tall coronal cavity in the NE. Slow CME in progress in the SW at the beginning of the observing day, appears as a twisted dark structure/cavity moving outward. 2021-05-12 2021d132 KCor: No noticeable coronal activity. Small, faint coronal cavity in the NE. 2021-05-13 2021d133 KCor: No noticeable coronal activity. Small, faint coronal cavity in the NE. Coronal cavity in the SE. Jet/outflow in the NW at about 1805-1830UT. 2021-05-14 2021d134 KCor: No noticeable coronal activity. Faint coronal cavity in the SE. 2021-05-15 2021d135 KCor: Active prominence or partial prominence eruption in progress in the NW at about 1740-1815UT. Small coronal cavity with small bright prominence in the SE. 2021-05-16 2021d136 KCor: No noticeable coronal activity. Small fuzzy coronal cavity in the SE. 2021-05-17 2021d137 No observations at MLSO today. Sky too bright. 2021-05-18 2021d1378 No observations at MLSO today. Hazy. UCoMP work. 2021-05-19 2021d139 No observations at MLSO today. Hazy. UCoMP work. 2021-05-20 2021d1410 KCor: No noticeable coronal activity. 2021-05-21 2021d141 No observations at MLSO today. Cloudy 2021-05-22 2021d142 No observations at MLSO today. Cloudy 2021-05-23 2021d143 No observations at MLSO today. Cloudy 2021-05-24 2021d1414 KCor: No noticeable coronal activity. Very dark coronal cavity in the NE. Very dark coronal cavity in the SE. 2021-05-25 2021d1415 KCor: Large eruptive prominence in the W-SW, in progress at the beginning of the observing day with materials moving along an arched trajectory ~1707-2000UT. 2021-05-26 2021d1416 KCor: No noticeable coronal activity. Dark coronal cavity in the NE. 2021-05-27 2021d147 No observations at MLSO today. Cirrus. 2021-05-28 2021d148 KCor: No noticeable coronal activity. Possible pseudo-streamer ion the SW. 2021-05-29 2021d149 No observations at MLSO today. Cirrus. 2021-05-30 2021d150 No observations at MLSO today. Cirrus. 2021-05-31 2021d151 KCor: No noticeable coronal activity. Coronal cavity in the NW. 2021-06-01 2021d152 KCor: No noticeable coronal activity. Short observing day. Large, dark coronal cavity in the NW. 2021-06-02 2021d153 KCor: No noticeable coronal activity. Short observing day. Coronal cavity in the NE with small prominence. Coronal cavity in the NW. 2021-06-03 2021d154 KCor: No noticeable coronal activity. Coronal cavity in the NW. 2021-06-04 2021d155 KCor: CME in progress on the the W limb, ~1655-2240UT, prominence with faint cavity moving outward, no clear front. Large coronal cavity in the NE. Small coronal cavity in the NW with small bright prominence. 2021-06-05 2021d156 KCor: Faint CME with bright front in the SE best noticeable in the difference movies, at about 1928-2008UT Small coronal cavity in the NE. 2021-06-06 2021d157 KCor: Faint eruption/CME in progress in the W-NW, moves equatorward, appears as a large relatively bright loop moving outward, ~1657-1900UT. Small, dark coronal cavity in the NE with small bright prominence. 2021-06-07 2021d158 KCor: Outflow in dark region in the W-NW next to an AR. Small coronal cavities in the NE and SW. 2021-06-08 2021d159 KCor: Dark coronal cavity in the NE. Small bright prominence slowly rises above the occulter, this appears to be the beginning of a prominence/cavity eruption that will take place after the end of the observing day Coronal cavity in the SW Fast outflow in the NW noticeable at about 1946-2002UT 2021-06-09 2021d160 KCor: CME in progress in the NE at about 1651-1928UT, appears as a dark, drop-shaped coronal cavity moving outward. Dark coronal cavity in the SW CME/jet-like eruption from the ARs in the NW at about 1920-2055UT, a possible third CME is visible at 2130-2207UT and appears as a faint loop moving outward from the same ARs area. 2021-06-10 2021d161 KCor: Fast 3-part CME at the beginning of the observing day, has a bright round front and a large bright core, visible ~1746-1904UT. Coronal cavity in the SW. 2021-06-11 2021d162 KCor: No noticeable coronal activity. Coronal cavity in the SE. 2021-06-12 2021d163 KCor: Active, possibly eruptive, prominence in the N-NE early in the observing day, faint event. 