SSOC Tohban Report for Week 49 (27-Nov-2000 to 03-Dec-2000) SSOC: K.Kobayashi, T.Sakao KSC: M.Otogawa, M.Hagino 0. Meeting Attendees There was no weekly meeting due to conflict with the Solar-B science meeting. ------------------------------------------------------------------------------- 1. Solar Activity After the string of X-class flares last weekend (last of which was an X4 at 11/26 16:48), the sun has been very quiet. In the 7 days that followed, only two M-class flares and no X class flares were observed. GOES background level remains at C1. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Monday AM 27-NOV-00 02:43 2 001127 P2 ARS1 MEOC Tuesday AM 27-NOV-00 23:26 1 001127 P1 ARS1 DARK* Tuesday PM 28-NOV-00 04:30 4 001127 P4 ARS1 MEOC* Wednesday AM 29-NOV-00 01:10 2 001128 P2 ARS1 DIFF* Thursday AM 30-NOV-00 02:57 3 001129 P3 ARS1 MEOC* Friday AM 1-DEC-00 01:19 3 001130 P3 ARS1 MEOC* Saturday AM 1-DEC-00 23:42 2 001201 P2 ARS1 STD* ====================================================================== 2.2 STT Timer Setting The STT timer set during Pass 2 on Tuesday, 28-Nov-00 JST (PASS ID: 001128-0103). ------------------------------------------------------------------------------- 3. Special Operations None ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors Bit map error on Pass 001201-1444 (2000/12/02 JST, Pass 1) 4.2 DP Errors None 4.3 BCS Errors None 4.4 34m ANT Schedule (26-Nov-00) Following 34m antenna operations were performed: 02-Dec-00 22:04 UT 03-Dec-00 03:09 UT ------------------------------------------------------------------------------- 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 49 0 cancellations Final 50 1 cancellation Forecast 51 1 addition requested (not yet confirmed) 0 cancellations Strawman 52 70 cancellations ======================================================================= 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_49)---- 299 82 0719 corrupted tape requested 31-Oct 300 82 0906 corrupted tape requested 31-Oct 295 82 1201 not received requested 25-OCt Closed/ correct data 295 66 0531 lacking data requested 25-Oct Closed/ same data (12214 blocks) 5567 telemetry blocks missing at AOS due to TGC#5 not outputting data. Channel restart solved the problem. (HALT & RUN) 295 66 0712 lacking data requested 25-Oct Closed/ same data (16883 blocks) 2000 telemetry blocks missing at AOS due to TGC#5 not outputting data. Channel restarted and problem cleared. DOY-296 M66 0355 - 0406 : No Data Unnable to acquire the signal at AOS antenna in icqt mode. Auto mode coi not entered. Antenna did not more and remain in the icqt position. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 8 passes (2 for HALCA, 6 for AKEBONO). - Yohkoh lost 6 passes (1 for HALCA, 5 for AKEBONO). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: Sawa, Takeda KSC: Nishino, Hagino 7.2 STT Timer Setting The STT TIMER SET is due Tuesday, 05-DEC-00 JST. 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The following 34m antenna operations are planned: 19-Dec-00 19:08 UT 20-Dec-00 00:14 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. ------------------------------------------------------------------------------ 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.