SSOC Tohban Report for Week 28 (3-Jul-2000 to 9-Jul-2000) SSOC: R. Kano, H. Hudson KSC: Y. Yamauchi, S. Masuda 0. Meeting Attendees Ogawara, Isobe, Sakao, Sawa, Kano, Hudson, Watanabe, Suematsu. Khan, Handy ------------------------------------------------------------------------------- 1. Solar Activity Activity increased again, to mid-C levels, but without resulting in major flares. AR 9077, now at E63, may become a "super-region". ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Monday PM 03-JUL-00 01:00 2 000702 P2 ARS1 VLA* Tuesday PM 04-JUL-00 01:08 2 000703 P2 ARS1 DARK* Wednesday PM 05-JUL-00 01:16 3 000704 P3 ARS1 VLA* Thursday PM 06-JUL-00 01:24 3 000705 P3 ARS1 DIFF* Friday PM 06-JUL-00 23:49 2 000706 P2 ARS1 STD* Saturday PM 07-JUL-00 23:57 3 000707 P3 ARS1 VLA* ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 3 on Tuesday, 4-Jul-00 (ID: 000704-0206). The STT timer was set during Pass 2 on Thursday, 6-Jul-00 (ID: 000705-1548). ------------------------------------------------------------------------------- 3. Special Operations None. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors Bit-map error, found and corrected 000706-1445. 4.2 BCS Errors None. 4.3 34-m Error On the first pass of July 7 (20:34:19 UT) there was a problem with receiver setup on the 34-m antenna at KSC, and about 60% of the data may have been lost. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 28 0 additions; 0 cancellations Final 29 0 additions*; 2 cancellations Forecast 30 0 additions; 0 cancellations by SSOC Strawman 31 55 cancellations (Seko: 3, SSOC: 52) =========================================================================== * six requested, none granted 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_28)---- 181 82 1501 not received requested 4-Jul Closed/ correct data 181 82 1642 not received requested 4-Jul Closed/ correct data 181 82 1823 not received requested 4-Jul Closed/ correct data 181 82 2006 not received requested 4-Jul Closed/ correct data 184 66 1034 corrupted requested 4-Jul Closed/ same data 185 46 1127 not received requested 7-Jul DOY-185 46 1127 - 1138 : no data There was no pass for SOLAR-A on Doy 185 on any Station. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 7 KSC 20m-antenna passes (5 for Akebono, 2 for ASCA). - There will be 9 passes (down-link only) with the 34m antenna. - Yohkoh will lose 5 20-m passes (4 to Akebono, 1 to ASCA). - There will be 6 passes (down-link only) with the 34m. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: Isobe, Suematsu KSC: Masuda, Sekii 7.2 STT Timer Setting The next STT TIMER SET is due on 11-Jul-2000 (Tuesday). 7.3 OP OP and command sheets for Monday (10-Jul-2000) were prepared and were sent to KSC. 7.4 Holiday Schedule The next satellite holiday will be 16-Jul Sunday JST. 7.5 34m ANT Operation Manual Sakao san sent us 34m ANT Operation Manual in Japanese and revised 34m ANT Operation Sheet. Please read them. 7.6 (week 29) SXT will do a bakeout, which will require special commands. ------------------------------------------------------------------------------ 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, 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. 8.5 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. 8.6 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. 8.7 Santiago Passes (2000-w20) Since week 20 we have no longer been receiving Santiago down-link passes. So currently no Santiago passes should be included in the OPs. However this situation may change in the future as letters are being written requesting their re-instatement. 8.8 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. 8.9 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 ===