2021-06-13 2021d164 KCor: Possible faint outflow in the E at the beginning of the observing day 2021-06-14 2021d165 KCor: Very dark coronal cavity with very bright prominence in the NE. Fainter coronal cavity in the SE 2021-06-15 2021d166 No observations at MLSO today. Sky completely overcast. 2021-06-16 2021d167 No observations at MLSO today. Cirrus. 2021-06-17 020d168 No observations at MLSO today. Cirrus. 2021-06-18 2021d169 KCor: Small, dark coronal cavity in the SE. Fainter, large coronal cavity in the NW. 2021-06-19 2021d170 No observations at MLSO today. Clouds and fog. 2021-06-20 2021d171 KCor: Strong surging noticeable in the E-NE from the AR behind the limb, there is a possible eruption that appears as a loop moving outward and southward at about PA 90. 2021-06-21 2021d172 KCor: No noticeable coronal activity. Dark, coronal cavity in the NW. 2021-06-22 2021d173 KCor: No noticeable coronal activity. Dark coronal cavity in the NW. 2021-06-23 2021d174 KCor: No noticeable coronal activity. Coronal cavities in the NE, SE, and NW. 2021-06-24 2021d175 KCor: Faint outward loop motion in the NW at about 1713-1733UT Coronal cavity in the NE with small bright prominence. Coronal cavity in the SE. 2021-06-25 2021d176 KCor: Slow CME in progress in the SW at about 2017-0145UT, appears as a dark drop-shaped cavity with a bright prominence moving outward. 2021-06-26 2021d177 KCor: Slow CME in the W-NW at about 2132-0210UT, appears as a dark, drop-shaped cavity moving outward and equatorward, originates from the AR behind the limb in the W-NW. Coronal cavity in the SW. 2021-06-27 2021d178 KCor: No noticeable coronal activity. Coronal cavity in the SW. 2021-06-28 2021d179 KCor: Fast CME in the NW at ~1918-2010UT, the bright prominence core is the more noticeable CME part. This seems to originate from 2021-06-29 2021d180 KCor: No noticeable coronal activity. Prominence/cavity system in the NE. 2021-06-30 2021d181 KCor: No noticeable coronal activity. Prominence/cavity system in the NE appears to slowly rise. 2021-07-01 2021d182 KCor: Slow prominence eruption in progress in the NE. Very faint CME in the W-SW, also noticeable in SDO. 2021-07-02 2021d183 KCor: Possible faint CME in the W but very bad pointing possibly because of high wind. 2021-07-03 2021d184 KCor: Jet-like eruption in the W-NW, moves strongly equatorward at about 1704-1900UT, seemsōy to originate from the AR near the limb. 2021-07-04 2021d185 KCor: CME in the W-NW at about 2141-0028UT, dark cavity with bright core moving outward, no very defined front, originates from the AR at the limb 2021-07-05 2021d186 KCor: CME with round front in the W-NW at the beginning of the observing day at about 1705-1801UT. Apparent pseudo-streamer in the SW. 2021-07-06 2021d187 KCor: No noticeable coronal activity. Coronal cavity/prominence system in the NE. Pseudo-streamer with two dark coronal cavities in the SW. 2021-07-07 2021d188 KCor: No noticeable coronal activity. Coronal cavity/prominence system in the NE, dark cavity. 2021-07-08 2021d189 KCor: Dark coronal cavity with prominence in the NE. Dark coronal cavity in the SW. 2021-07-09 2021d190 KCor: Dark coronal cavity in the SE. balloon-shaped CME in the NW in progress at the beginning of the observing day, visible at ~1723-1814UT has a round, very bright front. 