SSOC Tohban Report for Week 14 (27-Mar-2000 to 02-Apr-2000) SSOC: K. Akita, K. Hori KSC: K. Yoshimura, S. Kawashima 0. Meeting Attendees K. Akita, H. Hudson, J. Khan, T. Kosugi, T. Sakao, M. Sawa, T. Watanabe ------------------------------------------------------------------------------- 1. Solar Activity GOES X-ray level stayed around C2 level this week. Several M-class flares and many C-class flares were observed 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 27-Mar-00 00:47 4 000326 P2 ARS2 DIFF+MM6 Tuesday 27-Mar-00 23:16 1 000327 P1 ARS2 MM6 Wednesday 28-Mar-00 02:41 3 000327 P3 ARS2 MM6+DK Thursday 29-Mar-00 01:08 3 000328 P3 ARS1 STD Thursday 30-Mar-00 01:19 3 000329 P3 ARS1 STD Saturday 01-Apr-00 01:40 4 000331 P4 ARS1 VLA ====================================================================== 2.2 STT Timer setting STT timer was re-set and started during Pass 2, 000328-0102, on 28-Mar-2000 (UT). The next timer setting should be done on 4-Apr-2000 (Tuesday). ------------------------------------------------------------------------------- 3. Special Operations Coordinate observations with TRACE/CDS/GBOs for Max Millennium Campaign #6 have been continued. For this campaign, special SXT tables (MM6) were used. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: No BCS error was occurred. 4.2 SXT Errors: No SXT error was occurred. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact pass cancellations/additions The following schedule changes were requested: =========================================================================== DSN/NASA Schedule Week Schedule Changes =========================================================================== Real-time 14 1 Cancellation Final 15 3 Cancellations Preliminary 16 1 Cancellation Strawman 17 78 Cancellations =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copy from /home/flare1/yohkoh/dsn_corrupt/2000/00_14)---- 082 82 1429 corrupted tape requested 28-Mar Closed/ *DOY-082 W82 1429 - 1439 ; 16076 blocks Wallops had wind gusts of up to 55mph which caused antenna to sway off of satellite. 086 82 1509 corrupted tape requested 28-Mar Closed/ corret data 086 82 2016 corrupted tape requested 28-Mar Closed/ corret data ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 14, we lost 9 KSC contacts: 4 to ASCA, 5 to Akebono In Week 15, we will lose 9 KSC contacts: 6 to ASCA, 2 to Halca, 1 to Akebono ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for next Week SSOC: K. Akita, M. Sawa KSC: S. Kawashima, R. Kano 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday '4-Apr-2000 (JST)'. 7.3 OP OP and command sheets for 3-Apr-2000 have already been prepared and transferred to KSC by the W14 SSOC tohbans. 7.4 Holiday Schedule Next Yohkoh holiday will be Sunday, 9-Apr-00 (UT). 7 working days in week 15, though. 7.5 Meeting for long-term scheduling among Halca, Asca, and Yohkoh Will be held in May. 7.6 BCS High Voltage In order to increase the detector gain of BCS-A which has been gradually decreasing since the launch, the BCS high voltage will be raised on Thursday. 7.7 HXT Calibration Will be done on Friday an Saturday this week. ------------------------------------------------------------------------------ 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 Keeping Santiago contacts Currently, ASCA conflicts cause the loss of about 10 KSC contacts per week. We do not know which contacts Yohkoh will lose until the weekly meeting. Santiago contacts occur on the same orbits as KSC contacts. Therefore, please keep as many Santiago contacts as possible in the DSN Strawman and Preliminary Forecasts. 8.4 Software Problems pr_gev with /hc keyword produces a temporary output file but does not print it at the printer. 8.5 OP_FIRST_GUESS problem (1999-w38) 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. 8.6 Keeping Wallops contacts (1999-w42) 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. 8.7 A New Antenna System in Wallops (1999-w43) Since October 1, a new antenna GN-WGS is used instead of a 9m antenna DSS-76 in Wallops station. SSOC tohbans should not be surprised at the unfamiliar antenna code GN-WGS in the DSN schedules. This new code GN-WGS is replaced with DSS-80 in solass.w## and solsf.w## by the program "fmt_wallops". But some programs for the strawman scheduling replace it with DSS-0. 8.8 OP_FIRST_GUESS Problem (1999-w46) 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. All these 3 problems above (item 8.10, 8.11 and 8.12) occurred also on week 45 in 1999. 8.9 DSN Pass Additions Yohkoh loses DSN passes as follows: 1) Canceled due to conflicts with ASCA 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 routine to use is ADD_DSN: e.g., IDL> add_dsn, 49 Decide on the complete list of passes to be added and select them like cancel_dsn. Then ftp and email the appropriate file. 8.10 New Orbital Elements The arrival date of new orbital elements at SIRIUS was changed from Wednesday to Tuesday. === END ===