SSOC Tohban Report for Week 36 (03-Sep-2001 -- 09-Sep-2001) SSOC Tohbans : T.T. Ishii & Y. Onodera KSC Tohbans : S. Kamio & K. Fujiki 0. Meeting Attendees H.S. Hudson, Y. Ogawara, Y. Onodera, A. Takeda, K. Yoshimura, S. Kubo T. Kosugi, J. Khan, G. Slater, T.T. Ishii ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was high. The backgound level of GOES flux kept above C2 during the week. There were about 10 M-class flares and many C-class flares. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ================================================================ Monday PM 3-Sep-01 12:27 3 010903 P2 ARS1 STD Tuesday PM 4-Sep-01 07:23 1 010904 P1 ARS1 DIFF Tuesday PM 4-Sep-01 12:27 4 010904 P4 ARS1 STD Wednesday PM 5-Sep-01 07:22 1 010905 P1 ARS1 DARK Wednesday PM 5-Sep-01 09:01 2 010905 P2 ARS1 DARK Wednesday PM 5-Sep-01 12:26 4 010905 P4 ARS1 STD Thursday PM 6-Sep-01 09:01 2 010906 P2 ARS1 STD Friday PM 7-Sep-01 09:00 2 010907 P2 ARS1 STD Saturday PM 8-Sep-01 08:58 3 010908 P3 ARS1 STD ================================================================ 2.2 STT Timer Setting The STT timer was set during pass 2 (Pass ID : 010904-0619) on Tue 04-Sep-01 (UT). ------------------------------------------------------------------------------- 3. Special Operations: 3.1 Normal Pointing The SXT Chief Observer requested that OG#032 be rewritten and executed (change of normal pointing to W1.64 N1.54 arcmin). The editing of OG was done by Watanabe-san, and it was uploaded on pass 1 (Pass ID : 010906-0515) on Thu 06-Sep-01 (UT). ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors An SXT bitmap error was found during pass 1 on Tue 04-Sep-01 (UT) (Pass ID : 010904-0619) and recovered by the Yobi-C commands during the same pass. An SXT bitmap error was found during pass 5 on Sat 08-Sep-01 (UT) (Pass ID : 010908-0825) and recovered by the Yobi-C commands during the same pass. 4.2 DP Errors: None 4.3 BCS Errors: None 4.4 Status Report of Z-gyro: The new trend of the Z-gyro drift rate was observed on 08-Sep-01. The Z-gyro drift rate was -0.83deg/hour at the last pass of 7-Sep-01, while it changed to +1.94deg/hour at the first pass 8-Sep-01. During Saturday (8th) KSC contacts, the change of the drift rate seemed reduced still slowly increasing with +0.002deg/hour/orbit. ------------------------------------------------------------------------------- 5. NASA Station Schedule 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred: ========================================================================= Week Schedule Changes ========================================================================= Real-Time 36 4 cancellations, 0 addition Final 37 0 cancellation, 0 addition Preliminary 38 0 cancellation, 3 additions requested Strawman 39 52 cancellations ========================================================================= 5.2 Contacts this week and next (see 8.12): Week Wallops Santiago Goldstone Canberra Madrid NASA Japan 36 25 2 3 7 1 38 32 37 28 2 3 5 0 38 26 5.3 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2001/01_36)---- 232 80 1139 not received requested 24-Aug corrupted tape requested 28-Aug no response tape requested 31-Aug no response tape requested 04-Sep Closed/ correct data 233 80 1138 corrupted tape requested 28-Aug no response tape requested 31-Aug no response tape requested 04-Sep Closed/ correct data 239 82 0444 corrupted tape requested 31-Aug Closed/ correct data 240 82 0442 corrupted tape requested 31-Aug Closed/ correct data 243 82 2335 corrupted tape requested 04-Sep Closed/ correct data 244 80 0115 corrupted tape requested 04-Sep Closed/ correct data 244 80 0256 corrupted tape requested 04-Sep Closed/ same data 241 46 2115 missing data requested 04-Sep no response requested 06-Sep 242 66 2029 missing data requested 04-Sep no response requested 06-Sep 243 46 1930 missing data requested 06-Sep 244 46 2112 missing data requested 06-Sep ------------------------------------------------------------------------------ 6. KSC Pass Conflicts and Schedule : No conflicts. : Six passes will be lost for AKEBONO. ------------------------------------------------------------------------------ 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC Tohbans : H.S. Hudson & S. Kubo KSC Tohbans : K. Fujiki & J. Kiyohara 7.2 STT Timer Setting The STT Timer Set is due on Tuesday 11-Sep-01 (UT). 