SSOC Tohban Report for Week 47 (19-Nov-2001 -- 25-Nov-2001) SSOC Tohbans : A. Takeda, M. Kubo KSC Tohbans : N. Kawano, H. Sekiguchi 0. Meeting Attendees T.Watanabe, Y.Ogawara, A.Takeda, D.Mchenzie, J.Sato, J.Khan, K.Yoshimura ------------------------------------------------------------------------------ 1. Solar Activity Flare activity was not so high except 3 M-class flares reported on the late 22nd (UT). Two of them (M1.2 and M9.9) came from a sigmoid region, NOAA 9704, accompanied by strong proton flux which lasts a few days. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ==================================================================== Monday AM 18-NOV-01 20:58 2 011118 P2 ARS1 STD* Tuesday AM 19-NOV-01 19:11 1 011119 P1 ARS1 DIFF* Tuesday AM 20-NOV-01 00:15 4 011119 P4 ARS1 STD* Wednesday AM 20-NOV-01 17:27 1 011120 P1 ARS1 DARK* Wednesday AM 20-NOV-01 22:29 4 011120 P4 ARS1 STD* Thursday AM 21-NOV-01 19:02 2 011121 P2 ARS1 STD* Friday AM 22-NOV-01 20:38 3 011122 P3 ARS2 STD* Saturday AM 23-NOV-01 18:52 2 011123 P2 ARS2 STD* Sunday AM 24-NOV-01 20:28 4 011124 P2 ARS1 STD* ==================================================================== 2.2 STT Timer Setting Now that the period of the Canopus eclipse is approaching, we had to adjust the STT timer twice in this week. 20-Nov-2001 Tue.(JST) in pass 2 (011119-1342) and 25-Nov-2001 Sun.(JST) in pass 2 (011124-1135). The STT timer will be shutdown on the next Monday, pass 1. ------------------------------------------------------------------------------- 3. Special Operation: 3.1 OG-114 and OG-115 The OG-114 and OG-115, which had been modified for precaution of the Leonids, were returned to the original version and uploaded at pass 1 of the 20th JST (011119-1239). 3.2 SXT normal pointing update Normal pointing update was requested and done in pass 1 on Wednesday JST. (011120-1135). 3.3 HXT calibration HXT calibration was performed during the following passes. Nov. 23 (UT) pass 1 (011123-1135) Nov. 23 (UT) pass 2 (011123-1238) Nov. 24 (UT) pass 3 (011124-1238) ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors : SXT stopped observation from 16:22 UT of Nov. 22, without any error status returned. The situation was analyzed by a super toban, Hara-san and an SXT_CO, Sato-san, and they decided to upload the Yobi-B commands in pass 1 of the 24th UT, (011124-1031) in order to perform a hard reset. Since SXT returned proper responses, the SXT recovery plan was carried out in the next pass (011124-1135). After the recovery plan, SXT returned a WM RST error. According to Hara-san's instruction, KSC tobans tried the recovery plan again in the following two pass (011124-1238 and -1341). After those procedures, the error was cleared and SXT has resumed normal obervation. 4.2 DP Errors : None 4.3 BCS Errors : A MEM CHK SUM error was found during 011121-0001. Since it was the 5th pass, and the elevation was not high enough, the recovery was carried out in the 1st pass of the next day (011121-1135). The error was cleared during the pass. 4.4 20m antenna in trouble : A trouble was found with the 20m antenna at KSC in its motor system. Although maintenance stuffs have started to replace it, we are forced to use 34m antenna until 27th Nov. The operations with 20m antenna are to be resumed from the 1st pass of the 27th UT (011127-1031). ------------------------------------------------------------------------------- 5. NASA Station Schedule 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred: ========================================================================= Week Schedule Changes ========================================================================= Real-Time 47 1 cancellations 0 additions requested Final 48 2 cancellations 1 additions requested (but rejected) Preliminary 49 0 cancellations 5 additions requested (4 of them are accepted) Strawman 50 64 cancellations ========================================================================= 5.2 Contacts this week and next (see 8.12): Week Wallops Santiago Goldstone Canberra Madrid NASA Japan 47 23 0 0 0 4 27 39 48 26 0 0 0 12 38 22 5.3 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2001/01_46)---- 302 74 1246 not received requested 07-Nov no response requested 12-Nov no response requested 14-Nov 305 82 1928 not received requested 12-Nov no response requested 14-Nov ------------------------------------------------------------------------------ 6. KSC Pass Conflicts and Schedule : No conflict : 10 conflicts (4 for HALCA and 6 for AKEBONO) ------------------------------------------------------------------------------ 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC Tohbans : J. Khan, Y. Sakamoto KSC Tohbans : H.Sekiguchi, K. Kawamoto 7.2 STT Timer Setting Since the period of Canopus eclipse is about to start, the STT Timer should be shut down on Monday 26-Nov-2001(JST), in pass 1(011126-1031). It will last until 1st December. 7.3 Holiday Schedule The next holiday is Sunday 2-Dec-2001 (UT). The 34m-antenna operations are scheduled in two passes, starting from 12:59 UT and 18:03 UT, respectively. These operations will be downlink only. 7.4 The OP and the command sheets for today The OP and command sheets for Monday (26 Nov. JST) were already prepared and checked by SSOC and KSC tobans. The OP has transfered to KSC. 7.5 DSN downlink scheduling handover White Sands (WOTIS) took over the responsibility for the Yohkoh DSN downlink scheduling. From W46, all DSN contacts should be made through WOTIS. 7.6 SXT tohban contact The SXT_COs have moved from D-toh to new A-toh 7F. New phone number is ex. 6162, and temporary fax number is 8526. 7.7 Long term schedules (1) 34m Ranging Testing A few number of DC uplinks from the 34m system and downlinks via the 20m system will be possible in the following two passes dedicated to the testing. 11-Dec-01 13:51-14:04 UT and 12-Dec-01 12:04-12:18 UT (2) Year-end and Year-begin Yohkoh operation ends at 29-Dec-01 5:18- 5:30 UT and resumes at 4-Jan-02 20:07-20:19 UT. (3) DASH Launch A piggyback mission DASH will be launched by HIIA at 3:00 UT, 31-Jan-02. Both 34m and 20m dishes at KSC will stand-by as ain and "hot-backup" systems from Y-9 to Y+3 days. A few schedule conflicts with Yohkoh operation will be adjusted at the next meeting in January. ------------------------------------------------------------------------------ 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 2000Jan. 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]