SSOC Tohban's Report for Week 02 (04-Jan-99 -- 10-Jan-99) SSOC : J. Sato & H. Hara KSC : Y. Iizuka & Y. Kato 0. Meeting Attendance Fujiki, Hara, McKenzie, Saito, Sterling, and Watanabe ----------------------------------------------------------------------- 1. Solar Activity Solar activity was decreased from the mid of week 02. Unfortunately an X or M class flare was not detected, however, many C-class flares occurred. The most intense flare (6-JAN-99 23:59:00, C8.0) among them was detected from the beginning to the peak with Yohkoh. ----------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded in week 02. ===================================================== UT Time Pass Table ID ===================================================== 06-JAN-99 00:53 3 990105 P3 DARKCAL 06-JAN-99 20:02 1 990106 P1 ARS1 DIFF 06-JAN-93 23:27 1 990106 P3 ARS1 STD 07-JAN-93 20:18 2 990107 P2 ARS1 STD 08-JAN-93 20:34 2 990108 P2 ARS1 STD ===================================================== 2.2 STT timer setting The STT timer was set during pass 2 (990105-1547) on 06-Jan-99 (Tuesday UT). The next timer setting should be on 12-Jan-99 (Tuesday UT). ---------------------------------------------------------------------------- 3. Errors and Problems 3.1 BCS Errors None. 3.2 SXT Errors None for week 02. The bit map error was found at the first contact on 10 Jan, and the error was cleared by Yobi-C command at the same contact. 3.3 BDR Anomaly None. 3.4 Response about absence of Telemetry Downlink at Madrid (DOY 349) As for DSN problem which appeared in week 51, we received an e-mail from DSN. Following message comes; >It seems that the tracking predicts were not very accurate and we acquired >the S/C in a side lobe. This was evident for the downlink signal was the >same in the main and acq systems. Tried to bring the S/C to the main lobe >by acq track but was unsuccessful, probably, the acq error was too large. ---------------------------------------------------------------------------- 4. Special Operations None. ---------------------------------------------------------------------------- 5. DSN Communications 5.1 DSN Schedule The following DSN passes were added/deleted: =================================================================== DSN Schedule Week Schedule Changes =================================================================== Final 03 0 passes deleted Preliminary 04 10 passes deleted Strawman 05 35 passes deleted =================================================================== Preliminary & Strawman schedules came on Saturday. The cancellation procedure for w05 strawman schedule was made in the morning of Monday. 5.2 Data Transmission from DSN -(Refer to /home/flare1/yohkoh/dsn_corrupt/99_02)-------------- *340 66 2103 not received Requested 15 Dec no response Requested 18 Dec no response Requested 22 Dec no response Requested 25 Dec *340 66 2244 not received Requested 15 Dec no response Requested 18 Dec no response Requested 22 Dec no response Requested 25 Dec 356 76 2141 not received Requested 28 Dec no response Requested 05 Jan Closed/ correct data(07-Jan) 006 76 1528 29% corrupted tape Requested 08 Jan ---------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In week 02, we gave 3 passes to ASCA, and 4 passes to AKEBONO. In week 03, we gave 7 passes to ASCA. ---------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for week 03 (11-Jan-99 -- 18-Jan-99) OP and command sheets for Monday are already prepared. SSOC : K. Fujiki, Y. Saito KSC : H. Ishizaki, Y. Iizuka ---------------------------------------------------------------- 7.2 STT timer setting The next timer setting should be done on Tuesday, 12-Jan-99 (UT). ---------------------------------------------------------------- 7.3 Holiday Schedule The holiday in week 03 will be on Sunday, 17-Jan-99 (JST). ---------------------------------------------------------------- 7.4 Manual and Checksheet A new version of the English Tohban Manual was generated during week 98_36, along with a corresponding new Tohban Checksheet. The new (and all future) Tohbans are requested to note any changes or mistakes in the manual, and to notify A. Sterling of any changes. If the changes involve the DSN procedures or the ~yohkoh/wallops/README