SSOC Tohban Report for Week 18 (24-Apr-2000 to 30-Apr-2000) SSOC: K. Shibasaki, T. Kobayashi KSC: T. Morimoto, T. Miyagoshi 0.Meeting Attendees Kosugi, Kobayashi, Sakao, Sawa, Watanabe, Ogawara, Khan, Handy, Shibasaki, Hudson, Bergatze ------------------------------------------------------------------------------- 1. Solar Activity The Sun was rather quiet this week. No M class events occurred and soft X-ray(GOES) back ground level kept below C1. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Monday PM 24-APR-00 14:16 4 000424 P4 ARS1 DARKCAL Tuesday PM 25-APR-00 09:18 2 000425 P2 ARS1 STD Wednesday PM 26-APR-00 11:09 3 000426 P3 ARS1 STD Thursday PM 27-Apr-00 09:36 2 000427 P2 ARS1 IL Thursday PM 27-Apr-00 22:02 4 000427 P4 ARS1 STD Friday PM 28-APR-00 15:23 1 000428 P1 ARS2 JOP120 Friday PM 28-APR-00 20:28 4 000428 P4 ARS1 STD Saturday PM 29-APR-00 08:13 2 000429 P2 ARS1 STD ====================================================================== 2.2 STT Timer setting STT timer was re-set and started during Pass 2, 000425-0619, on 25-Apr-2000 (JST). The next timer setting should be done on 02-MAY-2000 (Tuesday). ------------------------------------------------------------------------------- 3. Special Operations none. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 "Gbo-mail" failed. Freeland san is working on this problem. 4.2 PCs at SSOC were affected by well-known virus on April 26. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact pass cancellations/additions The following schedule changes were requested: =========================================================================== DSN/NASA Schedule Week Schedule Changes =========================================================================== Final 18 2 cancellations Final 19 5 cancellations Forecast 20 7 cancellations Strawman 21 59 cancellations =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copy from /home/flare1/yohkoh/dsn_corrupt/2000/00_18)---- 103 82 0932 corrupted tape requested 18-Apr no response 21-Apr Closed /same data(16735 blocks) 104 76 0617 corrupted tape requested 18-Apr no response 21-Apr Closed /same data(13065 blocks) 110 66 0042 lacking data requested ----()---- ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In week 18, Yohkoh will lose 5 passes to ASCA and 4 to Akebono. In week 19, Yohkoh will lose 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: Bargatze, K.Hori KSC: T.Miyagoshi, S.Morita 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday, 02-MAY-2000 (JST). 7.3 OP OP and command sheets for 01-MAY-2000(Monday) was already sent to KSC. 7.4 Holiday Schedule Next Yohkoh holiday will be Sunday, 07-MAY-00 (UT). 7.5 Meeting for long-term scheduling among Halca, Asca, and Yohkoh will be held in May. 7.6 Seko san will be on Holiday in this week 7.7 Strawman(W22) DSN conflicts The negotiation will be delayed until next Monday(May 8). 7.8 KSC conflict(Yohkoh/Asca/Akebono/Halca) negotiation meeting The meeting will not be held this week. Pass selection has already done in the previous week. ------------------------------------------------------------------------------ 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) 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) 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) 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. All these 3 problems above (item 8.4, 8.6 and 8.7) occurred also on week 45 in 1999. 8.8 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. === END ===