SSOC Tohban's Report for Week 13 (23 Mar 1998 - 29 Mar 1998) SSOC : S. Morita KSC : K. Shinoda & Y. Iizuka 0. Meeting Attendance J. Khan, R. Kano, K. Kobayashi, N. Nitta, T. Watanabe and S. Morita 1. Solar Activity Solar activity is a little lower than last week. But 3 M-Class flares and some sub-M-class flares occurred. 4 of these flares are LDE. Goes back ground level is higher than B. At the start of last week, this back ground level was near the C. (ftp://isass0.solar.isas.ac.jp/pub/sxt_co/SXTweekly.html). 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded last week. ---------------------------------------------------------------- Pass ID Pass Table ID ================================================================ 980323-1135 3 980323 P3 ARS1 STD 980324-1135 4 980324 P4 ARS1 DIF 980325-1032 3 980325 P3 ARS1 STD 980327-1033 4 980327 P4 ARS1 STD 980328-1031 3 980328 P3 ARS1 STD ---------------------------------------------------------------- 2.2 STT timer setting STT timer was set at Pass 2 (980324-0928) on 25-Mar (Wednesday). 2.3.1 HXT Calibration HXT Calibration was done 4 times, and the gain adjustment was done succesfully. ---------------------------------------------- Pass ID Pass ============================================== 980323-1135 3 Fine Gain Adjustment 980325-1136 4 HXT CAL 980326-0929 3 HXT CAL 980326-1033 4 HXT CAL ---------------------------------------------- 2.3.2 BCS Calibration BCS Source Calibration : It was done about 18:39 on 24th, Mar, 1998 (UT). BCS Stim Calibration : It was done at Pass4, 980324-1135, on the 24th, Mar, 1998 (UT). 3. Errors and Problems 3.1 SXT Errors and Problems None 3.2 BCS Errors Two BCS Errors were found at pass2 on Mar 25 Wed (980324-0928) and at pass2 on Mar 28 Sat (980327-0827). Both of them were successfully recoverd during the next passes. 3.3 Orbital Elements transmission trouble. On March 25 Wednesday, the OLD orbital elements were loaded into the SIRIUS data base instead of NEW elements. This trouble was caused by resetting miss with software updating on GS8400/10 at ISAS. At 19:20JST on Mar 26, GS8400/10's data was recovered, and new orbital elements were loaded. 4. Special Operations There were no special operations this week. 5. DSN Communications 5.0 RASM use discontinued NASA ground-station support activities has handed over from JPL to Wallops from mid week10. All the DSN related works should be done using routines under flare20/wallops. The new system uses e-mail and FTP instead of RASM. Temporal manual for the new system is in flare20 /wallops/README file. Please use this version and comment to Hudson san if it has errors. 5.1 DSN Schedule Passes were deleted by DSN and SSOC Tohbans as follows. ------------------------------------------------------------------- DSN Schedule Week Deleted Passes =================================================================== Final W13 6 passes deleted by SSOC Final W14 6 passes deleted by SSOC Preliminary W15 3 passes deleted by SSOC Strawman W16 It is not yet received. ------------------------------------------------------------------- 5.2 Data Transmission from DSN 076 17 1355 corrupted Requested 19 Mar Closed / same data 076 17 1538 corrupted Requested 19 Mar Closed / same data *077 16 1231 not received Requested 26 Mar Closed / No data 078 17 1249 corrupted Requested 27 Mar 081 17 134 corrupted Requested 27 Mar *There was no data for this support from DSS16. DR#G03514.(CDR Email 27-Mar) ## DOY-081 S 1910 (WPS Email)--Only 7642 blocks received due to antenna failure. DOY-084 S 1318 (WPS Email)--52 drops during the pass. /home/flare1/yohkoh/dsn_corrupt/98_13 made by Seko-san 6. KSC Pass Conflicts and Schedule In week 13, 1 passe was lost due to AKEBONO operation, and 6 passes due to 20m antenna maintenance. In week 14, 6 passes will be lost due to 20m antenna maintenance. The antenna maintenance will last one more weeks (W12 - W14). 7. Hikitsugi Items 7.1 Tohbans for week 14 SSOC : Nagata and Kobayashi KSC : Iizuka and Sano 7.2 OP and Command Sheets for Monday The OP and Command Sheet for Monday have been sent to KSC. The approved OP has also been transferred to KSC. 7.3 STT timer setting STT timer setting is due on 31 March, Tuesday. 