**********************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 1997: Day of Begin End Year (UT) (UT) 1997 1 ----- ----- 1997 2 17.52 22.10 1997 3 18.04 00.10 1997 4 20.41 21.59 1997 5 17.48 22.21 1997 6 17.45 22.46 1997 7 18.00 22.06 1997 8 17.55 20.19 some ch1 alignment work. 1997 9 17.50 22.06 1997 10 18.03 22.59 1997 11 18.00 23.19 1997 12 17.45 22.35 some ch1 alignment work. 1997 13 17.43 20.04 some ch1 alignment work. 1997 14 17.54 23.04 Prominence at PA303 lifted out to 1.15Rsun from 21.01-23.06 1997 15 17.42 22.24 ch1 work continues 1997 16 17.55 22.07 1997 17 17.54 23.12 1997 18 17.47 23.03 1997 19 17.52 22.30 1997 20 ----- ----- No obs. due to very stormy weather. 1997 21 18.18 23.04 Snow seen on Mauna Kea. 1997 22 ----- ----- Observatory door frozen shut. High winds and storms. 1997 23 17.43 22.05 1997 24 17.59 23.08 1997 25 ----- ----- 1997 26 20.29 22.06 Probably only one good image in this period. 1997 27 17.40 23.10 ch1 alignment project making good gains. 1997 28 18.13 23.14 1997 29 17.51 23.06 1997 30 17.42 22.00 1997 31 17.49 22.03 No CME associated with EPL at PA=130 from about 1800 to 2100, RV> 1.3, activity involved AP at 105 also. Prominence can be seen wiggling in mk3 data. 1997 32 17.50 22.22 1997 33 ----- ----- 1997 34 17.34 22.18 1997 35 17.33 23.03 1997 36 17.34 22.14 1997 37 17.30 23.46 EPL: PA 133, from sometime after 2023UT until 2300 UT. 1997 38 ----- ----- 1997 39 ----- ----- 1997 40 17.55 23.02 1997 41 17.34 22.06 1997 42 17.45 23.01 1997 43 17.29 22.08 1997 44 17.33 21.23 1997 45 17.29 22.58 1997 46 17.40 23.10 1997 47 17.27 23.02 1997 48 17.24 22.00 1997 49 17.46 22.03 1997 50 17.24 22.07 1997 51 ----- ----- 1997 52 17.54 22.41 1997 53 17.42 22.19 (Internet access down all day.) 1997 54 17.30 22.10 (Fixed dPmon centers) 1997 55 17.21 22.00 1997 56 17.53 20.26 Smudge on objective in north. 1997 57 ----- ----- Snow and blowing snow at the observatory. 1997 58 ----- ----- 1997 59 ----- ----- 1997 60 18.47 20.02 1997 61 17.19 21.19 1997 62 17.18 22.11 1997 63 ----- ----- 1997 64 ----- ----- 1997 65 21.29 22.32 1997 66 17.34 22.00 1997 67 17.51 22.31 1997 68 17.18 21.18 1997 69 19.44 20.19 1997 70 ----- ----- No obs. due to fog. 1997 71 17.11 21.32 1997 72 17.19 20.09 1997 73 ----- ----- 1997 74 ----- ----- 1997 75 ----- ----- 1997 76 ----- ----- 1997 77 ----- ----- 1997 78 17.15 22.11 1997 79 ----- ----- 1997 80 ----- ----- 1997 81 17.25 20.53 Problems with dPmon gain(?) sky "too dim". 1997 82 ----- ----- 1997 83 ----- ----- 1997 84 17.24 19.23 1997 85 17.16 21.30 1997 86 ----- ----- 1997 87 ----- ----- 1997 88 17.16 20.29 dPmon computer rebooted, camera offsets reloaded, images back to nromal. 1997 89 17.04 20.42 1997 90 ----- ----- 1997 91 16.58 22.08 CHIP shutter and spectrum tests. 1997 92 17.11 18.09 Most data marred by clouds. 1997 93 17.01 22.03 1997 94 17.03 22.18 1997 95 17.04 22.07 1997 96 18.03 21.32 1997 97 19.01 21.26 Data marred by cirrus and NOAA construction. SOHO observes CME at ~15:00ut (perhaps a bit earlier, ~14:12ut.) 1997 98 ----- ----- 1997 99 16.51 18.08 1997 100 16.57 19.25 1997 101 ----- ----- 1997 102 ----- ----- 1997 103 ----- ----- CHIP pre-filter flipped 1997 104 19.56 20.34 1997 105 17.37 21.43 1997 106 17.03 20.25 1997 107 16.53 22.04 CHIP pre-fitler tilt adjusted, spectrum tests run. 1997 108 17.04 22.04 CHIP pre-fitler tilt adjusted, spectrum tests run. 1997 109 16.59 22.04 1997 110 16.56 22.02 1997 111 16.59 18.17 1997 112 17.35 22.19 1997 113 ----- ----- 1997 114 17.27 20.37 1997 115 ----- ----- 1997 116 ----- ----- 1997 117 16.45 22.03 1997 118 16.49 22.03 1997 119 17.08 22.04 1997 120 16.50 22.03 11/44 Disk backup done 1997 121 16.37 20.04 Mask test taken. 