SSOC Tohban's Report for Week 09 (23 Feb 1998 - 1 Mar 1998) SSOC : T. Shimizu & N. Saita KSC : S. Yashiro 0. Meeting Attendance H. Hudson, D. Mckenzie, T. Shimizu, T. Yoshida, N. Saita M. Sawa, T. Watanabe 1. Solar Activity Solar Activity has been low, although several small active regions are observed on the disk. There were a few sub-C class flares in this week. 2. Standard Operation 2.1 SXT Table Uploads The following SXT tables were uploaded last week. ---------------------------------------------------------------- Pass ID Pass Table ID ================================================================ 980223-0414 3 980223 P3 ARS1 STD 980224-0411 3 980224 P3 ARS1 STD+DIFF 980225-0411 3 980225 P3 ARS1 STD 980226-0515 4 980226 P4 ARS0 ECLIPSE 980227-0206 2 980227 P2 ARS1 DARKCAL 980227-0413 4 980227 P4 ARS1 STD 980228-0413 4 980228 P4 ARS1 STD ---------------------------------------------------------------- 2.2 STT timer setting STT timer was set at Pass3 (980224-0411) on 24 Feb(Tuesday). 2.3 HXT & BCS Calibrations There was no calibration in this week. 3. Errors and Problems 3.1 SXT Errors and Problems None. 3.2 BCS Error None. 3.3 Flare 4 at KSC flare4 has been down since 19 Feb. Yashiro-san at KSC has been working to fix the flare4 problem. He has found that the ethernet board is broken. The main part of flare6 was shipped to KSC last Tuesday for replacement. He is now working on it and will fix the problem soon. 4. Special Operation There was a special observation for eclipse on 26 Feb. Yohkoh successfully observed partial eclipses three times (although the data for the 3rd episode is not yet in SIRIUS entry). The OP for complicated operations was prepared by Kano-san. Since a DSN pass, which was planned for download of the data obtained before the 1st eclipse, was canceled the day before the eclipse day (see also 5.1), SSOC asked Wallops schedulars whether another pass is available for the download, and they gave us another pass support during the eclipse observation. 5. DSN Communications 5.1 DSN Schedule Passes were deleted by DSN and SSOC Tohbans as follows. ------------------------------------------------------------------- DSN Schedule Week Deleted Passes =================================================================== Final(RealTime) W09 1 pass canceled by SSOC Final W09 3 passes canceled by DSN(*) Final W10 18 passes canceled by SSOC Preliminary W11 0 passes cancelled by SSOC Strawman W12 80 passes cancelled by SSOC ------------------------------------------------------------------- (*) due to the COMETS critical LEOP support. Note that COMETS is identical to KAKEHASHI. 5.2 Data Transmission from DSN 045 66 2028 not received Requested 19 Feb Closed / correct data received. 046 17 0619 corrupted Requested 24 Feb Closed / same data. 048 76 0030 corrupted Requested 24 Feb 048 46 1840 not received Requested 24 Feb Closed / correct data received 049 46 2223 not received Requested 24 Feb Closed / correct data received 051 76 0107 corrupted Requested 24 Feb Closed / same data. # Reference : /home/flare1/yohkoh/dsn_corrupt/98_09 made by Seko-san 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 W10 SSOC : T. Yoshida & H. Hudson KSC : M. Ohyama 7.2 OP and Command 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 3 March, Tuesday. 7.4 Holiday Schedule The next holiday will be on 8 March, Sunday. ===================================================================== || The following is the same as the previous week's report. || ===================================================================== 7.5 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 "Temporary Manual" written by Hugh Hudson in the directory ~/wallops on flare20. 7.6 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. 7.7 Suggestion to DSN selection rule (Quoted from the previous week's report) --- mail from JPL --- I understand that you access RASM and choose the passes that are made available to you. We would like you to use the Wallops (WFF) passes as much as possible. In other words, if a pass from one of the DSN sites (Goldstone, Madrid or Canberra) can be substituted by a WFF pass, please use the WFF pass and delete the DSN pass, instead of vice versa. Please understand we are not asking you to give up any coverage but if the same coverage can be accomplished by using WFF instead of the DSN, we would like you to do so. (Albert Chang) 7.8 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. 7.9 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. 7.10 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) 7.11 Off pointing (From SXT Chief Observer : Nitta-san) If no off-pointing is planed in the current week (see SXT chief observer's report), there is no need for SSOC tohbans to ask SXT_CO whether or not offpoint should be added to the every day's command sheet. 8. Action Items (Same as last week's SSOC Report) 8.1 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. 8.2 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. -- end of report -----------------------------------------------------------