SSOC Tohban's Report for Week 10 (1 Mar 1998 - 8 Mar 1998) SSOC : T. Yoshida & H. Hudson KSC : M. Ohyama 0. Meeting Attendance Shibasaki, Sterling, Sawa, Hudson, Kosugi, Yang 1. Solar Activity Solar activity rose to a considerably higher level, with numerous C-class flares. Yohkoh entered flare mode three times during the KSC data intervals. A new active region at the extraordinarily high latitude of 48 degrees N just rotated onto the disk at week's end - see the SXT "science nugget" for a discussion of this (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 ================================================================ 980303-0101 2 980303 P2 ARS1 STD+DIFF 980303-0308 4 980303 P4 ARS1 STD 980304-0102 2 980304 P2 ARS1 DARKCAL 980304-0309 4 980304 P4 ARS1 STD 980305-0206 4 980305 P4 ARS1 STD 980306-0103 3 980306 P3 ARS1 STD 980307-0104 3 980307 P3 ARS1 STD ---------------------------------------------------------------- 2.2 STT timer setting STT timer was set at Pass 3 (980303-0205) on 3-Mar (Tuesday). See the note (3.4) about irregularities here. 2.3 HXT & BCS Calibrations 3. Errors and Problems 3.1 SXT Errors and Problems None 3.2 BCS Errors None 3.3 Flare 4 at KSC Yashiro_san succeeded in fixing flare4, which is back on line. 3.4 STT support software problem An error was discovered this week during the STT timer setting. The new orbital elements (24-Feb-98) were rejected. The problem was overcome temporarily by using the elements from 17-Feb-98. Still the software still had a small problem, but probably it is OK. Katano_san analyzed the situation, and found that the software had reached its upper limit. She has now fixed this problem, but dates later than year 2000 will not be accepted. This is a long-range hikitsugi! There should be no problem next week. 4. Special Operations There were no special operations this week. 5. DSN Communications 5.0 RASM use discontinued As of this week, we are dropping the DSN scheduling support, including the odious RASM system. This means that tail_dsn will not work, and $DIR_GEN_ORBIT_RAW will not contain useful schedule information. As explained in the README file (flare20/wallops) we are temporarily doing everything via new versions of the DSN-related software, all found on the same directory. We will try to automate this to get back to the same comfortable level we had before, so please be patient and/or help. 5.1 DSN Schedule Passes were deleted by DSN and SSOC Tohbans as follows. ------------------------------------------------------------------- DSN Schedule Week Deleted Passes =================================================================== Final W10 2 passes canceled by SSOC Final W11 7 passes canceled by SSOC Preliminary W12 2 passes canceled by SSOC Strawman W13 91 passes canceled by SSOC ------------------------------------------------------------------- 5.2 Data Transmission from DSN 048 76 0030 corrupted Requested 24 Feb Closed / same data 054 76 1927 corrupted tape Requested 02 Mar Closed / correct data 055 46 1721 corrupted Requested 02 Mar no response Requested 04 Mar *057 76 2021 corrupted tape Requested 02 Mar Closed / same data 057 76 2204 corrupted tape Requested 02 Mar Closed/ correct data 058 46 1308 not received Requested 04 Mar 061 16 2307 corrupted Requested 04 Mar *DOY-57 76 2021 (WPS Email)-- The data taken on Solar doy 57 1956 id 5155 was corrupted due to the antenna going into limits-a problem report will be forthcoming. made by Seko-san Note added by SSOC: The WPS operations error on DOY 57 was quite alarming, because it contained the 3rd and best eclipse data. The error resulted in a gap just at the wrong moment! But we had scheduled a second dump of these data, and after some substantial effort by Shimizu_san, Seko_san, and the Sirius staff, we were able to use the data from the second dump. They were perfect. 6. KSC Pass Conflicts and Schedule In week 9, 4 passes were lost due to HALCA operation and 2 passes due to AKEBONO. In week 10, 5 passes will be loast due to HALCA operation and 6 passes due to AKEBONO. 7. Hikitsugi Items 7.1 Tohbans for week 11 SSOC : H.N. Yang, K. Shibasaki KSC : Watanabe_Te(-15), S. Kubo 7.2 OP and Command Sheets for Monday The OP and Command Sheets 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 10 March, Tuesday. 7.4 Holiday Schedule The next holiday will be on 15 March, Sunday. 7.5 DSN-related software. The current versions reside in ~yohkoh/wallops on flare20. Routines hacked this week include cancel_dsn, dsn_check, and dsn_conflict 7.6 Tohban CHECKLIST An interim version has been made, reflecting the handover from DSN to Wallops for NASA ground-station support activities. Please use this version and comment to Hudson if it has errors. 7.7 New database 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! ===================================================================== || 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) 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 -----------------------------------------------------------