SSOC Tohban's Report for Week 49 (30-Nov-98 -- 6-Dec-98) SSOC : M. Yamaguchi, K. Hori KSC : T. Yokoyama, H. Sekiguchi, & Y. Nakagawa 0. Meeting Attendance H.Hara, K.Hori, J.I.Kahn, T. Kosugi, K.Shibasaki, Te. Watanabe, S.Watari, M.Weber, M.Yamaguchi ---------------------------------------------------------------------------- 1. Solar Activity Solar activity dropped from the last week, but many C-class flares occured in NOAA AR8395, AR8392, and AR8402. Yohkoh observed the start or gradual phase of these flares. Many bright loops were observed in AR8395 and AR8397 as PFI targets. ---------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded in week49. ===================================================== UT Time Pass Table ID ===================================================== 30-Nov-98 19:55 4 981130 P4 ARS1 DARKCAL 1-Dec-98 17:58 4 981201 P4 ARS1 STD 2-Dec-98 13:37 2 981202 P2 ARS1 DIFF 2-Dec-98 17:02 4 981202 P4 ARS1 STD 4-Dec-98 17:36 4 981204 P4 ARS1 STD+LONG 5-Dec-98 14:27 3 981205 P3 ARS1 STD ===================================================== And, the following tables were canceled due to no CDS or TRACE program suitable for Yohkoh to follow at the times. ===================================================== UT Time Pass Table ID ===================================================== 3-Dec-98 12:12 1 981203 P1 ARS2 CDS AR 3-Dec-98 17:19 4 981203 P4 ARS1 STD 4-Dec-98 14:10 2 981204 P2 ARS2 CDS AR ===================================================== 2.2 STT timer setting The STT timer was set during pass 4 (981201-1237) on 1-Dec-98 (Tuesday UT). The next timer setting should be on 8-Dec-98 (Tuesday UT). ---------------------------------------------------------------------------- 3. Errors and Problems 3.1 BCS Errors A BCS error occurred on pass 5 (981202-1238) on 2-Dec-98 (UT) and recovered on the same pass. 3.2 SXT Errors A bitmap error occurred on pass 1 (981203-0825) on 3-Dec-98 (UT) and recovered on the same pass (Yobi-C). 3.3 BDR Anomaly None. ---------------------------------------------------------------------------- 4. Special Operations 4.1 HXT Fine Gain Adjustment and HXT Calibrations HXT Fine Gain Adjustment operation was done successfully during pass 3 (981130- 1237) on 30-Nov-98 (UT) after the new OG modified for the operation was uploaded in the same pass. HXT CALs to check the new fine gain were carried out three times during pass 1 (981201-1134) on 1-Dec-98 (UT), pass 2 (981202-0928) and pass 3 (981202-1031) on 2-Dec-98 (UT). 4.2 Normal Pointing Adjustment Hugh Hudson implemented a repointing of the spacecraft during pass 2 (981204-0929) on 4-Dec-98 (UT). According to FFIs of playback data, the operation was done successfully (KSC tohbans). NOTE: OG table has changed into new parameters for the operation. ---------------------------------------------------------------------------- 5. DSN Communications 5.1 DSN Schedule Passes were added/deleted as follows. =================================================================== DSN Schedule Week Schedule Changes =================================================================== Final 50 0 passes deleted Preliminary 51 0 passes deleted Strawman 52 68 passes deleted by SSOC and 7 passes deleted for ASCA =================================================================== NOTE: None of the passes, which were requested to be added in week 49 and 50 with "ADD_DSN.PRO" code by week48 tohbans, could not be added because of other supports going on at the times. 5.2 Data Transmission from DSN -(Refer to /home/flare1/yohkoh/dsn_corrupt/98_49)-------------- 324 76 1419 corrupted tape Requested 25 Nov Closed/ same data 329 76 1216 not received Requested 02 Dec Closed/ correct data 330 66 0054 corrupted tape Requested 02 Dec 331 66 0433 corrupted tape Requested 02 Dec 332 76 0758 corrupted tape Requested 02 Dec Closed/ correct data 334 16 1003 corrupted tape Requested 02 Dec 334 16 1146 corrupted tape Requested 02 Dec 334 16 1329 corrupted tape Requested 02 Dec ---------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In week 49, we lost 6 passes to HALCA. In week 50, we will lose 10 passes to HALCA. ---------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for week 50 (7-Dec-98 -- 13-Dec-98) SSOC : K. Shibasaki, S. Watari KSC : H. Sekiguchi, Y. Nakagawa ---------------------------------------------------------------- 7.2 STT timer setting The next timer setting should be done on Tuesday, 08-Dec-98 (UT). ---------------------------------------------------------------- 7.3 Holiday Schedule The holiday in week 50 will be on Sunday, 13-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 Th 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. ---------------------------------------------------------------------------- 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 ===