SSOC Tohban Report for Week 34 (19 Aug. - 26 Aug.), 1996 SSOC: H. Hudson and K. Nakakubo KSC: M. Shimojo and K. Kumagai 0. Meeting Attendance ---------------- OGAWARA, KOSUGI, WATANABE, TSUNETA, Sawa, Akiyama, Nakakubo, Sterling, Hudson, Savy 1. Solar Activity ---------------- Solar Activity returned with the third rotation of AR7978 = AR7981 = AR7986, which produced a large C flare which Yohkoh caught the beginning of. The later part was a nice LDE with Type II, so we hope that a CME occurred and was well-observed by Yohkoh and by SOHO. Otherwise GOES listed 9 flares above class B2. 2. Standard Operation ---------------- 2.1. SXT Table Uploads ---------------- ---------------------------------------------- Date(JST) Pass Table ID ---------------------------------------------- Mon 19-Aug 3 960829 P3 ARS1 DKCAL Tue 20-Aug 2 960820 P2 ARS1 STD+LONG Tue 20-Aug 4 960820 P4 ARS1 STD+DIFFU Wed 21-Aug 2 960821 P2 ARS1 STD+LONG Wed 21-Aug 4 960821 P4 ARS1 STD Thu 22-Aug 3 960822 P3 ARS1 STD+LONG Thu 22-Aug 4 960822 P4 ARS1 STD Fri 23-Aug 1 960823 P1 ARS1 STD SP FLARE ---------------------------------------------- 2.2. STT timer setting ---------------- The STT timer was set during pass 1 of 20-Aug-96 JST (960820-0204). 2.3 Spacecraft offset pointings ----------------------------------------------------------------------- Date Time(UT) S/C PTG. & OG# Time(UT) S/C PTG. & OG# ----------------------------------------------------------------------- 21-Aug-96 04:00:47 E5.38 N.023 86 08:03:59 Normal 32 22-Aug-96 02:59:59 W5.12 N.023 85 06:30:39 Normal 32 In addition to this, there were many terminator images at offpoint positions specified by the SXT chief observer. 3. Errors and Problems ---------------- 3.1. SXT Errors ---------------- No errors whatsoever! 3.2. BCS Error ---------------- No errors whatsoever! 3.3. S3500 troubles at KSC There was further trouble with the S3500 and also with flare4 at KSC. The latter problem caused GBO_MAIL delays on 20-Aug. 3.4 Serious missed operation On Tuesday the SSOC tohbans neglected to read the SXT chief observer's request, hence the offpoint scheduled for the long exposures did not take place. Tohbans must be careful to establish correct communication with SXT for this kind of operation. 3.5 Not so serious SSOC miss The SSOC tohbans mis-entered an A/B antenna switch in the command sheets for one day. This error propagated through the checking procedure but was caught in time at KSC. 4. DSN Communications ---------------- 4.1. DSN Final schedule for W34 (Minor mistake) ---------------- JPL cancelled one station pass for Friday, but the e-mail from Jose Valencia was not noticed until about 2:00 pm, just before the fourth pass. The e-mail had arrived about 8:00 am but the SSOC tohbans arrived late that day. Because of the good flare probability, we decided to proceed with an OP revision and OP CONT command on Pass 5. This worked OK and sure enough, there was no flare. 4.2. DSN Final schedule for W35 ---------------- No passes were cancelled. 4.3. DSN Preliminary schedule for W36 ---------------- 1 pass was cancelled. We left some short intervals in place. 4.4. DSN Strawman schedule for W36 ---------------- Cancellations were postponed until Monday because of the unavailability of the ASCA staff and because there were possible conflicts of interest for the Santiago passes. There were no DSN conflicts with ASCA that needed resolution. 