***********************Mauna Loa Solar Observatory*********************** OBSERVING HOURS These are defined as the time between the first and the last useful coronal scans made with the MkIII K-coronameter. This instrument levies very stringent requirements on the condition of the sky so is the most sensitive to the weather. Unless otherwise stated, it may be assumed that the H alpha observations made with the prominence monitor will be available for the same hours as the coronal data, or perhaps even longer. Note that the MLSO oberving day begins about 17:00 UT and can end as late as 03:30 UT the "next" day. Typical observing times are 17:30 UT to 23:00 UT. The format of this file is undergoing evaluation and may not be final FOR YEAR 1994: Day of Begin End Year (UT) (UT) 1 ----- ----- 2 ----- ----- 3 18.28 22.33 4 18.05 21.59 01 brushed on mk3 5 18.07 22.31 6 17.58 22.02 7 18.12 22.24 8 18.04 21.47 9 ----- ----- 10 18.03 22.04 Pmon pre-filter replaced. 11 18.14 22.14 CME at PA 275 12 18.07 21.51 New tilt plates installed. 13 18.16 22.31 Cavity at PA 90 14 18.03 21.58 15 17.59 22.09 16 17.53 22.04 Possible CME at PA 75-90 17 18.13 22.21 18 17.59 21.59 19 18.09 22.26 20 ----- ----- 21 ----- ----- 22 ----- ----- 23 ----- ----- 24 ----- ----- 25 ----- ----- 26 18.27 20.23 27 18.18 22.25 28 18.24 22.23 Active region at PA 282 surged from 1950-2021 CME pa 290 from ~ 19:48- 20:04 UT 29 18.11 22.26 CME at PA 270, begining ~18.35 30 17.53 22.00 31 18.08 22.19 32 18.00 22.02 33 18.14 22.53 34 17.52 20.45 35 18.47 21.45 36 ----- ----- 37 ----- ----- 38 17.50 22.08 39 17.56 20.16 40 ----- ----- 41 ----- ----- 42 18.00 19.33 Pmon film system decommissioned. 43 ----- ----- 44 ----- ----- 45 ----- ----- 46 ----- ----- 47 ----- ----- 48 ----- ----- 49 ----- ----- 50 18.34 22.09 51 17.29 01.55 Time runs into the next day. (Times are guesses as they were recorded incorrectly!!! ARL DMC 3/10/94) 52 18.19 21.56 53 18.35 22.58 54 ----- ----- 55 19.18 22.59 56 18.16 21.08 57 18.06 22.48 58 18.34 22.06 59 18.03 22.21 60 17.40 22.00 61 17.45 22.15 62 17.36 21.58 63 17.42 22.25 64 17.41 21.54 65 18.53 21.41 66 17.58 22.01 67 17.49 21.50 68 17.42 22.00 69 17.47 21.43 70 17.32 21.59 71 ----- ----- 72 ----- ----- 73 17.42 21.38 74 17.47 21.58 75 ----- ----- 76 ----- ----- 77 ----- ----- 78 ----- ----- 79 17.48 21.41 80 ----- ----- 81 ----- ----- 82 ----- ----- 83 ----- ----- 84 ----- ----- 85 17.50 21.42 86 17.35 21.31 87 17.51 21.40 88 17.28 21.59 89 17.42 21.41 90 17.47 22.00 91 17.35 21.46 92 17.16 21.57 93 17.25 21.33 94 17.22 21.07 95 17.29 21.47 96 17.15 19.19 97 17.15 22.46 98 17.24 22.02 99 17.36 20.50 100 ----- ----- 101 ----- ----- 102 ----- ----- 103 17.25 21.43 104 17.10 21.57 105 ----- ----- 106 ----- ----- 107 17.38 22.06 108 17.19 22.03 109 19.34 21.19 110 17.19 22.00 111 