1997 122 16.54 20.23 1997 123 ----- ----- 1997 124 17.36 20.59 Most early images unuseable due to clouds. 1997 125 16.49 20.06 1997 126 ----- ----- 1997 127 ----- ----- 1997 128 ----- ----- 1997 129 ----- ----- 1997 130 ----- ----- 1997 131 16.56 22.04 1997 132 16.57 21.24 Data may not be worthwhile. 1997 133 17.13 21.21 1997 134 16.35 21.48 1997 135 16.53 19.26 1997 136 16.57 19.50 1997 137 16.48 19.05 Recent haze in seeing diagnosed as "Asian Dust" 1997 138 ----- ----- 1997 139 ----- ----- 1997 140 ----- ----- 1997 141 17.29 20.41 CME observed by EIT. 1997 142 ----- ----- 1997 143 17.17 22.07 1997 144 17.28 22.49 1997 145 16.52 22.12 1997 146 16.36 22.31 Possible CME, PA 70, 1926-2130 1997 147 16.53 22.17 1997 148 16.49 21.00 1997 149 17.30 22.02 Chip tape drive broken... and fixed! 1997 150 ----- ----- 1997 151 ----- ----- 1997 152 16.53 22.20 New kii (chip) tape drive installed -- prefilter tests. 1997 153 17.31 22.06 1997 154 17.35 21.04 1997 155 ----- ----- kii (chip) tape drive belly up -- a lowL drive has been temporarily borrowed. 1997 156 16.57 22.33 EPL from 300-330 at around 2130-2230 UT. 1997 157 17.10 22.02 1997 158 16.49 22.08 1997 159 20.09 22.11 1997 160 16.48 22.06 CME/EPL PA 300-315 between 2000-2030 UT 1997 161 17.15 22.12 1997 162 18.05 22.09 1997 163 16.55 20.36 1997 164 18.08 21.35 1997 165 17.01 22.27 1997 166 16.52 22.21 1997 167 16.45 23.11 AR/EPL: 275-305 RV to 1.8 1630-2300 UT. Prominence material visible in coronal scans from after 1818 UT. 1997 168 16.59 22.10 Possible coronal depletion -- could be due to improper occulting... 1997 169 17.02 21.23 MK3 computer crashed at end of the day. 1997 170 ----- ----- MLSO internet connection is down. 1997 171 ----- ----- 1997 172 ----- ----- 1997 173 ----- ----- 1997 174 ----- ----- smudge cleaned off dPmon 01 1997 175 ----- ----- 1997 176 ----- ----- MLSO internet connection is back up. 1997 177 ----- ----- MLSO internet connection is down, back up after 1900UT. 1997 178 ----- ----- 1997 179 ----- ----- New gears installed on MK3 01 y-axis motor and trans. MLSO internet connection is down. 1997 180 ----- ----- 1997 181 ----- ----- 1997 182 ----- ----- 1997 183 ----- ----- 1997 184 ----- ----- Heavy construction at NOAA deposited dust on all MLSO optics. 1997 185 ----- ----- 1997 186 ----- ----- 1997 187 ----- ----- 1997 188 ----- ----- 11/44 repaired late in day. 1997 189 16.53 17.19 MK3 back up! 1997 190 ----- ----- 1997 191 16.48 21.16 1997 192 16.59 20.10 MLSO internet connection is finally back up. 1997 193 16.59 20.07 1997 194 16.42 21.41 1997 195 16.38 19.13 1997 196 17.06 22.20 1997 197 16.55 22.14 1997 198 16.38 22.01 CORRECT run on ch1 1997 199 17.00 21.54 1997 200 16.45 19.50 1997 201 17.37 22.07 Construction beginning for new dome. 1997 202 17.02 21.34 power glytches in morning. 1997 203 17.21 20.44 small EPL PA 310 ~17.46 1997 204 16.38 20.15 1997 205 16.34 21.08 1997 206 18.05 21.06 CME spotted at PA: 300 from 20:24-20:43 UT. CHIP data records position at 55W/15N 1997 207 16.54 19.07 1997 208 17.00 21.26 mk3 01 cleaned. All instruments affected by construction dust since DOY 201. 1997 209 16.40 21.58 1997 210 ----- ----- 1997 211 ----- ----- 1997 212 16.42 20.16 1997 213 16.59 21.44 MK3 tilt plate stop installed. 1997 214 16.51 21.21 1997 215 20.18 22.23 In patchy cirrus. 