SSOC Tohban Report for Week 33 (7-Aug-2000 to 13-Aug-2000) SSOC: T. Miyagoshi, K. Nakakubo KSC: T. Koyama, M. Hata 0. Meeting Attendees Fletcher, Kano, Kosugi, Matsuzaki, Miyagoshi, Nakakubo, Ogawara ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was gradually increasing at the last week. GOES background was at sub C level, and the Sun produced two M class flares and many C class flares. M1.9 flare occured at 8-AUG (peak time: 11:15), and M1.1 flare occured at 12-AUG (peak time: 09:56). ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Monday PM 07-AUG-00 10:54 4 000807 P4 ARS1 DARK Tuesday PM 08-AUG-00 05:55 1 000808 P1 ARS0 BAKE Wednesday PM 09-AUG-00 09:26 3 000809 P3 ARS1 RAPID Thursday PM 10-AUG-00 04:28 1 000810 P1 ARS1 DIFF Thursday PM 10-AUG-00 07:51 3 000810 P3 ARS2 RAPID Thursday PM 10-AUG-00 09:34 4 000810 P4 ARS2 RAP-F Saturday PM 12-AUG-00 08:05 3 000812 P3 ARS1 STD ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 5 on Tuesday, 08-AUG-00 JST (Pass ID: 000808-0826). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Flare trigger level Flare trigger level has been increased. The SXS-NFL in SAQL DP-1 is 511 C/S. 3.2 Normal Pointing Offset-pointing operation was done during Pass 2 on Wednesday, 9-AUG-00 (ID: 000809-0516). 3.3 BCS Calibration A BCS stim calibration was done during Pass 2 on Tuesday 8-AUG-00 (000808-0516) and a source calibration was also done after that pass by using the OP. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors There was an SXT Error (SYNC1 error) during pass 2 (000811-0413) on Friday 11-AUG. KSC tohban could not find the error during this pass, because they could not use QL system. They found it in pass3 and executed Yobi-A and B commands and executed SXT Recovery Plan in pass 4. Then SXT restarted the observation 4.2 BCS Errors None. 4.3 S3500 Errors S3500 computer showed an error during pass 2 of 11-AUG (Pass ID: 000811-0413) because power source of s3500 is not enough. It was recovered in pass 3 at same day. But there is some possibility of occuring the error in future. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 33 0 additions; 1 cancellations by SSOC Final 34 0 additions 1 cancellations Forecast 35 0 additions; 0 cancellations by SSOC Strawman 36 64 cancellations (Seko: 0, SSOC: 64) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_33)---- 213 16 0704 lacking data requested 02-Aug same data requested 07-Aug Closed/ same data(15305 block) 215 66 0704 lacking data requested 07-Aug Closed/ 2038 block X axis hydraulic failure, data lost. Enable hydraulic, no time lock TLM. 216 66 2006 lacking data requested 07-Aug Closed/ 8495 block Unable to maintain accurate antenna pointing. ATS2 system found unphased. Set system to PGM mode. 215 76 2307 not received requested 07-Aug Closed/ correct data 216 82 0048 not received requested 07-Aug Closed/ correct data 216 76 0230 not received requested 07-Aug Closed/ correct data 216 82 0412 not received requested 07-Aug Closed/ correct data 217 82 0055 not received requested 07-Aug Closed/ correct data 217 76 0237 not received requested 07-Aug Closed/ correct data 217 76 0420 not received requested 07-Aug Closed/ correct data 219 82 0110 not received requested 07-Aug Closed/ correct data 216 76 2314 not received requested 09-Aug Closed/ correct data 221 16 0441 - 0450 : No data Station unable to support SOLA -- due Y-Axis hyraulic line failure. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 6 passes (1 to HALCA, 5 to ASCA). - There were 2 down-link-only passes on Sunday. - Yohkoh will lose 6 passes (2 to HALCA, 4 to ASCA). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: H.Tonooka KSC: M.Hata and R.Haga 7.2 STT Timer Setting The next STT TIMER SET is due on 15-Aug-2000 (Tuesday) UT. 7.3 Holiday Schedule The next satellite holiday will be 20-Aug, Sunday JST. 7.4 OP OP and command sheets for Monday (14-Aug-2000) were prepared and were sent to KSC. 7.5 34m ANT Operation 34m Operation will be done only on Sunday (=Yohkoh holiday) for up to 2 or 3 passes. There will be no 34m OP to compensate for the lost pass due to the conflict with the other satellites. For further details, please ask Kosugi-san. Note that 34m operation requires more CE slots in OP table than DSN operation does. Weekend OP cannot accomodate many 34m passes without sacrificing even more DSN passes. Maybe, a couple of other items should be added to the operation manual ( see 4.4 ). ------------------------------------------------------------------------------ 8. Unchanged Hikitsugi Items from Previous Weeks: 8.1 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.2 Software Problems PR_GEV with /hc keyword produces a temporary output file but does not print it at the printer. 8.3 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. 8.4 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. 8.5 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. 8.6 DSN Pass Additions (2000-w20) *** Don't forget to request pass additions! *** Yohkoh loses DSN passes as follows: (1) Canceled due to conflicts with ASCA (by Seko-san) (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 cancellations by Seko will generally be marked in red ink, and those by SSOC by pencil: Only request additions from the penciled cancelations). The routine to use is ADD_DSN: e.g., IDL> ADD_DSN, 28, /prelim and IDL> ADD_DSN, 29, /final Decide on the complete list of passes to be added and select them like CANCEL_DSN. Then ftp and email the appropriate file. 8.7 OP Sequence for KSC Operation Using 34 m Antenna (2000-w24) KSC downlink operation with 34 m antenna has started since the end of May 2000. Since we cannot send any command to Yohkoh with 34 m antenna, the downlink operation is conducted with OP commands. ------------------------------------------------------------------------------ === END ===