2021-07-10 2021d191 KCor: No noticeable activity. Short observing day. 2021-07-11 2021d192 No observations at MLSO today. Cloudy. 2021-07-12 2021d193 No observations at MLSO today. Dense clouds. 2021-07-13 2021d194 KCor: Dark coronal cavity in the NE. 2021-07-14 2021d195 KCor: Possible pseudo-streamer in the SW. Prominence/coronal cavity system in the NW. 2021-07-15 2021d196 KCor: Coronal cavity in the NW. Jet in the NW at ~1740-1812UT Wide CME centered in the SE at 2110-2344UT, the bright prominence core is visible all the way to the edge of the fov, corresponds to a halo CME in LASCO, originates in the far side, second large halo CME in three days. 2021-07-16 2021d197 KCor: Large, dark coronal cavity in the NW with small prominence. 2021-07-17 2021d198 No observations at MLSO today. Cirrus. 2021-07-18 2021d199 KCor: No noticeable coronal activity. 2021-07-19 2021d200 KCor: CME in progress in the E, visible at ~2022-2122UT, appears as a dark bubble-shaped cavity moving outward. 2021-07-20 2021d201 KCor: Large, dark coronal cavity in the SE. 2021-07-21 2021d202 No observations at MLSO today. Cirrus. 2021-07-22 2021d203 KCor: Large coronal cavity in the SE with substructure. Large and fairly dark coronal cavity in the SW. Dark coronal cavity in the NW. CME in progress in the E-SE, appears as a dark bubble-shaped cavity moving outward, fuzzy front, visible at ~1800-2038UT, originates from AR near the limb. Possible CME in the W-SW at~0200-0250UT, narrow outflow 2021-07-23 2021d204 KCor: Two large, dark coronal cavities in the SE, the most equatorward appears to be erupting. Large, dark coronal cavity in the SW. Small dark outflow in the AR in the NW noticeable at ~1800-1845UT. Outward motion/possible eruption in the E at about 1930-2005UT 2021-07-24 2021d205 KCor: No noticeable coronal activity. Short observing day. Small coronal cavity in the NE. Coronal cavities in the SE. Dark coronal cavity in the SW. 2021-07-25 2021d206 KCor: No noticeable coronal activity. Short observing day. Two coronal cavities in the SW, possible pseudo-streamer. 2021-07-26 2021d207 No observations at MLSO today. Clouds and then rain. 2021-07-27 2021d208 KCor: No noticeable coronal activity. Short observing day. Coronal cavity in the NW with tall bright prominence. 2021-07-28 2021d209 No good observations at MLSO today. Sky too bright. 2021-07-29 2021d210 No observations at MLSO today. Overcast. 2021-07-30 2021d211 KCor: Slow prominence eruption in progress in the E-NE. Small, dark coronal cavity in the SW. 2021-07-31 2021d212 KCor: Bad pointing. Possible faint CME in progress in the SW at the beginning of the observing day, noticeable in the difference movie at about 1710-1810UT. 2021-08-01 2021d213 KCor: Some activity within the bright AR at the W-NW limb. 2021-08-02 2021d214 KCor: No noticeable coronal activity. 2021-08-03 2021d215 KCor: No noticeable coronal activity. 2021-08-04 2021d216 KCor: No noticeable coronal activity. Small, dark coronal cavity in the SW. 2021-08-05 2021d217 KCor: No noticeable coronal activity. Small, dark coronal cavity in the SW. 2021-08-06 2021d218 KCor: Small coronal cavity in the SE. Coronal cavity in the SW. Eruption in the W-SW from the AR at the limb, possible CME. 2021-08-07 2021d219 KCor: No noticeable coronal activity. Small coronal cavity in the SE. Coronal cavity in the SW. 2021-08-08 2021d220 KCor: No noticeable coronal activity. Small coronal cavity in the NW. 2021-08-09 2021d221 KCor: Narrow jet in the N-NE at abot 1800-1815UT. Tall active prominence/bright loop in the NE. Bright materials move along an arched trajectory. Small coronal cavity in the NW. 2021-08-10 2021d222 KCor: No noticeable coronal activity. Large, tall coronal cavity in the NE 2021-08-11 2021d223 No observations at MLSO today. 