SSOC Tohban Report for Week 34 (14-Aug-2000 to 20-Aug-2000) SSOC: H. Tonooka KSC: M. Hata, R. Haga 0. Meeting Attendees Ogawara, Sakao, Kosugi, Hudson, Asai, Watanabe, Matsuzaki, Nagata, Tonooka, Hara ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was gradually decreasing at the last week. GOES background was at about C1 level at the beginning of the week, sub C level at the weekend. The Sun produced no M class flare and 4 of grater than C5 class flares. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Monday PM 14-AUG-00 06:38 3 000814 P3 ARS1 RAPID Tuesday AM 15-AUG-00 01:42 1 000815 P1 ARS2 DARKFL Tuesday PM 15-AUG-00 06:46 4 000815 P3 ARS2 DIFFL Wednesday PM 16-AUG-00 06:53 4 000816 P3 ARS2 RAPFL Thursday PM 17-AUG-00 03:35 2 000817 P2 ARS2 RAPFL Friday PM 18-AUG-00 03:43 2 000818 P2 ARS2 RAPFL Saturday PM 19-AUG-00 03:50 2 000819 P2 ARS1 STD ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 2 on Tuesday, 15-AUG-00 JST (Pass ID: 000815-0307). ------------------------------------------------------------------------------- 3. Special Operations None. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors 18-AUG-00 (Fr) pass5 (000818-0618) bitmap error was found, recovered during the pass by Yobi-C command. 4.2 DP Errors 15-AUG-00 (Tu) pass4 (000815-0514) error code was 81. Error flag was reset at pass5 (000815-0617). The cause was not found yet. Under investigation. 4.3 BCS Errors 14-AUG-00 (Mo) pass5 (000814-0621). They recovered during the pass. 4.4 Network down 17-AUG-00 (Th), network line via Kagoshima Univ. was down because of the thunderstorm. 4.5 'Wrong universal time in some KSC repro data in SIRIUS' was fixed According to Kosugi san, the trouble in SIRIUS reported in 2000-w31 SSOC report was fixed. The engeneer also fix the wrong time stamp of the data before. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 34 0 additions 1 cancellations Final 35 0 additions 2 cancellations Forecast 36 0 additions; 0 cancellations by SSOC Strawman 37 57 cancellations (Seko: 0, SSOC: 57) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_34)---- I take a holiday during w34_2000. Yoshiko Seko(NEC) ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 6 passes (2 to HALCA, 4 to ASCA). - There were 2 down-link-only passes on Sunday. - Yohkoh will lose 6 passes (6 to AKEBONO). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: A. Asai and H. Hara KSC: R. Haga and Y. Saito 7.2 STT Timer Setting The next STT TIMER SET is due on 22-Aug-2000 (Tuesday) UT. 7.3 Holiday Schedule The next 20m antena operation holiday will be 27-Aug, Sunday JST. 34m antena operations on 27-Aug-200 are 000826-1444 21:58-22:10(UT) (06:58-07:10 JST) 000827-0207 03:04-03:18(UT) (12:04-12:18 JST) 7.4 OP OP and command sheets for Monday (21-Aug-2000) were prepared and were sent to KSC. ------------------------------------------------------------------------------ 8. Unchanged Hikitsugi Items from Previous Weeks: 8.1 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.2 Software Problems PR_GEV with /hc keyword produces a temporary output file but does not print it at the printer. 8.3 OP_FIRST_GUESS Problem (1999-w38, 1999-w45) 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 Lemen-san, but no answer had arrived at the time of writing. 8.4 Keeping Wallops Contacts (1999-w42, 1999-w45) This is not a new policy, but to emphasize (paraphrased from e-mail from Hugh Hudson): We should keep all valid Wallops passes, independent of day/night status, in order to maximize our Wallops use and minimize our DSN use. NASA won't give us many DSN passes anyway, so if we select a Goldstone pass in preference to a Wallops one, we'll normally just lose both. Another reason is that CANCEL_DSN software needs some repair, since it seems to replace the DSS identifier WGS with 0. This is likely to cause confusion, but of course if we don't cancel Wallops passes we won't have this problem often. 8.5 OP_FIRST_GUESS Problem (1999-w46, 1999-w45) During the preparation of 991109-1238 OP,991110-1135 OP and 991111-1032 OP OP_FIRST_GUESS crashed with the message "OP_START_END: problem with detection of LOS/AOS/DSN Repro events". This problem was solved by changing OP_FIRST_GUESS options: choose optimization 1 rather than 2. 8.6 DSN Pass Additions (2000-w20) *** Don't forget to request pass additions! *** Yohkoh loses DSN passes as follows: (1) Canceled due to conflicts with ASCA (by Seko-san) (2) Canceled because Santiago is unavailable (3) Canceled by the SSOC tohbans (4) Deleted by DSN The Tohbans SHOULD COMPARE the STRAWMAN, PRELIMINARY and FINAL schedules -------------- for each week to see if some of the passes lost by case (4) could be replaced by ones from case (3). This means it may be possible to request pass additions for the PRELIMINARY and FINAL week schedules from the (case (3)) STRAWMAN cancellations. (The cancellations by Seko will generally be marked in red ink, and those by SSOC by pencil: Only request additions from the penciled cancelations). The routine to use is ADD_DSN: e.g., IDL> ADD_DSN, 28, /prelim and IDL> ADD_DSN, 29, /final Decide on the complete list of passes to be added and select them like CANCEL_DSN. Then ftp and email the appropriate file. 8.7 OP Sequence for KSC Operation Using 34 m Antenna (2000-w24) KSC downlink operation with 34 m antenna has started since the end of May 2000. Since we cannot send any command to Yohkoh with 34 m antenna, the downlink operation is conducted with OP commands. 8.8 34m ANT Operation (2000-w33) 34m Operation will be done only on Sunday (=Yohkoh holiday) for up to 2 or 3 passes. There will be no 34m OP to compensate for the lost pass due to the conflict with the other satellites. For further details, please ask Kosugi-san. Note that 34m operation requires more CE slots in OP table than DSN operation does. Weekend OP cannot accomodate many 34m passes without sacrificing even more DSN passes. Maybe, a couple of other items should be added to the operation manual ( see 4.4 of w32-2000 report). ------------------------------------------------------------------------------ === END ===