17.31 22.50 112 17.26 21.44 113 17.30 21.47 114 17.18 21.54 115 17.38 21.55 116 17.11 20.15 117 17.41 19.41 118 ----- ----- 119 ----- ----- 120 17.25 21.13 121 17.06 21.22 CME observed at PA 275 from 17:57 to 18:47 122 17.06 21.32 123 ----- ----- 124 17.21 21.50 125 17.03 22.03 126 17.02 22.00 127 ----- ----- 128 ----- ----- 129 17.10 21.35 130 17.05 22.02 EPL at PA 93-115 from 2030 to 2130 UT 131 17.13 21.30 132 17.01 21.03 133 ----- ----- 134 17.01 21.45 135 ----- ----- 136 ----- ----- 137 17.15 21.46 138 ----- ----- 139 17.18 20.07 140 ----- ----- 141 ----- ----- 142 ----- ----- 143 ----- ----- 144 ----- ----- 145 ----- ----- 146 ----- ----- 147 ----- ----- 148 ----- ----- 149 ----- ----- 150 17.20 00.08 151 17.17 22.43 152 ----- ----- 153 17.17 23.50 154 ----- ----- 155 17.27 00:53 156 ----- ----- 157 17.34 22.15 158 ----- ----- 159 17.22 23.49 160 ----- ----- 161 18.34 22.09 162 ----- ----- 163 17.15 22.26 164 17.07 22.01 165 17.09 22.28 166 17.04 19.39 167 17.19 22.42 168 16.57 19.48 169 ----- ----- 170 17.00 19.07 171 17.14 21.59 172 16.57 22.01 173 17.47 21.52 174 16.53 21.57 175 ----- ----- 176 19.57 21.36 177 ----- ----- 178 16.57 19.26 Data taken in cirrus. 179 17.11 21.31 180 17.06 19.31 Data taken in broken cirrus. 181 17.32 20.16 182 16.59 18.09 183 17.16 19.33 184 16.56 21.16 Guider failure. Early data compromised. 185 17.21 22.01 Data taken in cirrus. 186 17.01 22.03 Data taken in thin cirrus. 187 17.14 21.40 188 ----- ----- 189 ----- ----- 190 ----- ----- 191 17.07 21.57 192 17.04 21.24 193 ----- ----- 194 17.21 21.56 195 17.12 21.27 196 ----- ----- 197 17.22 21.57 198 17.04 22.02 199 17.15 21.36 200 17.06 22.29 Coronal depletion PA 200-213, 1844-1913 and PA 280 at 20:55 201 ----- ----- Hurricane Emelia producing thick overcast. 202 ----- ----- Still under effects of hurricane. 203 ----- ----- Still under effects of hurricane. 204 17.05 22.01 205 ----- ----- 206 17.10 21.14 207 17.11 21.58 208 17.00 21.52 209 17.18 22.05 210 19.39 20.14 Cirrus impacts data. 211 17.19 22.01 212 16.59 21.46 213 ----- ----- 214 ----- ----- 215 16.48 21.05 216 16.31 03.27 (Data continued to doy 217 03.27) 217 16.42 01.19 (Data contunued to doy 218 01.19) 218 17.04 19.16 and 00.02 01.11 on doy 219 (Dpmon focus work begun) 219 16.48 22.07 220 16.46 04.44 (Data continued to doy 221 04.44) 221 17.18 23.54 222 16.46 00.15 (Data continued to doy 223 00.15) 223 ----- ----- 224 ----- ----- 225 16.43 19.55 226 16.38 22.32 227 16.38 22.15 228 16.42 22.31 229 17.27 22.12 230 17.05 18.43 Data quaility impacted by clouds. 231 16.56 22.19 232 ----- ----- 233 16.46 01.09 (Data continued to DOY 234 01.09) 234 17.35 19.38 Short day due to clouds from hurricane john 235 ----- ----- 236 ----- ----- 237 17.18 18.42 238 ----- ----- 239 ----- ----- 240 ----- ----- 241 ----- ----- 242 16.40 22.02 243 ----- ----- 244 16.55 20.23 245 ----- ----- 246 ----- ----- 247 ----- ----- 248 ----- ----- 249 17.29 21.42 Data are of poor quality due to clouds and fog. 250 20.13 03.05 Data are of poor quality due to cirrus. 