SSOC Tohban's Report for Week 51 (14-Dec-98 -- 20-Dec-98) SSOC : K. Kobayashi & S. Tsuneta KSC : Y. Nishino & Y. Nakagawa 0. Meeting Attendance ---------------------------------------------------------------------------- 1. Solar Activity We have occasional C-class flares with two M-class flares. M-3 flare at 7:45UT in December 17 was not observed due to S/C night. M-8 flare that occurred 17:22UT in December 18 may be partially observed. (GOES plot does not show the peak of this flare.) See SXT chief observer's report for details. ---------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded in week50. ===================================================== UT Time Pass Table ID ===================================================== 14-DEC-98 10:03 3 981214 P3 ARS1 DARKCAL 15-DEC-98 10:20 3 981215 P3 ARS1 STD 16-DEC-98 08:53 3 981216 P3 ARS1 STD+DIFF 16-DEC-98 12:20 5 981216 P5 ARS1 STD 19-DEC-98 07:59 3 981219 P3 ARS1 STD 20-DEC-98 08:16 3 981220 P3 ARS1 STD ===================================================== 2.2 STT timer setting The STT timer was set during pass 1 (981215-0618) on 15-Dec-98 (Tuesday UT). The next timer setting should be on 22-Dec-98 (Tuesday UT). ---------------------------------------------------------------------------- 3. Errors and Problems 3.1 BCS Errors BCS error was found in the pass 4 of 1998 December 17, and in the pass 3 of 1998 December 19. It was recovered propoerly. 3.2 SXT Errors None. 3.3 BDR Anomaly None. 3.4 DSN From: "Pivar, Bruce" To: "'Yoshiko Seko'" The SOLAR A track on DSS66 for Day of Year 349 (AOS at 2005Z) at DSS-66had no telemetry output. Best AGC was negative 135dbm. Please do not expect a playback for this pass. (reference DR No. L02800). We have checked the op, and found no prblem. We are asking them whether this is DSN problem. ---------------------------------------------------------------------------- 4. Special Operations None. ---------------------------------------------------------------------------- 5. DSN Communications 5.1 DSN Schedule Passes were added/deleted as follows. =================================================================== DSN Schedule Week Schedule Changes =================================================================== Final 52 0 passes deleted Preliminary 01 0 passes deleted Strawman 02 many passes deleted by SSOC and some passes deleted for ASCA =================================================================== Note: We deleted many passes in the strawman of week02. However, we have not received the reply for this yet. 5.2 Data Transmission from DSN -(Refer to /home/flare1/yohkoh/dsn_corrupt/98_51)-------------- 335 76 0522 corrupted tape Requested 08 Dec no response tape Requested 14 Dec no response tape Requested 18 Dec 336 76 0539 corrupted tape Requested 08 Dec no response tape Requested 14 Dec no response tape Requested 18 Dec 336 76 0721 corrupted tape Requested 08 Dec no response tape Requested 14 Dec no response tape Requested 18 Dec 336 76 0904 corrupted tape Requested 08 Dec no response tape Requested 14 Dec no response tape Requested 18 Dec 340 66 2103 not received Requested 15 Dec no response Requested 18 Dec 340 66 2244 not received Requested 15 Dec no response Requested 18 Dec 343 76 0225 not received Requested 18 Dec 343 76 0408 not received Requested 18 Dec ---------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In week 51, we gave 3 passes to HALCA, and 5 passes to AKEBONO. In week 52, we gave 8 passes to AKEBONO, 1 pass to HALCA, 1 pass to NOZOMI, and 1 pass to ASCA. ---------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for week 52 (21-Dec-98 -- 27-Dec-98) SSOC : T. Sakao, H. Nakajima KSC : M. Nishino, Te. Watanabe ---------------------------------------------------------------- 7.2 STT timer setting The next timer setting should be done on Tuesday, 22-Dec-98 (UT). ---------------------------------------------------------------- 7.3 Holiday Schedule The holiday in week 51 will be on Sunday, 27-Dec-98 (UT). ---------------------------------------------------------------- 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 ===