2021-08-12 2021d224 KCor: Jet or narrow outflow in the E-NE early in the observing day. Small coronal cavity in the NW. 2021-08-13 2021d225 No observations at MLSO today. Sky too bright. 2021-08-14 2021d226 KCor: Small bright prominence on the NE limb. 2021-08-15 2021d227 KCor: Large, bright prominence with surrounding dark coronal cavity on the NE limb. Eruption in the W-SW at about 1750-1810UT best seen in difference movie. 2021-08-16 2021d228 KCor: No noticeable coronal activity. Large, tall coronal cavity with large bright prominence in the NE. 2021-08-17 2021d229 KCor: No noticeable coronal activity. Large, tall but fuzzy coronal cavity with large, bright prominence in the NE 2021-08-18 2021d230 KCor: No noticeable coronal activity. Tall bright prominence in the SW in the shape of half-arch 2021-08-19 2021d231 KCor: Relatively faint CME with round front in the E-NE at about 2230-2330UT. 2021-08-20 2021d232 KCor: No noticeable coronal activity. Two large ARs in the E-NE and W-NW. Very large coronal cavity in the SE. 2021-08-21 2021d233 KCor: Coronal cavity in the NE with small bright prominence. Very large coronal cavity in the SE. The AR in the NW is very active. 2021-08-22 2021d234 KCor: No noticeable coronal activity. Dark coronal cavity in the NE with small bright prominence. Very large coronal cavity in the SE. Very large coronal cavity in the NW. 2021-08-23 2021d235 KCor: No noticeable coronal activity. Fuzzy coronal cavity in the NE with small bright prominence. Very large coronal cavity in the SE. Very large and very dark coronal cavity in the NW. 2021-08-24 2021d236 KCor: No noticeable coronal activity. Very dark coronal cavity in the SE. Very large and dark coronal cavity in the NW. 2021-08-25 2021d237 KCor: CME in the SE in progress at the beginning of the observing day, visible ~1712-2000UT, appears as a dark ballon-shaped cavity with bright core, no clearly defined front. Dark coronal cavity in the S-SE. Very large coronal cavity in the NW. 2021-08-26 2021d238 KCor: Very faint CME in the E-NE only noticeable in the difference movies at about 1833-1920UT. Large coronal cavity in the NW. 2021-08-27 2021d239 KCor: Slow prominence/cavity eruption in progress in the SE visible at about ~1710-1827UT 2021-08-28 2021d240 KCor: Two elliptical coronal cavities in the NE, possible pseudo-streamer. CME in the SW visible at about 2057-0130UT, still in progress at the end of the observing day, appears as a dark balloon-shaped cavity with brighty prominence core, moves out and polarward. This may be a cavity eruption inside a pseudo-streamer structure, appears as a narrow CME in LASCO with no clearly defined front. 2021-08-29 2021d241 KCor: Faint coronal cavities in the NE CME in the SW at about 1956-2040UT, at about the same location of yesterday CME, seems to originate in the AR at the limb, appears as a dark, balloon-shaped cavity with a bright front, also seen in LASCO. 2021-08-30 2021d242 No observations at MLSO today. Cloudy. 2021-08-31 2021d243 No observations at MLSO today. Cirrus. 2021-09-01 2021d244 No observations at MLSO today. Cloudy. 2021-09-02 2021d245 KCor: No noticeable cortonal activity. Coronal cavity in the SE. Coronal cavities in the SW, possible pseudo-streamer. 