SSOC Tohban report for Week 45 (8 November - 14 November 1993) A. Sterling, K. Shibata (SSOC) Y. Kato, K. Suga (KSC) 1. General Partial Solar Eclipse observations by SXT were planned for Saturday (13-Nov). Beautiful pictures of the 6-Nov Mercury transit have been developed by Freeland san and Hudson san. 2. Solar Activity Solar activity during the last week was generally low, though it is becoming higher due to new active region coming from east limb. An M2-class flare occurred on 12 Nov. near 2 UT in NOAA 7618. All but the late decay phase, however, occurred during night and/or SAA. An interesting B-class flare occurred on 9 Nov. 10:34-10:51 in NOAA 7631, which was associated with an X-ray filament eruption. This might be the smallest flare associated with X-ray filament eruption until now. 3. Standard Operations 3.1 SXT Table Uploads Nov 08 Pass2 931108 T1 P2 BAKEOUT Nov 09 Pass1 931109 T1 P1 BAKEOUT Nov 10 Pass3 931110 T1 P3 ARS1 DKCAL Nov 11 Pass2 931111 T1 P2 DEEP CORONA E Nov 11 Pass4 931111 T2 P4 ARS1 STD Nov 12 Pass3 931112 T1 P3 ARS1 STD NO Nov 13 Pass1 931113 T1 P1 ECLIPSE TEST (*) Nov 13 Pass3 931113 T2 P3 ECLIPSE Nov 13 Pass5 931113 T3 P5 ECLIPSE TWO (*) test table. 3.2 STT Timer Set STT timer was set on 9 November. The next setting should be done on Tuesday 16 November. 3.3 Weekly Offset Pointing The 8' deep corona offset pointing was performed on Thursday. 3.4 BCS Calibrations BCS did Stim and Source CALs on Nov. 9. 4. Special Operations 4.1 SXT CCD Bake Out TEC OFF and Heater ON were performed on Nov. 8, and Heater OFF and TEC ON were performed on Nov. 10. 4.2 Partial Eclipse Observation This required two offpoints--one South and one East--on Saturday. 5. DSN Items No problems with general data. JPL is in the process of transferring Yohkoh (and ASUKA) to a new telemetry system. In preparation for this, they performed a test whereby data from a pass on DOY 310 was sent by both the standard and the new telemetry systems. We had Kato san process those data. It turns out the new telemetry system data were NOT readable. Specifically, the order of the frames were reversed. We have reported these results to JPL (Espinueva san). 6. Errors 6.1 DP(BDR) Error Nov 08 Pass1 - Nov 10 Pass1 DP ERR 81, BDR ERR. This was a continuation of the situation reported by the previous tohbans. The error was cleared by issuing a DP ERR CLEAR command sequence after Fujitsu obtained enough information to complete their investigation of the problem. 6.2 BCS Error BCS had an SEU on Nov 08 Pass2. It was recovered on the following pass. 6.3 SXT Error Nov 09 Pass1 SXT Bit Map ERR. Recovered during the same pass. 7. Hikitsugi 7.1 week 45 Tohbans: SSOC: Nakajima, Hudson KSC: Suga, Shibasaki 7.2 The STRAWMAN schedule for w48 had not arrived as of Saturday evening. This week's tohbans should look for the STRAWMAN and process (select passes and make cancellations) today. 7.3 STT timer set is due on Tuesday. 7.4 The DSN pass at 17:48 UT on 27-Nov-93 was not cancelled from the preliminary because we didn't know just which KSC pass will be used for pass 1 on that day. Cancel that DSN if it turns out to be between passes 1 and 2. 7.5 The SSOC-tohban manual (English version) has been extensively revised by A. Sterling. A new item (listed for Saturday) is to report changes and updates to the manual procedures via EMAIL to yohkoh_man@flare11. (This account, however, has yet to be created!!) This week's tohbans will have the first crack at making useful corrections and suggestions (e.g., to the procedure for checking SXT table uploads). Yoroshiku onegai shimasu... 8. Tohban Procedure Points. 8.1 We have found that current standard BSC Source Cals and standard SXT terminator images cannot both be scheduled for the same night period since both use campaign modes that conflict with each other. This is a problem because the terminator image operations require campaign mode to remain in effect for the entire night. Since SXT is currently performing terminator image observations at every available opportunity, it is inevitable that some scheduling conflicts will occur. Last week we got around the problem by cancelling the terminator images during the night we wanted to do the BCS Cal. Should this be a standard action, or should we look into alternative Cal and terminator image procedures? Will HXT have the same problem? 8.2 Computer 2 went down and had to be restarted twice, once on Friday evening and again on Saturday afternoon. What are the current expected down times? 8.3 We have been told that Yohkoh cannot check whether or not the OP has been sent to KSC using the terminal on the third floor during the period of ASUKA operations. Is there any other way to perform this check? Is it always necessary to do the check? 8.4 When doing the command sheets for an antenna change, what is the correct order for the TMS H REP and SXT CHK DIS commands? Sakao san's manual says that the SXT CHK DIS comes last, but the order seems to have been chosen at random in recent history. 8.5 Suga san at KSC sent a FAX reporting that the CCDHT value on the QL page was red (indicating an out-of-acceptable-range value) throughout pass 1 on 13-Nov (at -0.5 deg), despite the fact that its value was well within the range specified as "acceptable" by the MS (-20 -- +40 deg). Furthermore, Suga san says that this situation (red value on the QL) occurs from time-to-time, he thinks it may go red whenever the value goes negative. It may be that the MS and the QL have different ranges for of "acceptability," with the QL more stringent than the MS. Is this correct? If so, is the value that CCDHT hovers around really close to some actual acceptability limit? If it NOT near such a limit, can the QL acceptability values be modified so that KSC tohbans will know that they have to be concerned if all values on the QL page are not green? 8.6 Someone should check over the English version of the Sakao manual.