SSOC Tohban Report for Week 30 (17-Jul-2000 to 23-Jul-2000) SSOC: M. Hagino, T.Watanabe KSC: T. Sekii, T.Miyawaki 0. Meeting Attendees Ogawara, Sakao, Hudson, Watanabe, Hagino, Kano, Khan, Kubo, Nagata, Sawa, Shimizu, ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was increasing moderate to high since the fall after the X5.7 flare last weekend. There were no X-class flares, but many M-class flares. The GOES soft X-ray background was mid-C level. AR 9077 approached to the limb and AR 9087 grew during the week. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Monday AM 16-JUL-00 20:02 2 000716 P2 ARS1 DARK* Tuesday AM 17-JUL-00 18:28 2 000717 P2 ARS1 DIFF* Tuesday AM 17-JUL-00 21:52 4 000717 P4 ARS1 STD* Wednesday AM 18-JUL-00 20:18 3 000718 P3 ARS1 STD* Thursday AM 19-JUL-00 18:44 3 000719 P3 ARS1 STD* Friday AM 20-JUL-00 17:09 2 000720 P2 ARS1 STD* Saturday AM 21-JUL-00 18:59 3 000721 P3 ARS1 RAPID* Sunday AM 22-JUL-00 15:43 2 000722 P2 ARS1 STD* ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 2 on Wednesday, 19-Jul-00 (ID: 000718-1238). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Flare trigger level The flare trigger level (SXS-NFL) remained at 511C/S during the week. 3.2 Normal Pointing Nothing changed. 3.3 HXT CAL HXT CAL was performed at 000717-1134, 000720-1031, and 000720-1135. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None 4.2 BCS Errors A BCS error occurred at 000722-0929. 4.3 34-m Error None ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 30 0 additions; 0 cancellations 1 Final 31 0 additions 1 cancellations 5 Forecast 32 0 additions; 6 cancellations by SSOC Strawman 33 55 cancellations (Seko: 4, SSOC: 51) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_30)---- 195 76 1509 corrupted tape requested 17-Jul no response tape requested 21-Jul 198 76 0704 corrupted tape requested 17-Jul no response tape requested 21-Jul 198 76 0844 corrupted tape requested 17-Jul no response tape requested 21-Jul 199 82 1215 not received requested 21-Jul 199 82 1358 not received requested 21-Jul 197 66 0347 not received requested 17-Jul Closed/ No DATA No data received on the CDR. There was a problem in the TLM support file (TCP Desktop). 199 46 0447 - 0459 : 14807 blocks - TKM dump finished early. TLM locked at 045116 on the 262K, then droped lock at 45409 ie.. only 2mins 55secs dump. Normal duration is 5 minutes, no corrective action possible. Signal strength was -95dbm, SNR was 24db. 202 66 0425 - 0437 : No data Scheduled tracking pass data loss. TCP failed to load desktop. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 5 KSC 20m-antenna passes (5 for ASCA). - There were 4 passes (down-link only) with the 34m antenna. - Yohkoh will lose 7 20-m passes (6 to ASCA, 1 to HALCA). - There will be 8 passes (down-link only) with the 34m. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: Shimizu, Shinohara KSC: Miyawaki, Ishizaki 7.2 STT Timer Setting The next STT TIMER SET is due on 25-Jul-2000 (Tuesday). 7.3 OP OP and command sheets for Monday (24-Jul-2000) were prepared and were sent to KSC. 7.4 Holiday Schedule The next satellite holiday will be 30-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. ------------------------------------------------------------------------------ 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 ===