2021-09-03 2021d246 KCor: Possible small surge or ap in the E-SE at about 1915-1940UT noticeable in the difference movie. Tall, elongated but faint coronal cavity in the SE. 2021-09-04 2021d247 KCor: No noticeable coronal activity. Active prominence in the NE. Tall, elongated coronal cavity in the SE with small prominence. Possible pseudostreamer in the SW. 2021-09-05 2021d248 KCor: No noticeable coronal activity. Active prominence in the NE. Very dark, small coronal cavity in the SE. Possible pseudostreamer in the SW. 2021-09-06 2021d249 KCor: No noticeable coronal activity. Coronal cavities in the NE, SE, and SW: Tall coronal cavity with bright cusped prominence at its base in the NE. Dark, small coronal cavity in the SE. 2021-09-07 2021d250 KCor: No noticeable coronal activity. Tall coronal cavity with small bright prominence in the NE. Coronal cavities in the SE and SW. 2021-09-08 2021d251 KCor: Tall coronal cavity in the NE. Dark coronal cavity in the SW. CME in the SW, faint amorphous outflow at about 1850-1920UT 2021-09-09 2021d252 No observations at MLSO today. Cirrus. 2021-09-10 2021d253 No observations at MLSO today. Cirrus. 2021-09-11 2021d254 KCor: Very long arched active prominence in the NE. Possible prominence eruption in the E at about 1830-1900UT. Possible faint CME in the SE noticeable at about 1920-1940UT Surge in the NW at about 1940-2012UT originates within the AR at the limb. 2021-09-12 2021d255 KCor: Coronal cavity with prominence in the NE. Jet/narrow outflow in the SW at about 1740-1800UT. 2021-09-13 2021d256 KCor: Coronal cavity in the NE. Coronal cavity in the NW. Faint outflow in the SE at about 2050-2120UT Surge/narrow outflow in the SW at about 2105-2130UT from AR near the limb. 2021-09-14 2021d257 KCor: Coronal cavity in the NE. Large coronal cavity in the NW. Faint outflow in the SE. 2021-09-15 2021d258 KCor: No noticeable coronal activity but noisy data. Coronal cavity in the NW. 2021-09-16 2021d259 No observations at MLSO today. Overcast all day. 2021-09-17 2021d260 KCor: No noticeable coronal activity. 2021-09-18 2021d261 KCor: No noticeable coronal activity. Small bright prominence in the E-SE. Faint coronal cavity in the SE. Coronal cavity in the SW under narrow streamer. 2021-09-19 2021d262 No KCor observations at MLSO today. Some UCoMP data. 2021-09-20 2021d263 KCor: No noticeable coronal activity. Fuzzy coronal cavity in the SE. Dark, large coronal cavity in the SW. Dark coronal cavity in the NW. 2021-09-21 2021d264 KCor: No noticeable coronal activity. Large coronal cavity in the SE. Faint coronal cavity in the SW. Dark coronal cavity in the NW with bright prominence. 2021-09-22 2021d265 KCor: No noticeable coronal activity. Fuzzy coronal cavity in the SE. Very dark coronal cavity in the NW with large bright prominence 2021-09-23 2021d266 KCor: Flow of bright material that appears to be a huge active prominence in the W at about 1827-2004UT, bright material is seen moving along an arched trajectory, no material appears to escape. Very dark coronal cavity in the NW. 2021-09-24 2021d267 KCor: Surge or narrow CME in the W-SW at about 2330-0041UT, originates within AR near the limb. Narrow jet in the SW at about 2103-2300UT from the AR near the limb. Coronal cavity in the W. 2021-09-25 2021d268 No observations at MLSO today. Windy. 2021-09-26 2021d269 KCor: Possible narrow CME or outflow in the E-NE at about 2000-2200UT, originates in AR at the limb not visible in LASCO. 2021-09-27 2021d270 KCor: No noticeable coronal activity. Coronal cavity in the NE with small bright prominence. Coronal cavity in the NW. 2021-09-28 2021d271 KCor: Narrow CME in the SW at 2315-0005UT, also seen in LASCO, correspond to a surge from the AR near the limb Faint coronal cavity in the NE. Coronal cavity in the NW. 2021-09-29 2021d272 KCor: Faint CME with bright front in the W-SW visible at about 1805-1830UT Small, very dark, coronal cavity in the NW. 2021-09-30 2021d273 KCor: No noticeable coronal activity. 2021-10-01 2021d274 KCor: No noticeable coronal activity. 2021-10-02 2021d275 No observations at MLSO today. 