SSOC Tohban Report for Week 24 (5-Jun-2000 to 11-Jun-2000) SSOC: H. Hara KSC: H.Tonooka , Y.Katsukawa Y.Matsumoto 0. Meeting Attendees Ogawara, Kosugi, Watanabe, Sakao, Matsuzaki, Shimizu, Hudson, Hara Khan, Miyashita, Hata, Shimojo, Sawa, Sugiho ------------------------------------------------------------------------------- 1. Solar Activity Solar activity becomes high during week 24. Five M-class and three X-class flares occurred in NOAA9026. There are lots of active regions on the disk and four are at the limb. Region 9026 is going to the west limb. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== 1. Monday PM 05-JUN-00 14:07 2 000605 P2 ARS2 STD 2. Tuesday AM 05-JUN-00 17:32 4 000605 P4 ARS1 STD 3. Wednesday AM 06-JUN-00 17:40 4 000606 P4 ARS1 DIF 4. Thursday AM 07-JUN-00 17:59 4 000607 P4 ARS1 DARK 5. Thursday PM 08-JUN-00 11:10 1 000608 P1 ARS2 PFIDOM 6. Friday AM 08-JUN-00 16:15 4 000608 P4 ARS1 STD 7. Saturday AM 09-JUN-00 16:23 4 000609 P4 ARS1 STD 8. Sunday AM 10-JUN-00 16:32 4 000610 P4 ARS1 STD ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 3 on Tuesday, 6 June (UT) (ID: 000606-1032). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Normal Pointing Offset-pointing operations were done three times at the following passes during this week; 000605-0815, 000606-1032, and 000608-0723. 3.2 HXT Calibration HXT calibrations were executed three times on 5 June. After analizing the calibration data, eight OGs were uploaded and executed on 8 June for adjustment of HXT fine gain. HXT calibrations were done again four times on 8, 9,and 10 June. 3.3 BCS Detector Calibration BCS detector calibration was done during Yohkoh NIGHT three times on 7-8 Jun. 3.4 NSAS Tracking In order to investigate the stability of Yohkoh attitude control without TFSS, an operation disabling TFSS was done between 4th and 5th passes on 6 June. Yohkoh was controlled in a range of 6 arcsec peak-to-peak without TFSS. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None. 4.2 BCS Errors None. 4.3 S3500 Errors S3500 mini computer showed an error during pass 5 of 9 June (Pass ID: 000608-1136). It was recovered by the noon of the same day. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred (requested): =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 24 0 additions; 4 cancellations by SSOC Final 25 (5) additions; 2 cancellation (SSOC: 1; DSN: 1) Forecast 26 (3) additions; 2 cancellation by SSOC Strawman 27 61 cancellations (Seko: 9, SSOC: 52) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_24)---- 150 82 0654 corrupted tape requested 05-Jun no response tape requested 08-Jun 155 66 0104 missing data requested 07-Jun Closed/ same data 154 82 0727 corrupted tape requested 08-Jun 158 76 0802 not received requested 08-Jun - 0815 Closed/ No Data Following AOS, the operator went to auto track. The Y-axis dropped out of auto track and fell into the limits. Unable to get the antenna axis out of the limits. This resulted in total loss of data for this support. We had no time to get another antenna on the S/C. Troubleshooting in progress. 5.3 No modulation over three DSN passes > From Deborah.L.Dukes.1@gsfc.nasa.gov Thu Jun 8 21:51:56 2000 > > Dear Sirs: > The downlink did not appear to be on for the following supports: > Solar DS-66 157/0122z id 47487 > DS-76 157/0430z id 47489 > DS-76 157/0754z id 47491 W23 SSOC tobans requested wallops to cancel these passes, but wallops did not respond this request. Other four cancellations in the weekend were requested again by W24 SSOC toban. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Four ASCA passes were given to Yohkoh for the Crab observation. - Yohkoh will lose one KSC pass for ASCA, one for AKEBONO, and six for HALCA. - There will be seven passes with 34 m antenna. - Yohkoh lost 6 KSC passes for ASCA and 2 for HALCA. - There were nine passes with 34 m antenna. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: Miyashita, Hata KSC: Shimojo, Matsumoto_Y 7.2 STT Timer Setting The next STT TIMER SET is due on 13-Jun-2000 (Tuesday). 7.3 OP OP and command sheets for Monday (12-Jun-2000) were prepared and were sent to KSC. 7.4 Holiday Schedule The next satellite holiday will be 18-JUN Sunday JST. ------------------------------------------------------------------------------ 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 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 *** 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 by the SSOC Tohbans 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 cancelations 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. ------------------------------------------------------------------------------ === END ===