7.4 Cancellations of the Strawman Schedule for week 16. The Strawman Schedule for week 16 is not yet received on this Monday morning(JST). The task is left for the new SSOC tohban. 7.5 Holiday Schedule The next holiday will be on 5 April, Sunday. ===================================================================== || The following is the same as the previous week's report. || ===================================================================== 8.1 DSN scheduling From this year, Wallops schedules DSN passes, instead of JPL. The system to communicate with Wallops is still under construction. For details, see README in the subdirectory "wallops" in flare20. All DSN-related software should be run from an IDL session in this directory. 8.2 Bug in op_first_guess (Quoted from the previous week's report) SSOC tohbans should be aware of a bug in op_first_guess: "% OP_START_END: Problem with detection of LOS/AOS/DSN Repro Events" appears when we have close enough contacts (more than two downlinks in an orbit). We avoided the problem, when using op_first_guess, by responding to "Change any standard op_first_guess options?" by choosing yes, then in response to "Enter BDR optimization (1 or 2), by choosing 1. 8.3 BDR trouble (See 'DP error' in "SSOC Tohban's Report for Week 02" in 1998.) A DP error (error code = 90 ->75) was found during the data dump at 980106-0411. 2 of 20 BDR blocks are not accessible. As a result, the capacity of BDR is at the moment nine tenth of the normal capacity. As far as we know this error has not been recovered yet. Please note the special commands now routinely appearing in the command sheets. This is part of the recovery attempt. 8.4 E-mail communications (Quoted from the previous week's report) We rely upon e-mail more and more. For operations-related e-mail, it's hereby suggested that we make it a rule to ACKNOWLEDGE the receipt of any such e-mail message. This applies particularly among SSOC, SXT_CO, KSC and SXT_ST. 8.5 Long Range Schedule Arrangement (W49-1997) Since the launch of HALCA, the KSC tracking facilities have been running in operation nearly twenty four hours a day. No time has been available yet for maintenance this year. NEC and MELCO are planning to reserve a pair of two- week periods for maintenance with both of these two-week intervals occurring before the end of March 1998. The work requires six consecutive hours each day. Candidate periods; 17-31 of January and 16-31 of March, During these periods, we will perhaps lose one contact per day at KSC. Also, Planet-B will be launched next summer. In spite of the fact that Planet-B is a Japanese mission, it will be launched during summertime; its launch window starts July 4, 1998 for the mission to Mars. During the flight operation (lasting for the twenty six days before the launch window begins), the KSC 20-meter antenna system will be used. After the launch, Planet-B will be tracked by the USD 64m and the newly (to be) installed KSC 34m antenna. Tracking scheduling during the Planet-B flight operation interval will be negotiated among the five teams namely: AKEBONO, YOHKOH, ASCA, HALCA and Planet-B (in March, perhaps). Tetsuya WATANABE (NAOJ) 8.6 New database (W10-1998) R. Bentley and S. Freeland have apparently finished installing a new and very convenient database in the Yohkoh system. It is "orb" and one gets orbit data from it via IDL> rd_orb, t1, t2, orb IDL> utplot,orb,orb.height,/ynoz ; for example Now at last we know where the satellite was at all times! (Hudson) 9. Action Items (Same as last week's SSOC Report) 9.1 Further software development. Status CONTINUING. It would be greatly appreciated if the SSOC tohbans could recommend any software development that they think will save future tohbans time and which improves the reliability of their work. 9.2 Week-48-A/I-1 /Hudson/status AJAR. Hudson has fixed print_ogsel (Week 48). Upon editing the OG's, this command from IDL will print the edited OG item on the workstation printer in B-toh. PRINT_OGALL still does not work well. Hudson will fix it next. After the corrections are made, these procedures should be incorporated into the tohban manual. 9.3 Week-10-A/I-1 /Hudson, Lemen/status OPEN DSN_CONFLICT does not work with the new Wallops files. It needs fixing before the next conflict season starts (perhaps in May?).