2021-10-03 2021d276 KCor: No noticeable coronal activity. Coronal cavity in the NE. 2021-10-04 2021d277 KCor: No noticeable coronal activity. Fuzzy coronal cavity in the NE with prominence. Tall, elongated coronal cavity in the SE. 2021-10-05 2021d278 KCor: No noticeable coronal activity. Fuzzy, tall coronal cavity in the NE with prominence. Dark coronal cavity in the SE. Possible small coronal cavity in the SW. Pseudo-streamer in the NW. 2021-10-06 2021d279 No observations at MLSO today. Cloudy. 2021-10-07 2021d280 KCor: No noticeable coronal activity. Dark coronal cavity in the SE. Coronal cavity in the SW. 2021-10-08 2021d281 No observations at MLSO today. Cirrus. 2021-10-09 2021d282 KCor: Balloon-shaped, large CME in the W-NW at about 2030-0125UT, moves equatorward, outflow persists until late in the observing day it has complex sub-structure, it almost looks like two eruptions very close in time in KCor but this is not supported by SDO, originates in the AR at the limb, corresponds to a very bright CME in LASCO. 2021-10-10 2021d283 KCor: Classic three-part, balloon-shaped CME in the NW at PA 300 with bright round front and bright prominence core, visible at about 2235-0150UT, from the same AR that erupted yesterday and is just behind the solar limb, seen by LASCO. Dark coronal cavity in the NW. 2021-10-11 2021d284 KCor: No noticeable coronal activity. Large coronal cavity in the NW. 2021-10-12 2021d285 No observations at MLSO today. Cloudy. 2021-10-13 2021d286 No observations at MLSO today. Cloudy. 2021-10-14 2021d287 No observations at MLSO today. Hazy. 2021-10-15 2021d288 KCor: Small coronal cavity in the NE. Quadrupolar corona. CME in the NW at about 1926-1948UT with round bright front, no clear CME in LASCO but there is a surge in AR at the W-NW limb is seen in SDO and is shortly followed by a puff of material just N of it, at about the same location of the KCor outflow, that appears originate from behind the limb 2021-10-16 2021d289 KCor: No noticeable coronal activity. Faint coronal cavity in the NE. Coronal cavity in the SW with small bright prominence. Possible outflow in the W-SW at about 1835-1850 noticeable in the difference movie 2021-10-17 2021d290 No observations at MLSO today. Cirrus 2021-10-18 2021d291 KCor: No noticeable coronal activity. Faint coronal cavity in the NE. Dark coronal cavity in the SW. Very Dark coronal cavity in the NW with prominence, classic prominence/cavity/streamer structure. 2021-10-19 2021d292 KCor: No noticeable coronal activity. Dark, small, roundish coronal cavity in the E-NE. Relatively faint coronal cavity in the SE. Dark, large coronal cavity in the SW. Dark coronal cavity in the NW with prominence, classic prominence/cavity/streamer structure. 2021-10-20 2021d293 KCor: No noticeable coronal activity. Dark coronal cavity in the E-NE. Coronal cavity in the SE. Dark, large coronal cavity in the SW. Low (likely mostly behind the limb) coronal cavity in the NW 2021-10-21 2021d294 KCor: No noticeable coronal activity. Coronal cavities in the S-SW and S-SE, polar crown. Bright AR in the E-SE. 2021-10-22 2021d295 KCor: CME in progress in the NE with bright thin, round front, visible at about 1754-1820UT. CME in the E-SE with round front at about 1820-1910UT, the AR area next the limb where the CME originates continues to show some motion until about 2110UT and later, toward the end of the observing day another AR appears above the occulter in the same area. A third wide CME in the E-NE at 2105-2140UT Coronal cavity in the SE. 2021-10-23 2021d296 KCor: No noticeable coronal activity. Coronal cavities in the SE and NW. 2021-10-24 2021d297 No observations at MLSO today. Cirrus 2021-10-25 2021d298 KCor: Fainter