SSOC Tohban Report for Week 03 (15-Jan-2001 to 21-Jan-2001) SSOC: Y. Kato(, Te. Watanabe) KSC: K. Matsuzaki 0. Meeting Attendees J. I. Khan, T. Kosugi, Y. Ogawara, T. Sakao, A. Takeda, Te. Watanabe, K. Yoshimura ------------------------------------------------------------------------------- 1. Solar Activity The GOES X-ray background level stayed around B7 - 8, similar to the previous to the previous week. Three M-class flares occurred; one on 19-Jan, which was luckily during Yohkoh daytime outside SAA, and two on 20-Jan, the peaks of which looked observable from Yohkoh, as well. None of those data were looked at yet. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Tuesday AM 16-JAN-01 01:09 1 010116 P1 ARS1 DARK Tuesday PM 16-JAN-01 06:14 4 010116 P4 ARS1 STD Wednesday AM 16-JAN-01 23:32 1 010116 P1 ARS1 DIFF* Wednesday PM 17-JAN-01 04:36 4 010116 P4 ARS1 STD-B Thursday AM 18-JAN-01 01:15 2 010117 P2 ARS1 STD Friday AM 18-JAN-01 23:37 2 010118 P2 ARS1 STD* Saturday AM 20-JAN-01 01:22 3 010119 P3 ARS1 STD Monday PM 22-JAN-01 03:11 4 010121 P4 ARS1 STD* ====================================================================== 2.2 STT Timer Setting The STT timer set was done at pass 3 on Tuesday, 16-JAN-01 JST (PASS ID: 010116-0310). ------------------------------------------------------------------------------- 3. Special Operations None ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors An SXT error (no fixed status displayed, perhaps due to an SEU) happend at 010115-0103, and recovered at 010115-0206. 4.2 DP Errors None 4.3 BCS Errors None ------------------------------------------------------------------------------- 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 03 1 cancellations Final 04 4 cancellations Preliminary 05 4 cancellations Strawman 06 63 cancellations ======================================================================= (Remark: Satiago passes are still allocated.) 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2001/01_03)---- 008 82 2157 not received requested 17-Jan Closed/ correct data 010 46 1437 missing data requested 17-Jan ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 5 pass for HALCA. - Yohkoh will lose total of 8 passes for HALCA and AKEBONO (4 each). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: J.I.Khan, K.Yoshimura KSC: H.Itoh, Y.Kato(-27) 7.2 STT Timer Setting The STT Timer Setting is due on Tuesday, 23-JAN-01 JST. 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) 28-JAN-01 00:08 - 00:20 UT 28-JAN-01 01:50 - 02:01 UT 7.4 Special Operation None ------------------------------------------------------------------------------ 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 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. 8.8 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, revised at 2000-w53) If possible, please schedule the STT MAP operation just before the 1st KSC Pass on next day. The OP commands to be insrted in OP are as follows; 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 Plese insert these command manually in OP schedule. The timing of these commands must be assigned around the mid-time of Canopus tracking window (note that the Canopus tracking does not work normally in this window). It is prefer that the command work during the night period of the satellite. 8.12 Bug-fix Report about the Attitude Disition Software (ADS) at 200-w53 Related with the Y2K problem, a software bug was found in the attitude detection software. The problem occured in the procedure to search the orbital element file. In the program including the bug, the attitude of the Yohkoh satellite was calculated using the latest orbital elements in DASD or Serius database, while it must be done using the elements of the day nearest to the observation date. This buf has been fixed now. This bug causes the large attitude error when the observation date and the calculation date of the attitude are largely different. From 2000 Jan. to 2000 Sep., there are 10 candidates with the attitude error greater than one minutes of arc, which are as follows (obs. date); 27-Apr-2000, 28-Apr-2000, 13-Sep-2000, 14-Sep-2000, 7-Jan-2000, 11-Sep-2000, 9-Mar-2000, 8-Jan-2000, 28-Sep-2000, 12-Sep-2000. Re-calculation of the attitude is scheduled to these 10 cases. [end of report]