SSOC Tohban Report for Week 48 (20-Nov-2000 to 26-Nov-2000) SSOC: T.Morimoto, T.Miyawaki KSC: K.Kumagai, M.Otogawa 0. Meeting Attendees J.I.Khan, R.Kano, T.Kosugi, K.Kobayashi, T.Sakao Y.Ogawara, A.Takeda, T.Morimoto, T.Miyawaki, G.Slater and Te.Watanabe ------------------------------------------------------------------------------- 1. Solar Activity The solar activity was rather high. We had five X class flares (X2.0 & X2.3 & X1.9 on Friday, X1.9 on Saturday, X4.0 on Sunday). Also, four M-class (among them M8.2 on Friday and M3.5 on Saturday were great) flares occured. The GOES background level was about C1. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Monday PM 20-Nov-00 07:17 3 001120 P3 ARS2 MEOC+ASP Tuesday PM 21-Nov-00 03:58 1 001121 P1 ARS2 DARK+ASP Tuesday PM 21-Nov-00 09:04 4 001121 P4 ARS2 MEOC+ASP Wednesday PM 22-Nov-00 04:02 2 001122 P2 ARS2 MEOC+ASP Thursday PM 23-Nov-00 04:07 2 001123 P2 ARS1 DIFF+MEO Thursday PM 23-Nov-00 07:31 4 001123 P4 ARS1 MEOC Friday PM 24-Nov-00 05:54 3 001124 P3 ARS1 MEOC Saturday PM 25-Nov-00 05:58 4 001125 P4 ARS1 STD ====================================================================== 2.2 STT Timer Setting The STT timer set during Pass 3 on Tuesday, 21-Nov-00 JST (PASS ID: 001121-0515). ------------------------------------------------------------------------------- 3. Special Operations None ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None 4.2 DP Errors None 4.3 BCS Errors None 4.4 34m ANT Schedule (26-Nov-00) Sunday operations (see below) were performed not with 34m ANT but 20m ANT, because of conflicts with "Nozomi" satellite. Sunday operations : 26-Nov-00 02:08 UT 26-Nov-00 06:03 UT 4.5 KSC downlink error (26-Nov-00) KSC downlink failed on Sunday (001126-0413, 20m ANT) because 20m ant locked on Yohkoh after it had started KSC REPRO. This was due to a mistake in editing Sunday OP by us (SSOC tohbans), and we set too short interval between KSC AOS and KSC REPRO. According to the OP sheet which was uploaded on the pervious day, the OPs at the pass in problem were as follows. (on 001126) 060147- 9- 4 KSC AOS-B-DAY (<- 1) 060355- 12- 8 KSC REPRO 060811- 44- 3 KSC PAUSE-B/A 060947- 120- 13 BDR REC (<- 2) 061643- 16- 53 KSC LOS (QT ME) (1: We had to set 8 intervals instead of 4 here.) (2: Original OP sheet planned "NOP" at 061123 here. According to Hara-san's manual for 34m ANT operation, we should just change "NOP" to "BDR REPRO" and should not change its time. But we changed (not intended but just a mistake.)) All these commands above were done by Yohkoh properly, according to QL. Owning to our mistakes, some data was lost, though no great flare had taken place before this pass. We SSOC tohbans apologize for this and disturbing you all, sincerely. ------------------------------------------------------------------------------- 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 48 no cancellation Final 49 no cancellation Forecast 50 0 additions no cancellation (SSOC Tohban requested 3 additions but rejected by DSN) Strawman 51 87 cancellations ======================================================================= 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_48)---- 321 46 1722 missing data requested 21-Nov Closed/ correct data. 322 82 1951 corrupted tape requested 24-Nov ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 6 passes (5 for HALCA, 1 for AKEBONO). - Yohkoh will lose 8 passes (2 for HALCA, and the rest for AKEBONO). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: K.Kobayashi, T.Sakao KSC: Otogawa, Hagino 7.2 STT Timer Setting The STT TIMER will be set on Tuesday, 28-Nov-00 JST 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The 34m antenna operations are planned on Sunday, 02-Dec-00 22:04 and 03-Dec-00 03:10 UT. (03-Dec-00 07:04 and 12:10 JST) ------------------------------------------------------------------------------ 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.