coronal cavity in the NE. Tall coronal cavity with very bright prominence in the NW and dark "horns" Wide CME in the E-NE at 1950-2132UT, originates from the AR at the limb, there is a C8 flare there was a lot of surging after the CME and also very tall and bright post-eruption loops this AR activity seems to correspond to the brightening seen in KCor after the CME Strong surging is the AR following the flare is seen in KCor especially around 2202-0110UT. 2021-10-26 2021d299 KCor: Coronal cavity with bright active prominence in the NE. Tall coronal cavity in the NW with very bright prominence and dark tall "horns" Surging and flaring in the E-NE, in the AR that flared yesterday and is still very active today. Faint CME with round front in the SE at about 1900-2000UT, best seen in the difference movie, also seen in LASCO and SDO, correspond to a large prominence eruption, originates from behind the limb Possible pseudo-streamer in the SE, but KCor sees only the stalk. 2021-10-27 2021d300 KCor: No noticeable coronal activity. Dark coronal cavity with bright prominence in the NE. Dark coronal cavity with bright prominence in the NW, with "horns" 2021-10-28 2021d301 No observations at MLSO today. Cirrus 2021-10-29 2021d302 No observations at MLSO today. Overcast all day. 2021-10-30 2021d303 KCor: No noticeable coronal activity. Tall prominence in the NE. 2021-10-31 2021d304 KCor: Very tall prominence/cavity system in the NE, possibly pre-eruptive. Very wide CME with wide front in the SW at about 0112-0203UT, originates in the large AR complex in the SW near the limb, large half halo CME seen in LASCO. 2021-11-01 2021d305 KCor: Very tall prominence/cavity system in the NE, possibly pre-eruptive. Eruption in the SW at the same AR that flared yesterday, the CME is visible early in the day, at about 1741-1815UT Small, dark coronal cavity in the W-SW. 2021-11-02 2021d306 KCor: CME in the SE at about 2130-2353UT with bright round front and dark cavity originates in the AR behind the limb, visible in SDO and LASCO. Coronal cavity in the S-SW. Small coronal cavity in the W-NW 2021-11-03 2021d307 KCor: Faint narrow jet at the beginning of the day ~1910-1930UT in the SE followed by a small CME in the SE at about 2136-2312UT with round front and dark cavity, originates in the same AR that erupted yesterday, still behind the limb "double" CME in the W-SW at about 2050-2216UT with bright round front, it has two drop-shaped dark cavities, is almost seems a sympathetic CME with two twin filaments erupting at the same time, originates in the large AR complex at the limb. Dark coronal cavity in the NE. Very large, dark coronal cavity in the SW. 2021-11-04 2021d308 KCor: No noticeable coronal activity. Large coronal cavity in the SW. 2021-11-05 2021d309 KCor: No noticeable coronal activity. Bright sky. Only a few good images Nice example of prominence/coronal cavity/streamer in the SW. 2021-11-06 2021d310 KCor: Narrow outflow in the NE at about 0048-0108UT, also seen in SDO. Nice example of bright prominence/coronal cavity/streamer in the SW. Loop motion in the AR complex just behind the limb in the W-SW. 2021-11-07 2021d311 KCor: No noticeable activity today. Bad fringing today. Nice prominence/cavity/streamer in the SW 2021-11-08 2021d312 KCor: No noticeable activity today. Coronal cavity with bright prominence in the SW. Active prominence in the NW. 2021-11-09 2021d313 KCor: No noticeable activity today. 2021-11-10 2021d314 KCor: No noticeable activity today. Large coronal cavity in the SW. 2021-11-11 2021d315 KCor: No noticeable activity today. Possible loop motion in AR on the W-NW limb. 2021-11-12 2021d316 No observations at MLSO today. Cloudy. 