SSOC Tohban Report for Week 40 (25-Sep-2000 to 01-Oct-2000) SSOC: M.Yamaguchi, M.Sawa KSC: H.Tonooka, H.Sekiguchi 0. Meeting Attendees Takeda, Kano, Hara, Nagata, Watanabe, Ogawara, Matsuzaki, Kosugi, Sawa, Abe, Nomura ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was not so heigh this week but one X class flare and four M class flares were occured besides some C class ones. The X class flare was X1.2 in 30 September and three of M class were M1.8 in 25 September and M1.0,M1.8 flares in 30 September,and Yohkoh observed these events.But M3.4 flare in 25 September was during Yohkoh night unfotunately. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Monday PM 25-Sep-00 06:43 1 000925 P1 ARS2 JOP104 Monday PM 25-Sep-00 11:49 4 000925 P4 ARS1 DIF Tuesday PM 26-Sep-00 11:55 4 000926 P4 ARS1 DARK Wednesday PM 27-Sep-00 05:15 1 000927 P1 ARS2 JOP104 Wednesday PM 27-Sep-00 10:20 4 000927 P4 ARS1 STD Friday PM 29-Sep-00 05:27 1 000929 P1 ARS1 STD Saturday PM 30-Sep-00 10:40 4 000930 P4 ARS1 STD ====================================================================== 2.2 STT Timer Setting The STT timer was set during Pass 3 on Tuesday, 26-Sep-00 JST (PASS ID: 000926-0721). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Normal Pointing Normal Pointing was updated during Pass 1 on 27-Sep-00 (PASS ID: 000927-0411). ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors A bitmap error was found at the AOS of pass 4 on 27-Sep-00 (000927-0721). 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 Operations Error Command of timing was delayed one minutes during Pass 4 on 30-Sep-00. This fundamental mistake was occurred by miscopy of KSC tohban unfortunately. ------------------------------------------------------------------------------- 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 40 3 cancels by SSOC, no adds requested Final 41 6 cancels, 3 by SSOC and 3 by NASA, no adds requested Forecast 42 1 cancel by SSOC, no adds requested Strawman 43 63 cancels by SSOC =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_40)---- 256 16 1048 lacking data requested 22-Sep no response requested 26-Sep Closed / correct data 258 66 2340 lacking data requested 22-Sep Closed/ 4689 blocks Both TGC4 channels failed at AOS. 260 66 2354 lacking data requested 22-Sep Closed/ 13563 blocks Both TGC4 channels failed at AOS. 263 82 0456 not received requested 27-Sep 263 76 2357 not received requested 27-Sep ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 2 passes (to HALCA). - Yohkoh will lose 3 passes (to HALCA) ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: S.Nagata(2-4), T.Watanabe(5,7,9), H.Hudson(6) KSC: H.Sekiguchi, H.Adachi 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday, 03-Oct-00 JST. 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The next 34m antena operation will be on Sunday, 08-Oct-00 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 =========================