LASCO/EIT Operations Status Daily Reports -- April 1998 30-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6) ~45 min. gap in observations at 20:30 due to software anomalies during daily command uplink C3 H-Alpha program continuing 29-Apr-1998 (C1-C2-C3-EIT synoptic; SM 6; Schedule anomaly; SOHO-48; l_set_lobt) l_set_lobt uplinked at 20:55 UT S. Stezelberger discovers Kreutz Comet SOHO-48 in 29 Apr. C3 data 07:00 UT EIT synoptics failed to execute: this observation was not properly scheduled by the planning tool software. C3 H-Alpha program continuing 28-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; Schedule anomaly) 23:16 UT EIT synoptics failed to execute (apparently a ground-segment fault) C2 H-Alpha program replaced by C3 H-Alpha prog. (Clr filter, 2x2 CCD bin, full f.o.v., 3-4 hr. cadence) 27-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; FP Anomaly) 15:57 FP startup script uplinked (OBE/LEB idle) 16:44 FP settings modified 16:48 nominal C1 imaging resumed 26-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; REBOOT; FP Anomaly) C1 Polarizer sequences X3 taken. C2 H-Alpha program continues. 18:00 UT LASCO/EIT system REBOOT. 25-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6) C1,C2,C3,EIT dark images taken. C2 H-Alpha program continues. 24-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 5-6, L_SET_LOBT) 18:24 UT l_set_lobt uplinked. EIT calibrations taken; Cal lamps and burn areas. 19:01 UT Transition of submode 5 to 6 C2 Orange H-Alpha program initiated. 23-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 5) C2 H-Compression reset to 5 (from H-Comp6) 22-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 5) OBE/LEB possible "clock synch" problem 13:18-13:23 UT (spontaneously corrected after 13:23 UT) 21-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6-5) C2 "H-Compression" scale factor increased by 1 (for SPE effects) (i.e. H-Comp6 instead of H-Comp5) after 18:57 UT TM Submode 6-to-5 transition at ~19:57 UT NOTE: Most FP Check&Corrects failed at this time (SPE effects) 20-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6) Solar Proton Event; increased energetic-particle flux in LASCO/EIT images. Synoptic obs. continuing. 19-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6) weekly EIT/LASCO Dark Img. calibrations executed 18-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; LASCO doors opened) All 3 LASCO doors re-opened 21:22-21:51 UT synoptic observations resumed by ~22:30 UT 17-Apr-1998 (C1-C2-C3-EIT synoptic; TM SM 3-6; Mom. Mgt.; LASCO doors closed) TM Submode 3-to-6 transition at 13:02 UT All 3 LASCO doors closed 14:58-15:12 UT in prep. for maneuver EIT-only 195A CME Watch begun at 15:30 UT (with C2/C3 cal lamp exposures) 16-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 3) 15-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 3) 14-Apr-1998 (C1-C2-C3-EIT synoptic; SM-3; ICE REBOOT; EIT cals) ICE-A REBOOT at 01:25 UT (to reset EIT/LASCO zone heaters) EIT post-bakeout calibrations executed 01:57-04:11 UT EIT synoptic observations resumed ~05:00 UT 13-Apr-1998 (C1-C2-C3 synoptic; TM Submode 3; EIT CCD Bakeout) EIT CCD heaters powered down at 22:00 UT 12-Apr-1998 (C1-C2-C3 synoptic; TM Submode 3; EIT CCD Bakeout) EIT CCD bakeout 11-Apr-1998 (C1-C2-C3 synoptic; TM SM-3; EIT CCD bakeout; SOHO-46; SOHO-47) EIT CCD Bakeout C1, C2, C3 Weekly Dark Images taken K. Schenk discovers non-Kreutz Comet SOHO-46 in C3 data K. Schenk discovers Kreutz Comet SOHO-47 in C3 data (both comets subsequently visible in C2 data) 10-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 3; EIT CCD Bakeout; l_set_lobt) 17:40 UT l_set_lobt uplinked 17:45-22:00 UT EIT pre-bakeout calibrations 22:00 UT EIT CCD Bakeout till 22:00 UT Monday Apr 13 (~72 hrs.) 09-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6-3) TM Submode 6-to-3 transition at ~15:57 UT Mars enters C3 field of view from West 08-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6) continuing evaluation of new FeX, FeXIV "triplet" wavelengths operator error delayed start of synoptic prog. ~42 min. at 17:34 UT 07-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; InterCal001) EIT InterCal001 (with CDS) ~17:03-18:20 UT 06-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; l_set_lobt) 304A CME Watch stopped and 195A Watch resumed at 18:54 UT l_set_lobt uplinked at 18:05 UT 05-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; 304A CME Watch) 04-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; 304A CME Watch) EIT post-bakeout "7 day cals" executed out-of-order Saturn enters C3 field of view from West 03-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; 304A CME Watch) 02-Apr-1998 (C1-C2-C3-EIT synoptic; TM SM 6; 304 CME Watch; SOHO-45; l_set_lobt) l_set_lobt uplinked at 16:47 UT C1 10s, 15 s Dark Img. taken ~16:20 UT D. Biesecker discovers Comet SOHO-45 in C2 data Mercury enters C3 field of view from East 01-Apr-1998 (C1-C2-C3-EIT synoptic; TM Submode 6; EIT 304A CME Watch)