SSOC Tohban Report for Week 46 (6-Nov-2000 to 12-Nov-2000) SSOC: K. Shibasaki, S. Masuda KSC: A. Asai, S. Eto 0. Meeting Attendees H. Hudson, J. I. Khan, D. E. McKenzie, R.Kano, K. Matsuzaki, T. Sakao, K. Shibasaki, D. Suzuki, A. Takeda, H. Tonooka, and Te. Watanabe ------------------------------------------------------------------------------- 1. Solar Activity The solar activity was not so high at the beginning of this week. However, after 7 November, it increased. Seven M-class flares (including a M7 LDE) and lots of C-class flares occurred. The GOES background level increased at the same time, but it continued to decrease for 2.5 days after the M7 flare. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Monday PM 06-Nov-00 14:36 3 001106 P3 ARS1 STD+MEOC Tuesday PM 07-Nov-00 09:37 1 001107 P1 ARS1 DARK Tuesday PM 07-Nov-00 14:41 4 001107 P4 ARS1 STD+MEOC Wednesday PM 08-Nov-00 09:42 1 001108 P1 ARS1 DIFF Wednesday PM 08-Nov-00 14:47 4 001108 P4 ARS1 STD+MEOC Thursday PM 09-Nov-00 13:10 3 001109 P3 ARS1 STD+MEOC Saturday PM 11-Nov-00 13:20 4 001111 P4 ARS1 STD ====================================================================== 2.2 STT Timer Setting The STT timer set during Pass 3 on Monday, 6-Nov-00 JST (PASS ID: 001106-0930). ------------------------------------------------------------------------------- 3. Special Operations 3.1 HXT Fine-Gain Adjustment HXT fine-gain adjustment was done in pass# 001106-0826. 3.2 HXT Calibrations HXT calibrations were done in following passes: 06-Nov-00 Pass 4 001106-1033 07-Nov-00 Pass 2 001107-0723 08-Nov-00 Pass 3 001108-0827 3.3 Normal pointing The normal pointing was updated on 9-NOV-00 (pass ID 001109-0720). ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None 4.2 DP Errors None 4.3 BCS Errors None 4.4 S-3500 Errors S-3500 was down just before the first contact on 8-Nov-00. The error ID is "4A-00C". The operation of that pass was done by using Sagamihara mainframe QL. After rebooting S-3500, it worked well. There was no problem in the following passes. KSC tohban reported that they had started QL before a FACOM operator reset the STIU. This may be a cause of the trouble. 4.5 34 m operation At the first contact on 12-NOV-00 (001112-0721), it took some time to acquire the signal from the satellite (see 8.6). First part of the repro data was lost. The cause of this problem and the amont of data lost are under investigation. ------------------------------------------------------------------------------- 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 46 7 cancellations (1 was canceled by DSN, not by us) Final 47 13 cancellations Forecast 48 no cancellation Strawman 49 57 cancellations ======================================================================= 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_46)---- 299 82 0719 corrupted tape requested 31-Oct Closed/ correct data 300 66 0105 missing data requested 01-Nov Closed/ 13969 blocks Missing 4450 TLM blocks. The pass was shorter than usual; less than 7min. The maximum elevation angle was about 7degrees. As soon as RCV got solid lock, TLM was also in lock. 302 16 1232 missing data requested 01-Nov Closed/ 14298 blocks Initially locked up on side lobe. Broke lock, added 10 sec time bias, and reaquired S/C. 306 66 2210 missing data requested 07-Nov Closed/ 12376 blocks. 6127 telemetry blocks missing at AOS due to TGC5 TCA'S not outputting data. Intialized TCA'S. 300 82 0906 corrupted tape requested 31-Oct no response tape requested 07-Nov Closed/ same data 308 82 0304 not received requested 07-Nov Closed/ correct data 308 82 0626 not received requested 07-Nov Closed/ correct data 308 82 0809 not received requested 07-Nov Closed/ correct data 309 82 04505 corrupted tape requested 09-Nov ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 6 passes (to AKEBONO). - Yohkoh will lose 3 passes (to HALCA). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: Suzuki, Tonooka KSC: Eto, Kumagai 7.2 STT Timer Setting The STT TIMER will be set on Tuesday, 14-Nov-00 JST 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The 34m antenna operations are planned on Sunday, 19-Nov-00 5:29 and 8:53 UT. ------------------------------------------------------------------------------ 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). Due to the narrow antenna beam, acquision of the signal from the satellite at the first contact need some time. It is suggested that the KSC REPRO should start one minutes later compared to the 20 m operation. (w46) Also, max elevation of the 34 m antenna should be checked carefully using Weekly Visible Diagram (do not trust op_first_guess nor AOSLOS listing). Max elevation should be less than 76 degree. (w46) 8.8 DSN Max Elevation DSN max elevation must be higher than the following value: Contact Max El.(degrees) Madrid 10.0 (2000-w45) Santiago 13.5 (2000-w44) 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 proposed 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 STT MAP operation in OP (2000-w42) 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 (10steps) 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.