1997 216 16.37 22.11 1997 217 16.52 22.34 1997 218 16.53 21.21 1997 219 16.49 21.31 1997 220 ----- ----- 1997 221 ----- ----- 1997 222 16.51 21.53 1997 223 16.48 21.45 1997 224 17.52 22.02 1997 225 16.48 20.33 1997 226 16.59 21.15 1997 227 17.06 20.38 Intense electrical storm very late in day knocked out all instruments. Phone and network dead. 1997 228 17.04 20.58 1997 229 ----- ----- 1997 230 ----- ----- 1997 231 ----- ----- 1997 232 20.25 22.08 1997 233 ----- ----- 1997 234 16.54 22.13 1997 235 ----- ----- CHIP data only in cloudy skies. 1997 236 ----- ----- 1997 237 ----- ----- 1997 238 ----- ----- 1997 239 16.53 21.25 1997 240 ----- ----- 1997 241 17.06 22.46 1997 242 17.21 20.17 1997 243 ----- ----- 1997 244 ----- ----- 1997 245 ----- ----- 1997 246 17.04 20.34 1997 247 ----- ----- 1997 248 ----- ----- 1997 249 17.20 21.27 1997 250 16.49 22.04 Possible CME PA 290-300 between 1800-1930 UT. MK3 data shows activity in the area prior to 18:13ut. Data is then marred by clouds until 19:30. At that time activity appears to have ceased. 1997 251 16.44 21.46 1997 252 17.16 23.00 Large CME at PA: 320, from 19:07-20:26 UT. (djs) 1997 253 17.20 19.16 1997 254 ----- ----- MK3 computer and coronameter undergoing upgrade. 1997 255 ----- ----- 1997 256 ----- ----- 1997 257 ----- ----- 1997 258 ----- ----- 1997 259 ----- ----- 1997 260 ----- ----- 1997 261 ----- ----- 1997 262 ----- ----- 1997 263 ----- ----- 1997 264 ----- ----- 1997 265 ----- ----- 1997 266 ----- ----- 1997 267 ----- ----- 1997 268 ----- ----- 1997 269 17.01 03.22 J. Burkepile - multiple logs from Elmore/Koon 1997 270 16.59 21.30 J. Burkepile - multiple logs from Elmore/Koon 1997 271 16.53 19.42 1997 272 16.54 20.22 1997 273 16.57 19.24 1997 274 16.57 21.07 1997 275 16.54 22.20 1997 276 17.06 22.08 1997 277 ----- ----- 1997 278 ----- ----- 1997 279 17.37 22.03 1997 280 17.19 21.17 1997 281 17.46 20.28 1997 282 ----- ----- 1997 283 16.53 20.46 1997 284 17.00 21.11 1997 285 16.58 22.07 1997 286 ----- ----- 1997 287 16.56 22.10 1997 288 17.18 22.23 1997 289 ----- ----- 1997 290 16.59 22.13 1997 291 ----- ----- 1997 292 17.12 21.46 1997 293 18.37 21.35 1997 294 17.05 21.50 1997 295 ----- ----- 1997 296 19.32 20.03 1997 297 16.56 21.06 1997 298 17.00 20.37 1997 299 ----- ----- 1997 300 ----- ----- 1997 301 ----- ----- 1997 302 20.36 22.02 1997 303 ----- ----- 1997 304 16.58 21.02 1997 305 ----- ----- 1997 306 17.20 18.54 1997 307 18.26 18.58 1997 308 17.05 17.43 1997 309 ----- ----- 1997 310 ----- ----- 1997 311 ----- ----- 1997 312 ----- ----- 1997 313 ----- ----- 1997 314 ----- ----- 1997 315 17.51 22.18 1997 316 17.13 20.31 1997 317 17.44 22.17 1997 318 17.16 22.13 1997 319 17.07 22.27 1997 320 16.58 22.06 1997 321 17.06 22.09 1997 322 17.11 21.43 1997 323 ----- ----- 1997 324 17.13 22.16 1997 325 17.38 21.07 1997 326 17.16 23.06 1997 327 17.10 22.42 1997 328 17.14 22.46 1997 329 ----- ----- 1997 330 ----- ----- 1997 331 ----- ----- 1997 332 ----- ----- 1997 333 ----- ----- 1997 334 ----- ----- 1997 335 18.01 21.11 1997 336 17.11 22.43 1997 337 ----- ----- 1997 338 ----- ----- 1997 339 17.19 23.14 1997 340 17.16 23.11 1997 341 ----- ----- 1997 342 17.18 23.29 1997 343 ----- ----- 1997 344 ----- ----- 1997 345 ----- ----- 1997 346 17.23 22.09 1997 347 17.17 21.33 1997 348 19.00 21.37 1997 349 17.32 22.05 1997 350 17.28 22.09 1997 351 17.22 21.27 1997 352 17.33 22.41 1997 353 17.33 22.12 1997 354 17.13 23.08 1997 355 17.13 20.56 1997 356 17.33 22.18 1997 357 17.36 22.10 1997 358 17.21 22.30 1997 359 ----- ----- 1997 360 ----- ----- 1997 361 17.28 22.18 1997 362 17.30 21.58 1997 363 17.33 22.07 1997 364 17.31 22.10 1997 365 17.28 22.20