2021-11-13 2021d317 No observations at MLSO today. Cirrus. 2021-11-14 2021d318 No observations at MLSO today. Cloudy. 2021-11-15 2021d319 No observations at MLSO today. Overcast. 2021-11-16 2021d320 KCor: No noticeable activity today. Dark coronal cavity with bright small prominence. 2021-11-17 2021d321 No observations at MLSO today. Cirrus. 2021-11-18 2021d322 KCor: No noticeable activity today. Large pseudostreaner in the SE. 2021-11-19 2021d323 KCor: No noticeable activity today. Large pseudostreaner/double streamer in the SE. 2021-11-20 2021d324 KCor: No noticeable activity today. Coronal cavities in the SE and SW. 2021-11-21 2021d325 No observations at MLSO today. Cirrus. 2021-11-22 2021d326 KCor: Faint prominence eruption in the SE in progress at the beginning of the observing day ~1938-2351UT 2021-11-23 2021d327 KCor: No noticeable activity today. Coronal cavity in the SE with bright prominence. Small coronal cavity in the NW with bright prominence. 2021-11-24 2021d328 KCor: No noticeable activity today. Dark coronal cavity in the NE. Dark coronal cavity in the NW. 2021-11-25 2021d329 KCor: No noticeable activity today. Dark coronal cavity in the NE. Coronal cavity in the NW. 2021-11-26 2021d330 No observations at MLSO today. Overcast. 2021-11-27 2021d331 KCor: No noticeable activity today. Dark coronal cavity in the NE. 2021-11-28 2021d332 KCor: Very faint outflow in the E at the beginning of the day, also seen in SDO, appears to originate from AR at the limb. Narrow outflow in the W around 2030-2100UT, it seems associated to a surge from the AR at the limb. Dark coronal cavity in the NE Dark coronal cavity in the SE. 2021-11-29 2021d333 KCor: Dark coronal cavity in the NE Small coronal cavity in the SE. Drop-shaped coronal cavity in the NW. 2021-11-30 2021d334 No observations at MLSO today. Cloudy 2021-12-01 2021d335 No observations at MLSO today. Cloudy 2021-12-02 2021d336 KCor: No noticeable coronal activity. Coronal cavity in the NE. Dark, large coronal cavity in the SW. 2021-12-03 to 2021-12-07 Bad weather. Snow. lost Power. No data. 2021-12-08 2021d342 KCor: No noticeable coronal activity. Short observing day. Faint coronal cavity in the NE. 2021-12-11 2021d345 KCor: Faint outflow in the W-SW, appears as a small puff of material at the beginning of the observing day. Coronal cavity in the NE. Dark coronal cavity with bright prominence in the NW. 2021-12-12 2021d346 KCor: Two faint coronal cavities in the NE and E-NE, possible pseudostreamer or double streamer Very large, dark coronal cavity with small bright prominence in the NW. Faint CME with bright front in the SE at about 2100-2204UT seems to originate in AR at the limb. 2021-12-13 2021d347 KCor: No noticeable coronal activity. Large coronal cavity in the NW. 2021-12-14 2021d348 KCor: No noticeable coronal activity. 2021-12-15 2021d349 KCor: No noticeable coronal activity. 2021-12-16 2021d350 KCor: No noticeable coronal activity. Coronal cavity in the SE. 2021-12-17 2021d351 KCor: No noticeable coronal activity. Coronal cavities in the SE and SW. 2021-12-18 2021d352 KCor: No noticeable coronal activity. Large coronal cavity in the SE. Small, dark coronal cavity in the SW. 2021-12-24 2021d358 KCor: Very tall, elongated, dark coronal cavity in the NE. Small, very dark coronal cavity with small bright prominence in the NW. Outflow, surging, or possible CME in the SW in the area of the AR near the limb. 2021-12-25 2021d359 KCor: Amorphous outflow in the W-SW in the area of the AR near the limb, also narrow outflow in the SW, just S of the AR, starting at about 2010UT. Faint, large coronal cavities in the NE and NW. 2021-12-26 2021d360 KCor: No noticeable coronal activity. Faint coronal cavity in the NE.