SSOC Tohban's Report for Week 12 (16 Mar 1998 - 22 Mar 1998) SSOC : K. Akita KSC : S. Kubo & K. Shinoda 0. Meeting Attendance R.Kano, S.Morita, M.Sawa, A.C.Sterling, T.Watanabe 1. Solar Activity Solar activity returned to a high level, including now some major flares. Last week we commented on the high-latitude region in the N, but there has also been an important one in the S, interconnected to another same-hemisphere region. That's the subject of this week's nugget. (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 ================================================================ 980315-1340 2 980315 P2 ARS1 STD 980316-1341 3 980316 P3 ARS1 STD 980317-1341 3 980317 P3 ARS1 STD 980318-1238 3 980318 P3 ARS1 DARKCAL 980319-1239 3 980319 P3 ARS1 STD 980320-1136 3 980320 P3 ARS1 STD 980321-1237 3 980321 P3 ARS1 STD ---------------------------------------------------------------- 2.2 STT timer setting STT timer was set at Pass 5 (980316-1547) on 17-Mar (Tuesday) but with incorrect parameters. It was set again at Pass 2 (980318-1135) on 19-Mar (Thursday) with correct parameters. (see section 3.3) 2.3 HXT & BCS Calibrations HXT Calibrations were done at the following passes. --------------------------- Pass ID Pass =========================== 980320-1136 3 980321-1133 2 --------------------------- 3. Errors and Problems 3.1 SXT Errors and Problems None 3.2 BCS Errors Error was found at Pass 2 (980321-1133) on 21 March. KSC tohbans could not complete the recovery procedure during the same Pass, and they restarted the same procedure inadvertently at Pass 3, and failed to complete again. It was recovered at Pass 4 successfully. HXT calibration was planned at both Pass 2 and Pass 3 for that day, but the latter was cancelled due to the recovery procedure. 3.3 Lost Canopus As an unexpected coordinate system change was set in the SOP/SAOCS program and was overlooked by the operators, wrong stt timer values were uploaded Tuesday morning. STT was not used till Friday morning, though we set a correct eclipse timings Thursday morning. The preserved H(orizontal), V(ertical), and S(um intensity) values of a tracked star did not show any silhouette of Canopus. But suddenly, Friday morning just when we would start the recovery operation, the satellite came in with STT tracking Canopus. Fujiwara_san of NEC told that there were a few logics in STT to identify Canopus, that though STT kept the wrong values this time, it did not use them as those of Canopus, and that the s/c Z-axis attitude therefore did not move much actually so that STT luckily caught correct Canopus. 3.4 SOP Problem The SOP/SAOCS program for calculating the STT timer values did not accept the dates after 23-Mar-98.Katano_, Seko_, and Ogasawa_sans of NEC found that this was due to the setup of the ephemeris file (JPL DE118), which was prepared as a subroutine provided by FACOM, and they extended it to 21-Jan-2000. However, this ephemeris, which is also used in GEOTAIL operation programs, cannot be extended beyond that date anymore --- This is another type of the 2000 problems. 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 W12 No passes deleted by SSOC W12 3 passes deleted by DSN Final W13 3 passes deleted by SSOC Preliminary W14 No passes deleted by SSOC Strawman W15 81 passes deleted by SSOC ------------------------------------------------------------------- 5.2 Data Transmission from DSN 055 46 1721 corrupted Requested 02 Mar no response Requested 04 Mar no response Requested 10 Mar no response Requested 13 Mar Closed / same data 058 46 1308 not received Requested 04 Mar no response Requested 10 Mar no response Requested 13 Mar Closed / correct data 076 17 1355 corrupted Requested 19 Mar 076 17 1538 corrupted Requested 19 Mar /home/flare1/yohkoh/dsn_corrupt/98_11 made by Seko-san 6. KSC Pass Conflicts and Schedule In week 12, 1 passe was lost due to HALCA operation, 5 passes due to AKEBONO, and 5 passes due to 20m antenna maintenance. In week 13, 6 passes will be lost due to 20m antenna maintenance, and 1 pass due to AKEBONO. The antenna maintenance will last two more weeks (W12 - W14). 7. Hikitsugi Items 7.1 Tohbans for week 13 SSOC : Morita KSC : Shinoda and Iizuka 7.2 OP and Command Sheets for Monday The task is left for the new SSOC tohban. The fisrt KSC contact will start at 24:17. There's plenty of time to prepare for it. 7.3 STT timer setting STT timer setting is due on 24 March, Tuesday. 7.4 Holiday Schedule The next holiday will be on 29 March, 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 of report -----------------------------------------------------------