251 17.14 03.27 Data is poor after 00.00 UT 252 16.58 01.01 Data compromised by clouds... some good data. 253 ----- ----- 254 ----- ----- 255 17.01 21.35 256 16.48 19.23 257 19.54 20.51 Spartan observations at this time as well. 258 16.56 20.31 259 20.05 21.59 260 16.52 21.11 261 16.54 21.00 262 ----- ----- 263 ----- ----- 264 23.26 03.33 Data marred by cirrus. A few good images. 265 16.58 03.27 266 17.06 23.18 267 16.48 03.29 Tilt plates inspected, dust found in tlescope 268 16.50 22.09 269 17.06 04.10 270 17.01 23.28 271 ----- ----- 272 ----- ----- 273 17.21 21.06 274 ----- ----- 275 16.51 23.47 276 17.05 00.29 277 17.11 00.24 278 17.04 03.08 279 16.59 03.26 280 17.08 23.51 281 17:15 21:41 282 17:00 01:16 EPL 102-108 between 0:30-1:15UT to 1.3rv. 283 17.05 03.56 284 17.05 00.43 Small surge at 2300 ut, PA=85, RV=1.1 285 01.00 03.25 Some cirrus entire day. 286 17.02 03.25 287 18.23 23.17 288 17.06 23.17 289 17.09 20.35 290 17.55 19.09 Tilt plates reinspected. Cals must be done at same RA 291 17.58 21.06 292 ----- ----- 293 ----- ----- 294 ----- ----- 295 16.59 22.01 296 16.56 00.34 297 17.11 03.40 298 17:15 01:05 299 17:08 17:30 300 17:11 00:32 301 17:05 22:56 302 ----- ----- 303 ----- ----- 304 20:41 21:41 305 17:09 00:59 306 17:10 03:31 307 17:20 03:22 CME at PA 250-255 beginning near 21:15 UT. 308 ----- ----- 309 ----- ----- 310 17:30 21:42 311 17:10 21:25 312 17:14 23:45 313 17:29 03:27 314 ----- ----- 315 ----- ----- 316 ----- ----- 317 ----- ----- 318 17:23 20:11 319 18:39 21:06 320 ----- ----- 321 ----- ----- 322 17:30 23:14 323 17:17 01:41 324 17:12 01:11 325 17:25 03:23 326 17:23 01:21 327 17:23 00:37 328 18:02 21:38 329 18:12 21:44 330 17:34 01:29 331 ----- ----- 332 17:27 21:58 333 17:28 22:28 334 17.34 22.07 335 17.34 22.26 Channel 1 detector alignment begun. 336 17.33 23.45 337 17.34 03.22 338 17.19 01.01 339 17.33 03.04 Channel 1 detector alignment complete. 340 ----- ----- 341 00.15 03.21 342 17.33 03.16 343 17.41 23.15 344 19.38 03.13 345 17.22 01.02 346 17.41 03.24 347 17.39 23.59 dPmon inoperational for portion of day due to broken wires. surging prominence at PA 300, 2210 prominence seen in MK3 data from 17:42-21:30 (fades later) 348 17.36 23.09 Channel 0 alignment work begun 349 17.36 22.01 350 17.30 23.04 351 17:27 22:59 352 17:41 21:59 353 17:39 23:04 354 17.28 22.32 Slight depletion at PA=245 at 2040. 355 17.50 22.01 356 17.50 21.59 357 17.35 22.02 358 17.37 22.57 359 ----- ----- 360 17.40 20.36 361 17.32 22.20 362 17.43 22.03 Tilt plates were noticed to have slipped. 363 ----- ----- 364 17.53 22.35 365 17.48 22.00