SSOC Tohban Report for Week 19 (01-May-2000 to 07-May-2000) SSOC: L. Bargatze, K. Hori KSC: S. Morita, T. Miyagoshi 0. Meeting Attendees Bargatze, Hori, Hudson, Khan, Matsuzaki, Ogawara ------------------------------------------------------------------------------- 1. Solar Activity The Sun achieved a moderate level of activity this week. Six M class events occurred during Week 19, one of which was a long duration event. The M1.5 long duration event that peaked at 1621 UT on May 5th would likely have been observed as an X class flare if it had taken place on the visible disk. Instead, the flaring region (old active region 8970- 8977 complex) had already rotated some 10-25 degrees (or about 2 days) beyond the southwest limb. An impressive CME was observed mainly off the southwest limb. Also, Trace EIT difference images clearly showed a Morton wave travelling through the lower corona which was evidently produced by the same flare. The soft X-ray (GOES) background level this week has dropped from below class C1 last week to about class B3. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Monday PM 01-May-00 10:15 3 000501 P3 ARS1 DKCAL Tuesday PM 02-MAY-00 07:00 2 000502 P2 ARS2 DIF Tuesday PM 02-MAY-00 10:24 4 000502 P4 ARS2 JOP 83 Wednesday PM 03-MAY-00 07:09 2 000503 P2 ARS2 JOP 83 Thursday PM 04-MAY-00 07:18 2 000504 P2 ARS2 JOP 83 Thursday PM 04-MAY-00 09:15 3 000504 P3 ARS1 JOP 83 Friday PM 05-MAY-00 09:10 4 000505 P4 ARS1 STD Saturday PM 06-MAY-00 07:37 3 000506 P3 ARS2 JOP122 ====================================================================== 2.2 STT Timer setting The STT timer was not reset in Week 19 since there was no opportunity to do so until Week 20. The STT timer was shutdown on Pass 4 on Tuesday, Pass ID: 000502-0721. The next timer setting should be done on 09-MAY-2000 (Tuesday). ------------------------------------------------------------------------------- 3. Special Operations 3.1 BCS Calibrations A BCS Source Calibration was performed on 05-MAY-00 during pass 3 at approximately 0932 and 0944 UT. A BCS Stim Calibration was also done on pass 3, Pass ID: 000504-0619. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 GBO-MAIL has been repaired by Freeland-san and was reported to be working by the KSC Tohbans on 01-May-2000. 4.2 KSC Yohkoh Tohbans reported that an SXT Bit Map error was occurred on Pass ID: 000501-0514. The error was recovered by Yobi-command C. 4.3 Flare 4 Panic: KSC Yohkoh Tohbans reported that Flare 4 balked during the first pass on 01-May-00 (000501-0514) producing a "panic system bus error time out message". The problem with Flare 4 was subsequently to the Flare workstation system managers. 4.4 Duplicate Orbital Elements were received for ephemeris generated starting 01-May-00. In addition, ephemeris were received for the epoch starting 28-Feb-00. Standard Yohkoh operations were not affected but Seko-san and Shuuto-san are investigating. Watanabe-san was been advised by Seko-san. 4.5 Wallops had negative acquisition of Yohkoh data on two supports this week as reported by Debbie Dukes (Honeywell Int'l). Seko-san and the SXT CO have been advised of the problem. The passes involved are: Solar o/n 46947 121/0028-0041 and Solar o/n 46962 122/0037-0051 ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes were requested: =========================================================================== DSN/NASA Schedule Week Schedule Changes =========================================================================== Final 19 1 cancellations Final 20 1 cancellations Forecast 21 0 cancellations Strawman 22 59 cancellations =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_19)---- 113 76 0418 corrupted tape requested 26-Apr ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 19, Yohkoh lost 4 passes to Asca, 3 to Akebono, and 1 to Halca. In Week 20, Yohkoh will lose 5 passes to ASCA and 1 to Akebono. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: K. Matsuzaki KSC: S. Nagata, S. Morita 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday, 09-MAY-2000 (JST). 7.3 OP OP and command sheets for Monday, 08-May-00 has already been sent to KSC. 7.4 Holiday Schedule Next Yohkoh holiday will be Sunday, 14-May-00 (UT). 7.5 Santiago Pass deletions for Week 22 need to be requested to reduce the passes selected from the available 19 passes down to 7 passes (one per day). Watanabe-san has requested that the first pass from each day (which has high enough elevation, >13.5 degrees) be kept. 7.6 Meeting for long-term scheduling among Halca, Asca, and Yohkoh will be held in May. 7.7 Strawman DSN Conflicts The negotiation for Week 23 was held today, Monday, 08-May-00. The next meeeting will be on 22-May-00. 7.8 KSC Conflict (Yohkoh/Asca/Akebono/Halca) Negotiation Meeting The next meeting will be held the week after next to omoimasu. Pass selection has already done in the previous week. 7.9 DSN Pass Additions Yohkoh loses DSN passes as follows: 1) Canceled due to conflicts with ASCA 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 routine to use is ADD_DSN: e.g., IDL> ADD_DSN, 49 Decide on the complete list of passes to be added and select them like CANCEL_DSN. Then ftp and email the appropriate file. ------------------------------------------------------------------------------ 8. Unchanged Hikitsugi Items from Previous Weeks: 8.1 Elevation Angle Limit at Santiago (w49) Seko-san noticed two fault reports from Santiago (DSS-74) due to low elevation at the end of the pass: These were shown as max elevations of 11.1 degrees (323/1322) and 10.7 degrees (315/1645) in our database. Accordingly, after consultation with Watanabe-san, we suggest increasing the threshold (for this station only) to 13.5 degrees maximum elevation. SSOC Tohban for w09 asked Hudson-san to prepare an azimuth-elevation map in Santiago station. 8.2 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.3 Software Problems PR_GEV with /hc keyword produces a temporary output file but does not print it at the printer. 8.4 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. 8.6 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. 8.7 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. ------------------------------------------------------------------------------ === END ===