SSOC Tohban Report for Week 49 (03-Dec-2001 -- 09-DEC-2001) SSOC Tohbans : N. Shinohara T. Shimizu KSC Tohbans : K. Kawamoto K. Shinoda 0. Meeting Attendees Khan, Kosugi, McKenzie, Ogawara, Sato, Shimizu, Suzuki, Yoshimura ------------------------------------------------------------------------------ 1. Solar Activity The solar activitiy is almost low. A large number of microflares have been observed in several active regions located on the disk, but the number of M-class flares seen in GOES X-ray plot is only 3 in the period from 3 Dec to 9 Dec. No FL mode is found in the KSC downliked data. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ==================================================================== Monday PM 03-DEC-01 14:34 3 011203 P3 ARS1 DARK Tuesday PM 04-DEC-01 11:07 1 011204 P1 ARS1 STD Wednesday PM 05-DEC-01 11:01 1 011205 P1 ARS1 DIFF Thursday AM 05-DEC-01 16:04 4 011205 P4 ARS1 STD* Thursday PM 06-DEC-01 10:55 2 011206 P2 ARS1 STD Friday PM 07-DEC-01 12:30 3 011207 P3 ARS1 STD Saturday PM 08-DEC-01 12:24 3 011208 P3 ARS1 STD ==================================================================== 2.2 STT Timer Setting The STT timer was set at pass 3 on Tue 04-Dec-2001 (JST). ------------------------------------------------------------------------------- 3. Special Operation: 3.1 Normal pointing update OG#20 was updated and issued on Sat 08-Dec-2001 (011208-0929) to change the normal pointing to W1.49 N2.74. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors : Shutter Error was detected on pass 011206-0826. Recovery was performed successfully in the next pass (011206-0929). 4.2 DP Errors : None 4.3 BCS Errors : None 4.4 Software problem KSC tobans reported that "find_longest" and "rdtbl" do not work properly this week. Note that these IDL softwares (by Kano) is to find the longest SXT exposures for the daily operation reports. It turned out that a SSW program used in IDL startup file of flare 1 "sxt" account does not work with syntax error. After modifying the startup file, they work properly now. Closed. ------------------------------------------------------------------------------- 5. NASA Station Schedule 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred: ========================================================================= Week Schedule Changes ======================================================================== Real-Time 49 0 cancellations 0 additions requested Final 50 2 cancellations, 3 additions requested (1 accepted) Preliminary 51 1 additions requested by SSOC Strawman 52 23 cancellations ========================================================================= 5.2 Contacts this week and next (see 8.12): Week Wallops Santiago Goldstone Canberra Madrid NASA Japan 49 30 5 0 0 8 43 25 50 31 5 0 2 2 40 27 5.3 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2001/01_49)---- 317 82 1651 not received requested 29-Nov no response 04-Dec 325 80 0929 not received requested 29-Nov no response 04-Dec 327 80 1100 corrupted tape requested 29-Nov Closed/ correct data 331 82 1040 corrupted tape requested 04-Dec ------------------------------------------------------------------------------ 6. KSC Pass Conflicts and Schedule : 8 conflicts (6 for HALCA and 2 for AKEBONO) : 5 conflicts (4 for HALCA and 1 for AKEBONO) ------------------------------------------------------------------------------ 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC Tohbans : Morimoto & Suzuki_I KSC Tohbans : K. Shinoda & Kichiraku 7.2 STT Timer Setting The STT Timer Set is due on Tuesday 11-Dec.-2001 (JST). 7.3 Holiday Schedule The next holiday is Sunday 16-Dec-2001 (UT). 7.4 The OP and the command sheets for today The OP and command sheets for Monday (10 Dec. JST) were already prepared and checked by SSOC and KSC tohbans. The OP has been transferred to KSC this morning. 7.5 KSC 34m Ranging Testing A few number of DC uplinks from the 34m system and downlinks via the 20m system will be perfomed in the following two passes dedicated to the testing. 11-Dec-01 13:49-14:03 UT and 12-Dec-01 12:02-12:16 UT See the test plan (in japanese) for details. 7.6 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. We noticed several problems last week with the schedules from WOTIS and future tohbans are advised to be vigilant in checking the schedules. --We found WOTIS confused the DOY in an addition request -requiring an urgent cancellation request. --We also found that some schedules did not have the Change Log properly labeled requiring manual editing of the files to be able to read them with op_first_guess. (WOTIS headed both sections under separate headings of ACTIVITIES LISTING -watch out for this in the future). 7.7 SXT tohban contact The SXT_COs have moved from D-toh to new A-toh 7F. New phone number is ex. 8466, and fax number is 8469. 7.8 Long term schedules (1) 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. (2) 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]