SSOC Tohban Report for Week 13 (20-Mar-2000 to 26-Mar-2000) SSOC: S. Masuda, Y. Nishino KSC: K. Kobayashi, K. Yoshimura 0. Meeting Attendees J. Khan, T. Sakao, M. Sawa, N.Nitta, T. Kosugi, T. Watanabe, K. Akita, Y. Nishino ------------------------------------------------------------------------------- 1. Solar Activity GOES X-ray level stayed around C2 level this week. Two X-class flares occurred in this week. One took place on March 22, the other on March 24. However, Yohkoh was in the shadow of the earth when these flares occurred. Several M-class 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 PM 20-Mar-00 08:06 4 000320 P4 ARS2 DARK+MM6 Tuesday PM 21-Mar-00 06:34 4 000321 P4 ARS2 DIFF+MM6 Wednesday PM 22-Mar-00 03:19 2 000322 P2 ARS2 MM6 Thursday PM 22-Mar-00 06:44 4 000322 P4 ARS2 MM6 Thursday PM 23-Mar-00 05:12 3 000323 P3 ARS2 MM6 Friday AM 24-Mar-00 01:58 2 000324 P2 ARS2 MM6 Saturday AM 25-Mar-00 00:27 1 000325 P1 ARS2 MM6 Saturday PM 25-Mar-00 05:34 4 000325 P4 ARS1 STD ====================================================================== 2.2 STT Timer setting STT timer was re-set and started during Pass 4, 000321-0414, on 21-Mar-2000 (UT). The next timer setting should be done on 28-Mar-2000 (Tuesday). ------------------------------------------------------------------------------- 3. Special Operations Coordinate observations with TRACE/CDS/GBOs for Max Millenium Campaign #6 have been continued during the week 13. For this campaign, special tables were used. The concerning SXT tables were denoted 'MM6' in the SXT tables shown above. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: No BCS error was occurred. 4.2 SXT Errors: No SXT error was occurred. 4.3 KSC 20m antenna trouble After power-outage on Sunday (19 March) in KSC, something was wrong in the 20m antenna system. The signal power was too weak to send commands to satellites when the elevation of satellites is low. So we changed the OP start time 2-minutes earlier than usual and also other commands like 'BDR REC' were executed much earlier than usual. This problem was solved after the Yohkoh operation on Tuesday (21 March). The cause of this trouble was an open-close mistake on air-duct doors. 4.4 DSN-related mail E-mail for DSN-pass deletions has been rejected at the mail-server in GSFC. This situation doesn't depend on workstations. We sent e-mail from flare20 and flare22. But there is no difference. The error message is as follows. ... while talking to funhouse.gsfc.nasa.gov.: >>> MAIL From: SIZE=1414 <<< 553 ... Service unavailable for this domain Is the domain "solar.isas.ac.jp" in some black list now? ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact pass cancellations/additions The following DSN/NASA passes were added/deleted: =========================================================================== DSN/NASA Schedule Week Schedule Changes =========================================================================== Final 14 0 Additions Requested: 5 Cancellations Preliminary 15 48 Additions Requested: 0 Cancellations Strawman 16 55 Cancellations =========================================================================== * 2 out of 5 cancellations are related to the IMAGE satellite launching. A huge number of additions in the preliminary schedule is mainly caused by cancellations of all Santiago contacts in the last week. 5.2 Data Transmission from NASA Ground Stations ----(Copy from /home/flare1/yohkoh/dsn_corrupt/2000/00_13)---- 076 82 2156 corrupted tape requested 17-Mar Closed/ correct data 079 76 1541 corrupted tape requested 23-Mar Closed/ correct data 079 82 1721 corrupted tape requested 23-Mar Closed/ correct data DOY-081 1600 - 1612 w76 : No data NOD DATA. OPERATOR ERROR. STARTED TRACK TOO LATE. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 13, we lost 9 KSC contacts: ASCA: 3, Akebono: 6 In Week 14, we will lose 9 KSC contacts: ASCA: 4, Akebono: 5 ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for next Week SSOC: K. Hori, K. Akita KSC: K. Yoshimura, S. Kawashima 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday '28-Mar-2000 (UT)'. 7.3 OP OP and command sheets for 27-Mar-2000 have already been prepared and transferred to KSC by the W13 SSOC tohbans. 7.4 Holiday Schedule Next Yohkoh holiday will be Sunday, 2-Apr-00 (JST). 7.5 Meeting for long-term scheduling among Harca, Asca, and Yohkoh Will be held in May. 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 ===