7.3 Holiday Schedule The next holiday is Sunday 16-Sep-01 (JST). The 34m-antenna operations are scheduled for pass 2 (03:38 (UT)) and pass 5 (08:44 (UT)). The operations with these antenna will be downlink only. 7.4 STT MAP operation in OP (see 8.10) Note that we have stopped the STT MAP commands and operations in the OPs. 7.5 The OP and the command sheets for today The OP and command sheets for today, Monday 10-Sep-01 (UT), have been already been checked and sent to KSC. 7.6 Others Japanese SSOC Tohban-manual was revised by T.T.Ishii. ------------------------------------------------------------------------------ 8. Unchanged Hikitsugi Items from Previous Weeks: 8.01 DSN Pass Additions (2000-w20; modified 2001-w10) >>>>>*** DON'T FORGET TO REQUEST PASS ADDITIONS!!! ***<<<<<<< Yohkoh loses DSN passes as follows: (1) Canceled by the SSOC tohbans (2) 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 (2) could be replaced by ones from case (1). -------------- Thus it may be possible to request pass additions for the PRELIMINARY and FINAL week schedules from the [case (1)] STRAWMAN cancellations. Only request additions from the crossed out cancellations done by SSOC. The routine to use is ADD_DSN: e.g., IDL> add_dsn, 28, /prelim 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. 8.02 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.03 Software Problems PR_GEV with /hc keyword produces a temporary output file but doesn't print it at the printer. 8.04 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. (3) (2001-w06) OP_FIRST_GUESS frequently got confused about start times, trying to read weekly files extending forward years from the present. Retries eventually worked. 8.05 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. 8.06 34m ANT Operation (2000-w33, 20001-w12) 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 accommodate many 34m passes without sacrificing even more DSN passes. 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). Try to avoid zenith passes ( Max. El. >76 degree) in planning. However, do not try to change the already fixed schedule just because the pass chosen turns out to be a zenith pass. There's no problem using the zenith pass with extra few op commands. (2001-w12) 8.07 Weekend DSN 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. 8.08 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 8.09 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). HALCA groups operate the satellite from ISAS. SSOC tohbans must be careful to transfer OP and SXT tables in the following periods, an hour before the beginning 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 STT MAP operation in OP (2000-w42, revised at 2000-w53, 2001-w08, 2001-w24) Since 2001-w25, we will stop the daily STT MAP operation in OP. 8.11 Bug-fix Report about the Attitude Determination Software (ADS) at 200-w53 Related with the Y2K problem, a software bug was found in the attitude detection software. The problem occurred 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 Sirius database, while it must be done using the elements of the day nearest to the observation date. This bug 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. 8.12 print_contact (2001-w07) It's helpful to see the actual statistics of the DSN/Wallops station passes. The program "PRINT_CONTACTS" does this for inclusion in the weekly report, e.g. IDL> print_contacts,[6,7] lists the passes for weeks 6 and 7. 8.13 New 26m Equipment for Yohkoh (2001-w23) We received email from Ida Millner @ GDSCC @ NASA to advise us about the transition to new 26m equipment for Yohkoh which will start sometime after DOY 215. Yamada-sensei at ISAS will handle the consultation related to these changes. Future SSOC tohbans should keep an eye on the station identifiers in the schedules we receive from DOY 215 to check for possible software modifications which may be necessary if these change. > From: Millner, Ida > Subject: OPD-SOLA-001: Transition to 26M New Equipment for Solar-A (SOLA) > > 1) PURPOSE: > To advise the supporting stations of the transition to the 26M new > equipment for Solar-A. > > 2) EFFECTIVE PERIOD: > Upon receipt through DOY 215, when another OPD will be issued or a PCN > supercedes this OPD. [end of report]