SSOC Tohban Report for Week 44 (23-Oct-2000 to 29-Oct-2000) SSOC: M.Akioka, T.Miyagoshi KSC: H.Isobe, M. Kubo 0. Meeting Attendees J. I. Khan, T. Kosugi, D. E. McKenzie, K. Matsuzaki, R.Kano, S.Nagata, ,M.Shimojo, M.Hagino,Y. Ogawara, A. Takeda, T. Watanabe and M.Akioka ------------------------------------------------------------------------------- 1. Solar Activity Solar activity remained not so high. There were only two GOES M-class flare last week and several (mostly low) C-class flares. On Sunday, M4.4 LDE event was erupted. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Monday AM 22-Oct-00 20:01 3 001022 P3 ARS1 DIF* Tuesday AM 23-Oct-00 20:07 2 001023 P3 ARS1 STD* Wednesday AM 24-Oct-00 16:49 1 001024 P1 ARS1 DARK* Wednesday AM 24-Oct-00 21:55 4 001024 P4 ARS1 STD* Thursday AM 25-Oct-00 18:36 3 001025 P3 ARS1 STD* Friday AM 26-Oct-00 18:42 3 001026 P3 ARS1 STD* Saturday AM 27-Oct-00 18:47 3 001027 P3 ARS1 STD* Sunday AM 28-Oct-00 17:11 3 001028 P3 ARS1 STD* ====================================================================== 2.2 STT Timer Setting The STT timer was stopped during Pass 2 on Monday, 23-Oct-00 JST (PASS ID: 001026-1031). ------------------------------------------------------------------------------- 3. Special Operations 3.1 S/C normal pointing S/C pointing is slightly changed to adjust the sun center to the SXT field of view at Pass 1 on 27 Oct (001026-1031). 3.2 HXT Calibrations HXT calibration has done at following passes: 25-OCT-00 16:54UT Pass 2 001025-1134 26-OCT-00 17:00UT Pass 2 001026-1134 27-OCT-00 17:06UT Pass 2 000127-1135 ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None 4.2 DP Errors None 4.3 BCS Errors None 4.4 Canopus tracking errors STT timer is stopped. 4.5 MS Computer Trouble MS computor trouble has not fixed on Monday afternoon and OP could not be transmitted to KSC on line. So, Moday's night's OP was set by KSC people (KSC Tohban and NEC operator) by manually following OP list sent from SSOC. The trouble was fixed on late night on Monday and SSOC Tohban received a report about MS recovery on Tuesday morning. After that, MS relating operation was done as usual. (Last week Tohban's report) After the power shutdown on Saturday, 21 Oct, the MS computer could not correctly be booted due to some trouble. Unfortunately, the OP for Monday morning was not received at KSC before the holiday, although we (SSOC) sent it on Friday at 14:18 JST. This was due to the MS shutdown at KSC after a HALCA operation. After realizing that no OP for Monday's operation was received at KSC, KSC and SSOC decided that we should operate Yohkoh at KSC alone without OP and the DSN pass cancellations were done by the SXT_CO, Takeda-san. 4.6. S-3500 in KSC was fixed. Trouble of S-3500 computer in KSC has fixed. ------------------------------------------------------------------------------- 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 44 7 cancellations by SSOC for the weekend operation Final 45 29 cancellations and 1 addition Forecast 46 1 cancellations and 2 additions Strawman 47 30 cancellations ======================================================================= 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_44)---- 295 82 1201 not received requested 25-OCt 295 66 0531 lacking data requested 25-Oct 295 66 0712 lacking data requested 25-Oct DOY-298 M66 0225 - 0235 : No DATA Unable to maintain receivers solid lock on downlink signal. Signal level observed : -140 dbm. DOY-298 M66 0406 - 0418 : 1058 blocks Unable to maintain rcv solid lock. Spacecraft rise 040803. We got -95dbm signal level at 041401 and good TLM lock. But the signal was decreasing until losing TLM lock at 041417, and RCV out of lock at 041555. Spacecraft set 041826. DOY-299 M66 0230 - 0242 : No DATA Unable to get RCV's lock. In the pass that followed, 9611, AOS at 0411, we had a nominal pass, but observed a 33 seconds time bias. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost no passes (to HALCA). - Yohkoh will lose no passes (to HALCA) and lose 4 passes (to AKEBONO) ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: M.Shimojo, M.Hagino KSC: A.Asai , Isobe 7.2 STT Timer Setting The STT TIMER will be set on Tuesday, 31-Oct-00 JST(Monday's midnight). 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The 34m antenna operations will be on Sunday, 5-Nov-00 12:49 and 16:13 UT. 7.4 The OP for this Monday has been created/checked, but not transferred to KSC. 7.5 STT MAP operation in OP If possible, please schedule STT MAP operation a few times in one OP. OG-030(DEC) CMPN OBS ON OG-117(DEC) STT MAP START ; 1 step after CMPN OBS ON OG-118(DEC) STT MAP END ; 5 min after STT MAP START OG-031(DEC) CMPN OBS OFF ; 1 step after STT MAP END Please put the above set of commands in the Canopus window, manually. It is better to put it during night. Please leave a several minutes for Canopus tracking, before starting STT MAP operation. 7.6 Receiver Device Error in KSC. Receier trouble has fixed at 12-OCT-00 and ranging function is now available. (See 8.11 in last week's tohban report) ’¡ ------------------------------------------------------------------------------ 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 (Actually it is now available until end of 2000) (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 cancellations). 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 (Santiago 13.5) 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. ======================== fin =========================