SSOC Tohban Report for Week 16 (10-Apr-2000 to 16-Apr-2000) SSOC: S. Watari, H. Hudson KSC: R. Kano, K. Fujiki 0. Meeting Attendees Ogawara, Kosugi, Sawa, Saito, Sakao, Watanabe, Hudson, Khan, Akiyama ------------------------------------------------------------------------------- 1. Solar Activity ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Tuesday AM 10-APR-00 20:32 4 000410 P4 ARS1 JOP83+DK* Wednesday AM 11-APR-00 15:35 1 000411 P1 ARS2 JOP83+DF* Wednesday AM 11-APR-00 20:42 4 000411 P4 ARS2 JOP83* Thursday AM 12-APR-00 14:04 1 000412 P1 ARS2 JOP83* Saturday AM 14-APR-00 17:47 3 000414 P3 ARS1 STD* Sunday AM 15-APR-00 17:56 4 000415 P4 ARS1 STD* ====================================================================== note: the scheduled SXT table for Friday could not be uploaded because of an SEU. 2.2 STT Timer setting ------------------------------------------------------------------------------- 3. Special Operations 3.1 Tests of the 34-m antenna There will be extensive testing of the new 34-m antenna at KSC for downlink. This will involve manual editing of the OP to set up the telemetry bit rate and possibly other items. Please consult Watanabe_sensei for help. 3.2 BCS calibrations Passes 000410-1031, 000411-1342. 3.3 HXT calibrations Passes 000411-1032 (gain adjust), 000411-1135, 000412-0929. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: An error was discovered on pass 000414-1239, and cleared the next day on pass 000415-0826. 4.2 SXT Errors: An SEU occurred 13-Apr some time between 15:02 and 15:21, after the first KSC contact pass. The error was cleared so that observations could resume on the last pass. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact pass cancellations/additions The following schedule changes were requested: =========================================================================== DSN/NASA Schedule Week Schedule Changes =========================================================================== Final 16 One cancellation Final 17 One cancellation, no adds Forecast 18 No cancellations Strawman 19 51 cancellations =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copy from /home/flare1/yohkoh/dsn_corrupt/2000/00_16)---- 092 76 1248 corrupted tape requested 04-Apr Closed/ same data(13327 blocks) 099 16 1350 lacking data requested 10-Apr ----()---- 6. KSC Pass Conflicts and Schedule In week 17, Yohkoh will lose 5 passes to ASCA, 3 to Akebono, and 1 to HALCA. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for next Week SSOC: S. Akiyama, Y. Saito KSC: T. Morimoto, T. Morimoto 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday night, 18-Apr-2000 (JST) (or Wednesday morning, depending on the contact chosen). 7.3 OP OP and command sheets for 17-Apr-2000 should be prepared and transferred to KSC by the new SSOC tohbans. It should be uploaded on pass 3, which is after midnight JST. 7.4 Holiday Schedule Next Yohkoh holiday will be Sunday, 23-Apr-00 (UT). 7.5 Meeting for long-term scheduling among Halca, Asca, and Yohkoh Will be held in May. 7.6 OP_FIRST_GUESS problems (2000-w16) Two cases were found in which the command sheets contained a kind of format error - the D/N hashmarks at the left of the page showed night continuing, when day should have started. The list of orbit files has been out of order since the beginning of the year, a dangerous matter. Both of these problems were reported to software@isass0 and the second one should be fixed now. ------------------------------------------------------------------------------ 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 ===