file, Hugh Hudson san should also be notified. Current Version Yohkoh Tohban Duties Manual Rev. 4-Sep-98, A. Sterling README (Manual for Wallops/DSN Operations) Ver.5.2 28-Sep-98, H. Hudson The Japanese SSOC Tohban Manual was also modified on 23-Nov-98 by Ishii and Ichimoto. ---------------------------------------------------------------- 7.5 Some Problems in OP_FIRST_GUESS - DSN passes In some cases, OP_FIRST_GUESS fails to pick up DSN passes (See Section 8.3). Tohbans should check OPs and DSN schedules carefully. - Maximum Elevation Owing to a difference in the supposed Yohkoh maximum elevation between command sheet (78.6 degree) and weekly satellite schedule (82.5 degree or 80.1 degree in AOSLOS), 20m antenna at KSC had to be rotated suddenly in the second pass on Dec. 4 (981204-0929). As a result, a part of data was lost during the rotation. Tohbans should use parameters written in the weekly satellite schedule made by NASDA, which are the most reliable. ---------------------------------------------------------------- 7.6 DSN Santiago Station DSN Santiago Station(#74) has been not available since 1 Oct. 1998. ---------------------------------------------------------------- 7.7 DSN Pass Additions (from week48_98 report) Yohkoh loses DSN passes as follows: 1) Canceled due to conflicts with ASCA 2) Canceled because Santiago is unavailable 3) Canceled by the SSOC tohbans 4) Deleted by DSN The tohbans could compare the STRAWMAN, PRELIMINARY and FINAL schedules for a given week to see if some of the passes lost by case (4) could be replaced by ones from case (3). This means that it might be possible to request pass additions for the PRELIMINARY and FINAL week schedules from among the requested STRAWMAN cancellations (case (3)). The routine to use is ADD_DSN: e.g., IDL> add_dsn, 49 Decide on the complete list of passes to be added and select them like cancel_dsn. Then ftp and email the appropriate file. 7.8 Mainframe operation schedule between the end of this year and the beginning of next year The year-end tracking of Yohkoh is scheduled at 2:25UT on 31 Dec. 1998. New year tracking of Yohkoh will start at 21:13UT on 4 Jan. 1999. 7.9 One digit week number In some idl procedures, week numbers are assumed to be two digits. However, FTPed files have only one digits in early weeks of the year (1-9). Please rename the file numbers or change the idl procedure. ---------------------------------------------------------------------------- 8. Action Items 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. PRINT_OGALL still does not work well. Hudson will fix it. ---------------------------------------------------------------- 8.3 Week-37-98-AI??-1 / "Possible OP_FIRST_GUESS Problem." / ?? / status ?? --- Quote from W37-98 SSOC Report --- OP_FIRST_GUESS failed to pick up a couple of passes from the solass.w37 DSN schedule last week. Here is an example: . . 251 2159 2224 2238 2248 DSS-76 SOL R TKG PASS 8036 xxxxxx- xxx *---------- *WED 09 Sep *---------- 252 2342 0007 0020 0030 DSS-76 SOL R TKG PASS 8037 xxxxxx- xxx 252 0125 0150 0201 0211 DSS-76 SOL R TKG PASS 8038 xxxxxx- xxx 252 1852 1917 1929 1939 DSS-76 SOL R TKG PASS 8049 xxxxxx- xxx In this case, the missed pass was the one beginning at 0007. The problem seems to be that the DSN START time and the BOT times are for different DOY dates. We edited the solass.w37 file so that this line read: 251 2342 0007 0020 0030 DSS-76 SOL R TKG PASS 8037 xxxxxx- xxx OP_FIRST_GUESS then was able to pick up this pass. The other pass that OP_FIRST_GUESS missed had a similar form and was handled in the same way. We notified Jim Lemen of this problem. He hopes to look into this problem over the next couple of months. (We wonder if this problem has occurred in the past??) In the meantime, the tohbans will have to be on the lookout for this sort of problem. ---------------------------------------------------------------- 8.4 Week-48-98 / DSN Pass Additions Procedure / Sterling / OPEN Sterling-san will contact Ogawara-san and Lemen-san to determine a procedure acceptable to DSN to be used for DSN Planning (check policy regarding Wallops passes) and Pass Addition Requests. ---------------------------------------------------------------- === END ===