SSOC Tohban Report for Week 33 (13-Aug-2001 to 19-Aug-2001) SSOC Tohbans : Y. Katsukawa & M. Sawa KSC Tohbans : T. Morimoto & J. Kuwabara 0. Meeting Attendees M. Sawa, Y. Katsukawa, J.I.Khan, T.Kosugi, A.Takeda, H. Takasaki, N. Narukage, K. Yoshimura ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was not so high last week. The largest event was C9.7 class on August 14. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ================================================================ Saturday AM 17-Aug-01 16:10 1 010817 P1 ARS1 DARK* Saturday AM 17-Aug-01 21:15 4 010817 P4 ARS1 STD* ================================================================ 2.2 STT Timer Setting The STT timer set was done at pass 2 on Tuesday, 14-Aug-01 UT (Pass ID : 010814-1340). ------------------------------------------------------------------------------- 3. Special Operations 3.1 HXT Calibration The HXT calibration was done at pass 1 (ID : 010817-1133) and pass 2 (ID : 010817-1236) on Friday, 17-Aug-01 UT. ------------------------------------------------------------------------------- 4. Errors and Problems (1)Becaue of outage of air conditioner of KSC-MS, the 34m antenna system was used for operations. (2)20m-34m antenna changer was damaged by lightening on August 16. After that, 34m antenna was directly connected to A400. (3)At pass 2 on August 16 UT (ID : 010816-1236), BDR REC command could not reach the satellite because of low elevation. ------------------------------------------------------------------------------- 5. NASA Station Schedule 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred: =============================================== Week Schedule Changes =============================================== Real-Time 33 - Final 34 3 cancellations Preliminary 35 2 cancellations Strawman 36 67 cancellations =============================================== 5.2 Contacts this week and next (see 8.12): Week Wallops Santiago Goldstone Canberra Madrid NASA Japan ============================================================= 33 24 0 2 0 12 38 32 34 31 0 2 0 5 38 36 5.3 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2001/01_31)---- 211 46 1119 not received requested 02-Aug Closed/ No data 213 46 1257 not received requested 14-Aug Closed/ No data 213 46 1438 not received requested 14-Aug Closed/ No data 216 46 0933 not received requested 14-Aug Closed/ No data 216 46 1254 not received requested 14-Aug Closed/ No data 218 80 1154 corrupted tape requested 15-Aug Closed/ correct data 221 80 1332 not received requested 15-Aug Closed/ correct data 224 80 1006 missing data tape requested 15-Aug Closed/ 6136 block At AOS 11meter receivers would not lock to the spacecraft downlink signal. Appears there is problem with the reference that feeds the down coverter synthesizer. 6. KSC Pass Conflicts and Schedule No conflicts. 1 pass will be lost for HALCA. ------------------------------------------------------------------------------ 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC : H. Takasaki & N. Narukage KSC : J. Kuwabara & S. Masuda The STT Timer Setting is due on Tuesday 21-Aug-01 (UT) 7.3 Holiday Schedule The next holiday is 26-Aug-01 (JST). The 34m-antenna operations are scheduled for pass 2 (14:18 (UT)) and pass 5 (19:23 (UT)). The contents of the operation is downlink only. 7.4 STT MAP operation in OP (see 8.10) The STT MAP operation by OP has been stopped in these days. 7.5 The OP and the command sheets on 20-Aug-01 Today's (20-Aug-01 (UT)) OP and command sheets are prepared, but have not been checked yet. 7.6 Others (1) The air conditioner of KSC-MS has been repaired on August 18. Normal operations with 20m antenna system will be done this week. (2) HXT fine gain adjustment is scheduled at pass 1 on Monday. (3) August 25 NASDA plans to launch the H-IIA rocket from Tanegashima island on August 25. This will not affect on Yohkoh tracking at KSC unless the launch schedule is delayed. (4) August 29 - September 12 There is a NAO/ISAS balloon flight for detection of a flare hard X-ray spectrum. The observation window is from August 29 to September 12. Yohkoh plans a full support operation for this special observation. Check the DSN schedule carefully!! ------------------------------------------------------------------------------ 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 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. 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]