4.5. Data Transmission from DSN ---------------- *176 76 2204 not received Requested 27 Jun, 4,9,12-Jul, e-mail Requested Requested 29 Jul. not received Requested 2 Aug. Closed/ give up 203 74 1844 not received Requested 26 jul. not received Requested 2 Aug. not received Requested 12 Aug. not received Repuested 15 Aug. Closed/ cancel data 205 76 0857 3% less than expected Requested 26 jul. not received Requested 2 Aug. Closed/ same data. 212 66 2203 3% less than expected Requested 2 Aug. Closed/ same data. 213 76 0111 3% less than expected Requested 2 Aug. Closed/ same data. 213 76 0255 3% less than expected Requested 2 Aug. Closed/ same data. 215 76 0515 51% less than expected Requested 13 Aug. Closed/ same data. 215 76 0024 3% less than expected Requested 13 Aug. Closed/ correct data. 225 76 0008 not received Requested 16 Aug. Closed/ same data. 227 66 1811 not received Requested 19 Aug. Closed/ cancel data. 228 46 1917 51% less than expected Requested 20 Aug. Closed/ same data. 229 76 1832 not received Requested 20 Aug. 230 66 1725 3% less than expected Requested 20 Aug. playback the analog data Requested 22 Aug. 231 16 2226 not receiced Requested 21 Aug. 232 76 1604 54% less than expected Requested 21 Aug. 233 16 2305 playback the analog data Requested 22 Aug. 5. Yohkoh/ASCA Pass Conflicts at KSC ---------------- 4 passes in W35 are scheduled to be lost to ASCA. 6. Special Operations ---------------- 6.1 Campaigns The JOP044 campaign with SOHO continued (see offpoint schedules above). 6.2 Flare mode Starting Friday, pass #1, the SXT response to the flare flag was changed. The new flare tables have a shorter interval between the H resolution images in an effort to track ejections better. There are now two filters taken (Al.1 and AlMg) at H resolution. To make this posible the AlMg and Al12 images were dropped from the fast sequences, leaving only Al.1 and Be. Is this the right choice of two filters for the flare core? 7. Holiday Schedule ---------------- The next KSC holiday is 1-Sep-1996. H. Hikitsugi Items ---------------- H.1. Tohbans for W33 ---------------- SSOC: Tsuneta and Akiyama KSC: Kumagai and Hara H.2. STT Timer setting ---------------- The next setting is due on 27-Aug-96 JST. H.3 Sirius Data Nothing to report. H.4. OP_first_guess ---------------- (DSN contact selection) There are cases where the op_first_guess fails to pick up some DSN contacts. This occurs because of timing discrepancy in AOS time between JPL schedule table (in solass.w##) and AOS_LOS table by more than 6 min (the threshold currently used in op_first_guess). (In the case that occurred in the 13-Aug-96 OP, this discrepancy was about 6 min.) Tohbans should be careful to check if any DSN contacts is not missing. The DSN time of AOS (the 2nd of the four times they list) seems to be governed by other factors than just the orbit geometry - this may explain such a large discrepancy. H.5. flare11 no longer exists in B-toh. ---------------- Goodbye, sticky keyboard! All functions in week 34 seemed to work well on flare20. Flare14 is now in B-toh as a flare1 backup and cannot execute some of the tohban functions. H.6. Flare1 printer ---------------- The new printer next to the flare1 workstation does not accept plain- text files' printing jobs, but works only for PostScript files. Most of printing jobs from flare20 were resumed to work, but it still needs modification of scripts. Report to the software managers, if you notice any problem. The jobs to printout new DSN schedules automatically don't work correctly. We should do this manually. H.7 New clock Thanks to Nakajima-san's request, and the Yohkoh project's generosity, the Yohkoh room in B-toh now has ITS OWN CLOCK! Urgent discussion is needed on three topics: (a) where shall it be mounted? (b) who will install it? (c) will it read JST, UT, or neither of the above? H.8 Shimizu_san kindly linked the flare1 home disk to flare20, so this kind of editing can be done directly from the flare20 terminal via cd /home/flare1/yohkoh/ssoc_report. --- end of report ---