SSOC Tohban Report for Week 41 (04-Oct-99 -- 10-Oct-99) SSOC: D.Sasaki, Te.Watanabe KSC: Y. Saitoh, D.Suzuki 0. Meeting Attendance No WOM was held because of the national holiday. ---------------------------------------------------------------------------------- 1. Solar Activity Solar activity was moderate. The background level was B5-6 and several C-class flares were observed. ---------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded during week 40: ================================================== UT Date & Time Pass Table ID ================================================== 05-Oct-99 14:25 3 991005 P3 ARS1 DARK 06-Oct-99 09:29 1 991006 P1 ARS0 LAPALMA 06-Oct-99 11:13 2 991006 P2 ARS1 DIFFUSER 06-Oct-99 14:35 4 991006 P4 ARS1 IL 07-Oct-99 09:41 1 991007 P1 ARS1 STD 08-Oct-99 11:41 3 991008 P3 ARS1 STD 09-Oct-99 10:10 2 991009 P2 ARS0 IL 09-Oct-99 11:54 3 991009 P3 ARS1 STANDARD ================================================== 2.2 STT Timer setting STT timer was set during Pass 3 of 5-Oct-99 (UT). ---------------------------------------------------------------------------------- 3. Special Operations 3.1 HXT Calibrations We carried out HXT calibrations as follows: ========================================= Pass ID UT Date Pass ========================================= 991005-1136 05-Oct-99 (Tue) 5 991006-0826 06-Oct-99 (Wed) 3 991006-1033 06-Oct-99 (Wed) 5 ========================================= ---------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: None A BCS error was found at Pass 3, 9-Oct (991009-0824) and recovered at Pass 5, 9-Oct (991009-1031). 4.2 SXT Errors: None An SXT was found at Pass 5, 9-Oct (991009-1031). The SXT status did not show up correctly and were changing. KSC tohbans did not send Yobi- commands properly, as they were trapped by the BCS error above. An extra tracking on Sunday was requested and the full SXT recovery was performed at 991010-0618. ---------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact pass cancellations/additions The following DSN/NASA passes were added/deleted: ============================================================================== DSN/NASA Schedule Week Schedule Changes ============================================================================== Real-time 41 4 Cancellations by SSOC 1 Cancellation by DSN for HALCA Real-time 42 1 Cancellation by SSOC Preliminary 43 8 Additions Requested by SSOC Strawman 44 73 Cancellations by SSOC ============================================================================== 5.2 Data Transmission from NASA Ground Stations -(From /home/flare1/yohkoh/dsn_corrupt/99_41)--------------- 271 80 0811 corrupted tape requested 05-Oct Closed/ same data 271 80 0953 corrupted tape requested 05-Oct Closed/ same data 275 74 1422 corrupted tape requested 05-Oct Closed/ correct data 276 80 0551 corrupted tape requested 08-Oct 277 16 0923 locking data requested 08-Oct 278 74 1829 corrupted tape requested 08-Oct DOY-281 G16 0629-0703: Due to a spacecraft emergency, DSS-16 sola DOY-281 pass#3898 has been deleted out of the schedule. The s/c emergency is for VSOP. ---------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 41, 12 KSC contacts were lost, all to ASCA. In Week 42, 13 KSC contacts will be lost, all to ASCA. ---------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Week 41 SSOC: K.Kobayashi, T.Sakao KSC: D.Suzuki, Y.Katsukawa 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday, 12-Oct-99 (UT). 7.3 Holiday Schedule Next Yohkoh holiday will be Sunday, 17-Oct-99 (JST). 7.4 Tohban Manual The English-language version of the Tohban Manual has been updated recently and should be considered authoritative. The corresponding checksheet is also new (August 1999). ------------- The Following is Unchanged from Last Week -------------- 8.1 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.2 Keeping Santiago contacts Currently, ASCA conflicts cause the loss of about 10 KSC contacts per week. We do not know which contacts Yohkoh will lose until the weekly meeting. Santiago contacts occur on the same orbits as KSC contacts. Therefore, please keep as many Santiago contacts as possible in the DSN Strawman and Preliminary Forecasts. 8.3 OP and Real-time Command Glossary We need a shorthand glossary for common OP and command-sheet commands. This already exists pretty much in the Sakao-san manual in Japanese, and the Week 26 tohbans started accumulating an English version on "yohkoh.glossary" 8.4 Software Problems pr_gev with /hc keyword produces a temporary output file but does not print it at the printer. 8.5 OP_FIRST_GUESS problem (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. === END ===