SSOC Tohban Report for Week 26 (19-Jun-2000 to 25-Jun-2000) SSOC: T. Ishii, T. Yokoyama KSC: M. Shimojo, T. Sakao 0. Meeting Attendees Handy, Khan, Kosugi, Nagata, Ogawara, Sawa, Yaji, Yokoyama, Watanabe ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was moderate at the beginning of this week and became high from Wednesday. The GOES soft X-ray background level was changed from B7 to C1. Five M-class and many C-class flares occurred in this week. There were about 10 active regions on the disk. The active regions NOAA 9046 and NOAA 9042 produced the majority of flares occurred in this week. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Monday PM 19-JUN-00 09:18 3 000619 P3 ARS1 DARK Tuesday PM 20-JUN-00 11:09 4 000620 P4 ARS1 DIF Wednesday PM 21-JUN-00 07:53 2 000621 P2 ARS1 STD Thursday PM 22-JUN-00 06:20 2 000622 P2 ARS1 STD Friday PM 23-JUN-00 08:10 3 000623 P3 ARS1 STD ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 3 on Tuesday, 20-Jun-00 (ID: 000620-0619). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Normal Pointing Offset-pointing operation was done during Pass 1 on Tuesday, 20-Jun-00 (ID: 000620-0413). 3.2 BCS Calibration A BCS stim calibration was done during Pass 3 on Tuesday 20-June-00 (000620-619) and a source calibration was also done after that pass by using the OP. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors An SXT BIT MAP Error was found in the Pass 1 on Friday, 23-Jun-00 (PASS ID 000623-0310). This was recovered in the same pass. 4.2 BCS Errors None. 4.3 34m ANT Problems The 34m ANT trouble occurred at the last week (W25) was recovered on Thursday, 22-Jun-00. The error was due to a trouble of the AZ-axis drive motor, which was replaced with a back-up one on Thu 22-Jun-00. Now the operation is in the normal state. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 26 0 additions; 2 cancellations by SSOC Final 27 0 additions; 0 cancellations Forecast 28 0 additions; 1 cancellation by SSOC Strawman 29 65 cancellations (Seko: 6, SSOC: 59) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_26)---- 157 76 0936 not received requested 13-Jun Closed/ correct data 171 82 2350 not received requested 23-Jun ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh will lose 3 KSC 20m ANT passes for ASCA. - There will be 4 passes (down-link only) with 34m ANT. - Yohkoh lost 9 KSC passes (2 for ASCA, 1 for HALCA, 6 for AKEBONO). - There were 5 planed 34m-atn downlink-only passes. Among 5 passes planed for downlink by the 34m-ant in this week, 1 was operated normally (000624-0207), 2 were operated by using 20m-ant (000620-0516; 000621-0413), and 2 were canceled (000619-0516; 000621-0723). Each pass was handled appropriately. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: K. Yaji, S. Tsuneta KSC: T. Sakao, Y. Yamauchi 7.2 STT Timer Setting The next STT TIMER SET is due on 27-Jun-2000 (Tuesday). 7.3 OP OP and command sheets for Monday (26-Jun-2000) were prepared and were sent to KSC. 7.4 Holiday Schedule The next satellite holiday will be 02-Jul 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 (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 ===