SSOC Tohban Report for Week 17 (17-Apr-2000 to 23-Apr-2000) SSOC: S. Akiyama, Y. Saito KSC: K. Fujiki, T.Morimoto 0.Meeting Attendees Kosugi, Kobayashi, Sakao, Sawa, Watanabe, Akiyama, Nagata, Khan, Hundy, Shibasaki, Hudson ------------------------------------------------------------------------------- 1. Solar Activity Solar Activity is generally C1 level of GOES classification. Onle two M class flares ocuured on 15 Apr. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Tuesday AM 17-APR-00 18:16 4 000417 P4 ARS1 DKCAL Tuesday PM 17-APR-00 11:16 1 000418 P1 ARS2 JOP83+DF Wednesday AM 18-APR-00 16:43 4 000418 P4 ARS2 JOP83* Thursday PM 20-APR-00 10:14 1 000420 P1 ARS1 JOP119 Frideay AM 20-APR-00 15:19 4 000420 P4 ARS1 JOP119* Frideay PM 21-APR-00 13:46 3 000421 P3 ARS1 STD ====================================================================== note: The scheduled SXT table for Wednesday PM could not be uploaded. Because when S3500 checked SXT table, unexplained entries were found. Hara san examined SXT table mismatch error and found the following(4.1). 2.2 STT Timer setting STT timer was re-set and started during Pass 4, 000418-1134, on 18-Apr-2000 (JST). The next timer setting should be done on 25-Apr-2000 (Tuesday). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Tests of the 34-m antenna We performed extensive testing of the new 34-m antenna at KSC for downlink. This involved manual editing of the OP to set up the telemetry bit rate and possibly other items. 3.2 BCS HV-A TRIM level change High voltage power supply for BCS-A was adjusted. This operation was performed in pass 1 on Apr. 18 (000418-0824). 3.3 SXT off set point We included a command (ROG 32 (dec)) in pass 2 on Apr 19 (000419-0927) ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT table mismatch errors: The scheduled SXT table for Wednesday PM could not be uploaded. Because when S3500 checked SXT table, unexplained entries were found. Hara san examined SXT table mismatch error and found the following. From hara@solar.mtk.nao.ac.jp Thu Apr 20 16:32:16 2000 Subject: SXT TBL mismatch error When the SXT table file arrives at ISAS MS computer and the MS computer at KSC is in a normal mode, it is automatically sent to KSC MS computer. Several satellites are operated with the same KSC MS computer, and the computer is sometimes rebooted for the system change, for example, from Yohkoh to ASCA system. When the SXT TBL command and OP/OG files come to ISAS MS computer during the system transition, the files is stopped in the ISAS MS computer. In such a case the files are manually transferred by an operator at KSC. There are two ways of recognition having a new plan in ISAS MS compter; one is to look at MS display, and the other is to inform the operator of having a new plan. The latter one is done by KSC tobans by looking at the FAX or e-mail from SXT_CO. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact pass cancellations/additions The following schedule changes were requested: =========================================================================== DSN/NASA Schedule Week Schedule Changes =========================================================================== Final 18 4 cancellations Forecast 19 4 cancellations Strawman 20 33 cancellations =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copy from /home/flare1/yohkoh/dsn_corrupt/2000/00_17)---- 099 16 1350 lacking data requested 10-Apr Closed/ 4259 blocks. Just prior to AOS the LMC died. Rebooted LMC, T4 RUN1 command was given just as LMC died. Before the LMC could be rebooted and brought on-line, the pass was over. Unsure if telemetry was in lock. 103 82 0932 corrupted tape requested 18-Apr no response 21-Apr 104 76 0617 corrupted tape requested 18-Apr no response 21-Apr 109 S74 2052 - 2104 17911 blocks Several dropouts and intermittent lock at the biginning of the dump due to S/C was late 16 secs according to predicted AOS, using last IIRV, epoch time 109:20:00:00. 110 66 0042 lacking data requested 21-Apr ----()---- 6. KSC Pass Conflicts and Schedule In week 18, Yohkoh will lose 5 passes to ASCA and 4 to Akebono. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for next Week SSOC: K.Shibasaki,T.Kobayashi KSC: T. Morimoto,Miyagoshi 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday night, 25-Apr-2000 (JST). 7.3 OP We prepared OP and command sheets for 24-Apr-2000(Monday night). After KSC tohbans will check, please transferre to KSC by the new SSOC tohbans. 7.4 Holiday Schedule Next Yohkoh holiday will be Sunday, 30-Apr-00 (UT). 7.5 Meeting for long-term scheduling among Halca, Asca, and Yohkoh Will be held in May. ------------------------------------------------------------------------------ 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 ===