SSOC Tohban Report for Week 38 (13-Sep-99 -- 19-Sep-99) SSOC: H. Hudson (Kubo), Y. Hanaoka KSC: W. Yoneshima, K. Fujiki 0. Meeting Attendance Ogawara, Kosugi, Watanabe, Nitta, Sakao, Khan, Yamaguchi, and Watari -------------------------------------------------------------- 1. Solar Activity Activity was not very high through the week, but the GOES plot shows an M-class flare (17-Sep) and many C-class flares. -------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded during week 36: ===================================================== UT Date & Time Pass Table ID ===================================================== 13-SEP-99 22:57 3 990913 P3 ARS1 DARK 14-SEP-99 19:45 1 990914 P1 ARS1 DIFF 15-SEP-99 00:54 4 990914 P4 ARS1 STD 15-SEP-99 18:18 1 990915 P1 ARS0 IL+VER0 15-SEP-99 21:42 3 990915 P3 ARS1 STD 16-SEP-99 18:31 1 990916 P1 ARS0 IL-VER0 16-SEP-99 21:55 3 990916 P3 ARS1 STD ===================================================== 2.2 STT Timer setting STT timer was set during Pass 2 of 14-Sep-99. The next Timer Set is due on Tuesday, 21-Sep-99 (UT). -------------------------------------------------------------- 3. Special Operations None -------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Error BCS error was found in the pass 5 of 17-Sep. It was recovered properly. 4.2 SXT Error None 4.3 DSN Final Schedule Format. The DSN Final Schedules since w39 were not readable by op_first_guess in its original form. This is the same problem which has been reported for these weeks. There are 5-digit numbers in PASS NO. column of final schedule. Once the leading "4" is manually removed, the problem was fixed. The situation was the same last week. Part-time tohban Hudson has now repaired FMT_WALLOPS, the key routine involved in preparing the schedule databases. The patch executes the brute-force solution describe above automatically. This is now on line, and if there are problems, please inform Hudson immediately. 4.4 Mis-Detection of a Flare Position On 13-Sep, the flare-mode was triggered by a low C-class flare during a KSC contact. The KSC tohbans notified an impulsive brightening during the quiet mode in PFI field of view, but the PFI target jumped to the quiet region after entering the flare mode. Kano-san supposed that the flare region was not the brightest in the patrol image, because the flare was small, then a hot pixel or something like that was detected as a flare region. SXT may be more sensitive to this kind of mistake now because of the increase of stray light in the Be filter, which is now serving as the patrol image again after flare-mode ARS problems. -------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact pass cancelations/additions The following DSN/NASA passes were added/deleted: =================================================================== DSN/NASA Schedule Week Schedule Changes =================================================================== Real-time 38 12 cancellations, 12 by SSOC and 5 by NASA Final 39 26 cancellations by SSOC Preliminary 40 14 cancellations by SSOC =================================================================== Four Wallops contacts on 16-Sep were cancelled due to a hurricane after the OP upload at KSC. The cancellation for the strawman schedule W41 could not be done on Friday, also due to the hurricane. As described in 7.5, the next week's tohbans need to do this. 5.2 Data Transmission from NASA Ground Stations -(From /home/flare1/yohkoh/dsn_corrupt/99_38)--------------- 240 80 2135 corrupted tape requested 30-Aug corrupted tape requested 03-Aug Closed/ same data 254 80 1433 corrupted tape requested 14-Sep 254 80 1759 corrupted tape requested 14-Sep DOY-253 1419-1433 16129 blocks: Bad data coused 7.5 ant to lose D/L following ant null. 7.5 ant could not recapture D/L due to slave source data being bad becounse of ACQ data problem. DOY-253 1238-1250 No data: 7.3M ant lost auto- track and had to search for D/L signal. Lost approx 2,379 block of data. -------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 38, 10 KSC contacts were lost, 10 to ASCA. In Week 39, 11 KSC contacts will be lost, 11 to Asuka. Note: For future weeks, it would be nice if Yohkoh could get passes 4 and 5 prior to each weekend operation, and passes 1 and 2 immediately following. Doing this would allow us to retain the maximum number of NASA passes through the weekend. -------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for week 38 SSOC: M. Yamaguchi, S. Watari/K. Marubashi KSC: K. Fujiki, S. Kato 7.2 STT timer setting The next STT TIMER SET is due on 21-Sep-99 (UT). 7.3 Holiday Schedule Next Yohkoh holiday will be Sunday, 26-Sep-99 (JST). 7.4 Final Schedule Format Take note of the format of the w39 Final Schedule as discussed in Section 4.3 above. 7.5 Strawman Schedule for W41 The schedule planning at Wallops was delayed due to a hurricane, and we got the strawman schedule for W41 on Saturday. Next tohbans need to do the works related to the strawman schedule on Monday with Seko-san. 7.6 OP_FIRST_GUESS problem In a situation with two KSC cancellations on each of two days (a rare condition) the BDR optimization feature of OP_FIRST_GUESS crashed. After experimentation, we found that it ran OK without the final cancellation request (two the first day, but just the first one on the second day). The second one then had to be removed manually. Records of the problem were forwarded to Jim Lemen, but no answer had arrived at the time of writing. 7.7 Tohban Manual The English-language version of the Tohban Manual has been updated recently and should be considered authoritative. The corresponding checksheet is also new (August 1999). ------------- The Following is Unchanged from Last Week -------------- 8.1 Software problems pr_gev with /hc keyword produces a temporary output file but does not print it at the printer. 8.2 If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.3 KSC pass conflicts ASCA conflicts cause the loss of about 10 KSC contacts per week at this time. We do not know which contacts Yohkoh will lose until the weekly meeting. Santiago contacts occur on the same orbits as KSC contacts. Therefore, keep as many Santiago contacts as possible in the DSN Strawman and Preliminary Forecasts. 8.4 Command glossary We need a shorthand glossary for common OP and command-sheet commands. This already exists pretty much in the Sakao manual in Japanese, and the Week 26 tohbans started accumulating an English version on "yohkoh.glossary" === END ===