SSOC Tohban Report for Week 43 (16-Oct-2000 to 22-Oct-2000) SSOC: J. I. Khan, H. Hara KSC: T. Shimizu, M. Kubo 0. Meeting Attendees H. Hara, J. I. Khan, T. Kosugi, D. E. McKenzie, K. Matsuzaki, T. Miyagoshi, Y. Ogawara, A. Takeda & T. Watanabe ------------------------------------------------------------------------------- 1. Solar Activity Solar activity remained not so high. There were only two GOES M-class flare last week and many (mostly low) C-class flares. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Monday AM 16-Oct-00 00:26 3 001016 P3 ARS1 DIF Tuesday AM 17-Oct-00 00:32 3 001017 P3 ARS1 STD Wednesday AM 17-Oct-00 19:32 1 001017 P1 ARS1 DARK* Wednesday AM 18-Oct-00 00:38 4 001018 P4 ARS1 STD Thursday AM 18-Oct-00 23:02 3 001018 P3 ARS1 STD* Friday AM 19-Oct-00 21:25 3 001019 P3 ARS1 STD* Sunday AM 21-Oct-00 19:55 2 001021 P2 ARS1 STD ====================================================================== 2.2 STT Timer Setting The STT timer was set during Pass 2 on Tuesday, 17-Oct-00 JST (PASS ID: 001016-1546). ------------------------------------------------------------------------------- 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 4 on 19 Oct (001019-1547). 3.2 BCS Calibrations Stim Cal (Day): During 001021-1547 Pass 4 on 21 Oct. Source Cal: On 21 Oct at 21:21-21:32 UT. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors Bit map errors were found at Pass 3 on Monday, 16-Oct-00 JST (PASS ID: 001016-0101) and at Pass 5 on Friday, 20-Oct-00 JST (PASS ID: 001020- 0102). These were cleared by Yobi-C command in the same passes. 4.2 DP Errors None 4.3 BCS Errors A BCS Error was discovered on pass 1 on 21-Oct (001021-1237). It was recovered on pass 3 (001021-1444) 4.4 Canopus tracking errors IRU seems to be stable. No problem. 4.5 MS Computer Trouble 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. ------------------------------------------------------------------------------- 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 43 6 cancellations by SSOC for the weekend operation Final 44 21 cancellations and 1 addition Forecast 45 10 cancellations and 2 additions Strawman 46 33 cancellations ======================================================================= 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_43)---- 277 82 1701 corrupted tape requested 06-Oct no response tape requested 12-Oct Closed/ correct data 278 82 1711 corrupted tape requested 06-Oct no response tape requested 12-Oct Closed/ same data 279 82 1713 not received requested 13-Oct no response tape requested 17-Oct Closed / correct data 287 G16 1934 lacking requested 17-Oct Closed/ 4742 blocks IIRV had +9 second time bias. Late lockup caused loss of approximately 3 minutes dump data. Contingency acquisition procedures accomplished to acquire main lobe at 194134z. 292 M66 0514 - 0524 - 13786 blocks Initial acquisition was lost due probably to bad predicts or low S/L from the S/C. 290 W76 1638 -1648 - No Data Antenna operator noticed AGC's were low & could not autotrack. autotrack.After approximately ~ 2 min. dump appeared to come on but we were unable to get a solid lock on data. Only saw ~1 min.of dump data and never got solid lock. Believe spacecraft was at low power. Tried adding time bias & manual positioning but unable to get a better lock. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost no passes (to HALCA). - Yohkoh will lose no passes (to HALCA). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: M. Akioka, T. Miyagoshi KSC: M. Kubo, Isobe 7.2 STT Timer Setting The STT TIMER will be stopped on Monday, 23-Oct-00 JST. 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The 34m antenna operations will be on Saturday, 29-Oct-00 15:34 and 20:41 JST. 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. ------------------------------------------------------------------------------ 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 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 =========================