SSOC Tohban's Report for Week 14 (30 Mar 1998 - 5 Apr 1998) SSOC : S. Sano, Y. Iizuka KSC : S. Nagata, K. Kobayashi 0. Meeting Attendance Operation meeting was not held, beacuse of CDAW3. 1. Solar Activity Activity was much lower than last week. There were about 6 C-class flares, but nothing higher. However, a bright active region is coming into view on the western limb. GOES ground level rose slightly over the week to just below C level. 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded last week. ---------------------------------------------------------------- Pass ID Pass Table ID ================================================================ 980330-0928 3 980330 P3 ARS1 STD 980331-0929 4 980331 P4 ARS1 3x2 PFI 980401-0930 4 980401 P4 ARS1 DARKCAL 980402-0827 3 980402 P3 ARS1 DIFF 980403-0721 2 980403 P2 ARS0 TWO PFIS 980403-1031 5 980403 P5 ARS1 STD 980404-0825 3 980404 P3 ARS1 STD ---------------------------------------------------------------- 2.2 STT timer setting STT timer was set at Pass 3 (980331-0826) on 31-Mar (Tuesday). 2.3.1 HXT Calibration None 2.3.2 BCS Calibration None 3. Errors and Problems 3.1 SXT Errors and Problems None 3.2 BCS Errors None 3.3 Orbital Elements transmission trouble. None 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 W14 3 passes deleted by SSOC Final W15 0 passes deleted by SSOC Preliminary W15 7 passes deleted by SSOC Preliminary W16 Strawman W16 64 passes deleted by SSOC Strawman W17 ------------------------------------------------------------------- 5.2 Data Transmission from DSN 078 17 1249 corrupted Requested 27 Mar Closed/ same data 081 17 1344 corrupted Requested 27 Mar no response Requested 01 Apr 081 76 0519 corrupted tape Requested 01 Apr 081 74 1545 not received Requested 02 Apr 082 74 1422 corrupted tape Requested 01 Apr 087 66 2308 not received Requested 01 Apr 088 66 2326 not received Requested 01 Apr /home/flare1/yohkoh/dsn_corrupt/98_14 made by Seko-san 6. KSC Pass Conflicts and Schedule In week 14, 6 passese were lost to 20m antenna maintenance. None were lost due to conflicts with other satellites. In week 15, one pass will be lost to 20m antenna maintenance on Monday. This will be the last of the current maitenance sequence. No passes will be lost due to conflicts in week 15. 7. Hikitsugi Items 7.1 Tohbans for week 14 SSOC : K. Hori, Watanabe_Te et al. KSC : S. Sano, Nakagawa 7.2 OP and Command Sheets for Monday The OP and Command Sheet for Monday have been sent to KSC. The approved OP has not been transferred to KSC yet. 7.3 STT timer setting STT timer setting is due on 7 April, Tuesday. 7.4 Cancellations of the Strawman Schedule for week 17. The strawman schedule for Week 17 was received on Saturday. The task is left to the next SSOC Tohbans. 7.5 Cancellations of the Forecast Schedule for week 16. The strawman schedule for Week 16 was received on Sunday. The task is left to the next SSOC Tohbans. 7.6 Holiday Schedule The next holiday will be on 12 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?). === END ===