SSOC Tohban Report for Week 41 (01-Oct-2000 to 07-Oct-2000) SSOC: S.Nagata/T.Watanabe/H.Hudson KSC: H. Sekiguchi/T. Shimizu (12-) 0. Meeting Attendees No WO Meeting was held. ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was moderate to calm during the week. A few M-class flares occurred at the beginning of the week, but it ceased out the remaining of the 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 2-Oct-00 07:29 3 001002 P3 ARS1 DIF Tuesday PM 3-Oct-00 05:53 3 001003 P3 ARS1 STD Wednesday AM 4-Oct-00 02:37 1 001004 P1 ARS1 DARK Wednesday PM 4-Oct-00 07:42 4 001004 P4 ARS1 STD Thursday PM 5-Oct-00 06:07 3 001005 P3 ARS1 STD Friday PM 6-Oct-00 04:31 3 001006 P3 ARS1 STD Saturday PM 7-Oct-00 02:56 2 001007 P2 ARS1 STD ====================================================================== 2.2 STT Timer Setting The STT timer was set during Pass 3 on Tuesday, 3-Oct-00 JST (PASS ID: 001003-0310). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Normal Pointing Normal Pointing was updated during Pass 3 on 6-Oct-00 (PASS ID: 001006-0309). ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors A bitmap error was found at the AOS of pass 1 on 9-Oct-00. (001008-1546). The recovery with a yobi-C command was carried out successfully during this contact. 4.2 DP Errors None 4.3 BCS Errors None 4.4 Canopus tracking errors The drift rate of IRU-Z got a big number, 2.15 deg/hour sometime around 13:00 8-Oct-00 UT and STT lost Canopus for tracking. The satellite rotated about 35 degrees around the Z-axis till 5:00 9-Oct-00 UT. 4.5 Operations Error No "MOD CNT AT" was put in the command sheet and sent to the spacecraft when the new STT timer was set on 3-Oct. ------------------------------------------------------------------------------- 5. NASA Station Schedule 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Real-Time 41 no changes Final 42 3 cancels 0 by SSOC and 3 by NASA, no adds requested Forecast 43 no changes Strawman 44 60 cancels by SSOC =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_41)---- 263 82 0456 not received requested 27-Sep 263 76 2357 not received requested 27-Sep 263 82 0456 not received requested 27-Sep Closed/ correct data arrived 263 76 2357 not received requested 27-Sep Closed/ correct data arrived 269 82 0030 not received requested 02-Oct Closed/ correct data arrived 269 82 2254 not received requested 02-OCt corrupted tape requested 03-Oct Closed/ correct data arrived 274 46 1600 lacking data requested 03-Oct Closed/ same data(14919 blocks) ANTENNA BLOWN ONTO SIDELOBE. MANUALLY SELECTED ACQ AID ANTENNA TO GET BACK ON TO MAIN BEAM. 277 82 1701 corrupted tape requested 06-Oct 278 82 1711 corrupted tape requested 06-Oct ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 3 passes (to HALCA). - Yohkoh will lose no passes (to HALCA) ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: R. Kano, A. Glover KSC: H. Adachi, T. Shimizu(10s, 12-), {A.Takeda/R.Kano (11,12)} 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday, 10-Oct-00 JST. 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The next 34m antena operation will be on Sunday, 15-Oct-00 5:56 JST. 7.4 The OP for this Monday has been created/checked and transfered to KSC. 7.5 The electorical power in KSC will be down on Sunday, 15-Oct-00 JST, because of construction of a new building. We may lose 34m antenna operation in the day. ------------------------------------------------------------------------------ 8. Unchanged Hikitsugi Items from Previous Weeks: 8.1 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.2 Software Problems PR_GEV with /hc keyword produces a temporary output file but does not print it at the printer. 8.3 OP_FIRST_GUESS Problem (1)(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. (2)(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. 8.4 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. 8.5 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. 8.6 OP Sequence for KSC Operation Using 34m Antenna (2000-w24) KSC downlink operation with 34m antenna has started since the end of May 2000. Since we cannot send any command to Yohkoh with 34m antenna, the downlink operation is conducted with OP commands. 8.7 34m ANT Operation (2000-w33) 34m Operation will be done only on Sunday (=Yohkoh holiday) for up to 2 or 3 passes. There will be no 34m OP to compensate for the lost pass due to the conflict with the other satellites. For further details, please ask Kosugi-san. Note that 34m operation requires more CE slots in OP table than DSN operation does. Weekend OP cannot accomodate many 34m passes without sacrificing even more DSN passes. Maybe, a couple of other items should be added to the operation manual ( see 4.4 of 2000-w32 report). 8.8 DSN Max Elevation DSN max elevation must be higher than the following value: Contact Max El.(degrees) Wallops 6.5 Others 7.0 8.9 OP and SXT Table Transfers Trouble (2000-w34) OP and SXT tables can not be transferred to KSC correctly when the MS computer at ISAS is in Initial Program Load(IPL). ASCA and HALCA groups operate the satellite from ISAS. We must not transfer OP and SXT tables in the following periods: "An hour before the beginning of HALCA/ASCA contact and an hour after the end of HALCA contact." As for IPL of MS computer at KSC, operators confirm if new OP and SXT tables come to MS computer at ISAS after the IPL. 8.10 Pass Conflict Issues In the operation meeting among ASCA, AKEBONO, HALCA, and YOHKOH, held on Thursday 31-Aug-00, ASCA group prpposed that (1)they used only one pass a day, time of which is located between 4 and 20 (JST), and that (2)they wouldn't use DSN contacts for ASCA operations. 8.11 Receiver Device Error in KSC (2000-w39) The receiver in KSC has some problem and cannot carry out ranging since 23-Sep-00. ======================== fin =========================