SSOC Tohban Report for Week 50 (04-Dec-2000 to 10-Dec-2000) SSOC: M.Sawa, A.Takeda KSC: M.Hagino, Y.Nishino 0. Meeting Attendees J.I.Khan, R.Kano, T.Kosugi, G.L.Slater, Te.Watanabe, T.Tamura, J.Bartus, T.Sakao, and A.Takeda. ------------------------------------------------------------------------------- 1. Solar Activity Solar activity has been low this week. Only one M-class flare occurred on 6-Dec at NOAA 9246 near the west limb, while a distinct coronal-hole channel showed its 5th(at least) disk passage. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Monday AM 3-DEC-00 22:08 2 001203 P2 ARS2 HORI* Tuesday AM 4-DEC-00 20:31 1 001204 P1 ARS2 DARK* Tuesday AM 4-DEC-00 23:54 3 001204 P3 ARS2 MEOC+CDS* Wednesday AM 5-DEC-00 22:16 2 001205 P2 ARS2 MEOC+CDS* Thursday AM 6-DEC-00 18:58 1 001206 P1 ARS2 DIFF* Thursday AM 6-DEC-00 22:20 3 001206 P3 ARS2 MEOC+CDS* Friday AM 7-DEC-00 20:42 2 001207 P2 ARS2 MEOC+CDS* Saturday AM 8-DEC-00 20:46 2 001208 P2 ARS1 STD* ====================================================================== 2.2 STT Timer Setting The STT timer set during Pass 2 on Tuesday, 04-Dec-00 JST (PASS ID: 001204-1445). ------------------------------------------------------------------------------- 3. Special Operations SXT normal pointing was performed three times (at 001206-1238, 001207-1239, and 001208-1445), since the former two trials did not work effectively. Tet Watanabe-san examined this problem and clarified that it was caused by insufficient OG archive on WS. It turned out, at the previous normal pointing, which was done on 9-Nov, the tobans did not use PRINT_OG program on IDL to print the edited OG, and thus the OG archive on WS was not updated. SXT_CO, however, needs the most recent OG in order to calculate the new pointing coordinates. To summarize, SSOC tobans should never fail to run PRINT_OG, when the normal pointing is requested and the OG32 is edited. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None 4.2 DP Errors None 4.3 BCS Errors None 4.4 34m ANT Operation (03-Dec-00) On 34m antenna operations performed on Dec 3, the BDR REC command was not included in OP. This results in losses of data between 34m passes and between the second 34m pass and the following DSN pass. ------------------------------------------------------------------------------- 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 50 0 cancellation Final 51 2 cancellations Forecast 52 1 addition requested 10 cancellations Strawman 53 72 cancellations ======================================================================= 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_50)---- 327 16 2328 missing data requested 28-Nov no response requested 01-Nov Closed/ same data Unable to maintain solid RCVR lock on the downlink. Entered time biases to improve signal, and had some improvement in signal observed. Had intermittent lock on TGC6 TLM data but could not improve S/C AGC enough before EOT to get good TLM lock. 335 82 1909 corrupted tape requested 04-Nov no response tape requested 08-Nov 340 66 0611 missing data requested 08-Nov ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 6 passes (1 for HALCA, 5 for AKEBONO). - Yohkoh lost 4 passes (for AKEBONO). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: Kano, Tamura KSC: Nishino, Nagata(13-) 7.2 STT Timer Setting The STT TIMER SET is due Tuesday, 12-DEC-00 JST. 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The following 34m antenna operations are planned: 17-Dec-00 16:17 UT 17-Dec-00 21:23 UT 7.4 Weekend DNS passes (2000-w49) We used to schedule 12 DSN passes during the weekend, but now we have two passes with the KSC 34m antenna. So only 9 or 10 DSN passes should be scheduled for the weekend. Please be sure to cancel extra passes as early as possible. 7.5 Special Oprations Scheduled in W51 HXT calbration : 11-Dec-00 through 13-Dec-00 at pass 1 BCS calbration : 11-Dec-00(not yet confirmed) SXT CCD bake out : 12-Dec-00 through 13-Dec-00 ------------------------------------------------------------------------------ 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 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. 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) 8.7 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 8.8 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. 8.9 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. 8.10 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. [end of report]