SSOC Tohban Report for Week 25 (12-Jun-2000 to 19-Jun-2000) SSOC: M.Miyashita, M.Hata KSC: M.Shimojo, Y.Matsumoto 0. Meeting Attendees Ogawara, Kosugi, Sakao, Matsuzaki, Handy, Ishii, Yokoyama, Khan, Miyashita, Hata ------------------------------------------------------------------------------- 1. Solar Activity Solar activity keeps high since previous week. 7 or 8 M-class and 1 X-class flares occurred. We can see a lot of active regions. ------------------------------------------------------------------------------- 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 12-JUN-00 11:43 2 000612 P2 ARS1 DIF 2. Tuesday AM 12-JUN-00 15:07 4 000612 P4 ARS1 DARK 4. Thursday PM 13-JUN-00 10:10 1 000613 P1 ARS1 STD 5. Thursday PM 15-JUN-00 10:27 2 000615 P2 ARS1 STD 6. Friday PM 16-JUN-00 10:35 3 000616 P3 ARS1 STD 7. Saturday PM 17-JUN-00 10:44 3 000617 P3 ARS1 STD ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 3 on Tuesday, 13 June (UT) (ID: 000613-0928). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Normal Pointing Offset-pointing operations were done between these passes (000612-0721 and 000612-0824) on Monday. 3.2 Crab observation Crab observation was done between 000614-0721 on Wednesday and 000615-0618 on Thursday. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors A bit map error was found at the pass1(000613-0721) on Tuesday. It was recoverd at the same pass. A wrong parameter included in SXT table(000615 P2 ARS1 STD) made yohkoh not take PFI images from pass2(000615-0721) on Thursday to pass2(000616-0618) on Friday. We did "SXT HALT" at the pass5(000615-1032), so sxt error flag appeared at this pass. It was recovered at the pass2(000616-0618)(which is a first pass where we can uplink that day) on Friday. After that, we can get PFI images. 4.2 BCS Errors An SEU occurred that cause BCS error at the pass3(000616-0722) on Friday. It was recoverd at the pass5(000616-0928). 4.3 34mANT Trouble 34mANT trouble occurred at the ASCA pass on Saturday. We cancelled the following 34mANT passes. :pass2(000617-0619) :pass4(000617-0825) We cannot downlink by using this ANT still now. Kubo-san and Sakao-san made some new weekend OP plans immediately on Saturday evening. (Thank you!) We uploaded OP version 5 in these OP plans at the pass3(000617-0722). This OP makes yohkoh downlink to 20mANT at this Sunday pass(000618-0619) and not use 34mANT at this Monday fist pass (000619-0516). This trouble is due to its motor trouble. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred (requested): =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 25 0 additions ; 1 cancellations by SSOC Final 26 0 additions ; 6 cancellation (SSOC: 3; DSN: 3) Forecast 27 0(3) additions(requested); 0 cancellation by SSOC Strawman 28 51 cancellations (Seko: 7, SSOC: 44 ) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_25)---- 157 76 0936 not received requested 13-Jun 159 82 0125 not received requested 13-Jun Closed/ correct data 160 76 0820 not received requested 13-Jun Closed/ correct data ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule 9 Yohkoh passes are conflicted. 5 passes -> We can only download data by 34mANT. 4 passes -> We lost these passes. 6 Yohkoh passes were conflicted. 6 passes -> We can only download data by 34mANT. 0 passes -> We lost these passes. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: Yokoyama, Ishii KSC: Shimojo, Sakao 7.2 STT Timer Setting The next STT TIMER SET is due on 20-Jun-2000 (Tuesday). 7.3 OP OP and command sheets for Monday (19-Jun-2000) were prepared. but it needs to be editted a little for 34mANT problem. 7.4 Holiday Schedule The next satellite holiday will be 25-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.