SSOC Tohban Report for Week 41 (08-Oct-2001 -- 15-Oct-2001) SSOC Tohbans : T.Miyawaki, N.Shinohara KSC Tohbans : H.Adachi,K.Kobayashi,A.Ohto (- 9 Oct) 0. Meeting Attendees Te.Watanabe, Y.Ogawara, H.Hudson, J.Khan, N.Nitta, T.Kosui, M.Sawa, A.Takeda, K.Matsuzaki, H.Hara, H.Ishizaki, K.Yoshimura, T.Miyawaki ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was relatively low with back ground level of C1 or sub C during the week. One M-class flare, which had the long dration time, occurred at 9-OCT-01 UTC. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ==================================================================== Monday AM 07-OCT-01 19:59 3 011007 P3 ARS1 DFF* Monday PM 08-OCT-01 14:53 1 011008 P1 ARS0 DKJ* Tuesday AM 08-OCT-01 18:15 3 011008 P3 ARS1 STD* Thursday AM 10-OCT-01 18:09 3 011010 P3 ARS1 STD* Friday AM 11-OCT-01 14:43 2 011011 P2 ARS1 STD Saturday AM 12-OCT-01 14:40 2 011012 P2 ARS1 STD Saturday PM 13-OCT-01 14:37 2 011013 P2 ARS1 STD ==================================================================== 2.2 STT Timer Setting The STT timer was set during pass 3 on Tue 9-Oct-2001 (JST), (Pass ID : 011008-1237). ------------------------------------------------------------------------------- 3. Special Operation: 3.1 Y gyro check Y-gyro was turned on Thurday. Originally it was planned that the test would take place during passes 1 - 3 with SXT halt only for two s/c rotations. However, the uplink condition was not good at pass 1, and the planned OG changes were not completed. At pass 2, the ACS mode was changed to ACP SHD and Y-gyro was turned on. The current profile showed no anomalies. At pass 3, the gyro configuration was changed back to the original one, XSZ, and the ACS mode to CAQ. The data obtained at pass 3 showed that the current Y-gyro drift rate was about 13deg/H. At pass 5, the changed OGs were back to the original ones, SXT CTL to auto, and the ACS mode to FAQ, then NOR at the start of s/c day. Canopus was re-caputured during the CAQ operation between passes 3 and 5. 3.2 HXT fine gain adjustment 8 ROGs for HXT fine gain adjustment commanded on 12-Oct-01 UTC pass 1 (Pass ID : 011012-0927). ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors : A "WM RST" error occured during pass 1 on Tue 9-Oct-2001 (UT) (Pass ID : 011009-1030), and recovered on pass 3 by the SXT recovery operation. A "SHUTTER" error occured during pass 3 on Tue 9-Oct-2001 (UT) (Pass ID : 011009-1237), and recovered on pass 5 by the SXT recovery operation. Final one was NOT an error. But SXT was halted at 12-Oct-01 UTC pass 5 (Pass ID : 011012-1340), and was recoverd next day pass 1. This was because KSC tonban misunderstood the sxt observing point, which was clarified being O.K. by SXT_CO. 4.2 DP Errors : None 4.3 BCS Errors : None 4.4 DSN Tracking : No report ------------------------------------------------------------------------------- 5. NASA Station Schedule 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred: ========================================================================= Week Schedule Changes ========================================================================= Real-Time 41 2 cancellations Final 42 1 cancellations and 5 additions requested Preliminary 43 0 cancellations Strawman 44 57 cancellations ========================================================================= 5.2 Contacts this week and next (see 8.12): Week Wallops Santiago Goldstone Canberra Madrid NASA Japan 41 27 2 6 0 7 42 34 42 28 2 4 0 2 34 31 5.3 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2001/01_40)---- 270 66 0607 missing data requested 03-Oct Closed/ correct data 270 80 1054 missing data tape requested 04-Oct 275 80 0900 not received requested 11-Oct 275 80 1041 not received requested 11-Oct 276 80 0858 not received requested 04-Oct 278 80 0852 missing data tape requested 11-OCt 281 80 1023 missing data tape requested 11-Oct 280 66 0358 - 0409 : No DATA UNABLE TO MOVE THE ANTENNA TO POINT. ANTENNA WAS DECLARED RED ON DOY279 AT 2120z. 280 16 1342 - 13 LATE A.O.S---MCP CAME UP WITH SPACECRAFT#13(POLAR) VICE SPACECRAFTW64(SOLA). ***** DSN data <2001.09> ****** Total passes Acquiring rate Goldstone 6 99.99% Canberra 22 87.32% Madrid 7 97.60% Wallops 114 95.20% Santiago 5 99.98% ------------------------------------------------------------------------------ 6. KSC Pass Conflicts and Schedule : Three passes lost to HALCA. : One passes will be lost to HALCA. ------------------------------------------------------------------------------ 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC Tohbans : H.Ishizaki, H.Hara KSC Tohbans : S.Ohto, Y.Kubo 7.2 STT Timer Setting The STT Timer Set is due on Tuesday 23-Oct-2001 (JST). 7.3 Holiday Schedule The next holiday is Sunday 21-Oct-01 (JST). The 34m-antenna operations are scheduled for pass 1 (12:52 UT) and pass 4 (17:56 UT). These operations 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 Monday night (15-16 Oct JST) have been already been checked. The OP have NOT been sent to KSC (see 7.6). 7.6 KSC will resume 20m operation It must be confirmed that the change of MS of KSC to 20m system from 34m system before sending the OP to KSC. ------------------------------------------------------------------------------ 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 (Depends on azimuth. See the map on whiteboard.) 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. [end of report]