SSOC Tohban Report for Week 38 (11-Sep-2000 to 17-Sep-2000) SSOC: H. Nakajima, H. Hudson KSC: T. Tamura, M. Hagino 0. Meeting Attendees Takeda, Nitta, Hudson, Nagata, Suematsu, Watanabe, Kano, Ogawara, Matsuzaki ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was low but with a surge around the growth of AR 9165, for which there was an early warning from McIntosh. A total of 6 M-class flares through Sunday. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads 00_w38 The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Tuesday AM 11-SEP-00 17:03 4 000911 P4 ARS1 DIF126* Tuesday PM 12-SEP-00 13:46 1 000912 P1 ARS1 DARK Wednesday AM 12-SEP-00 18:52 4 000912 P4 ARS1 JOP126* Wednesday PM 13-SEP-00 13:52 2 000913 P2 ARS1 JOP126 Thursday PM 14-SEP-00 13:59 2 000914 P2 ARS1 JOP104 Friday PM 15-SEP-00 12:24 2 000915 P2 ARS1 JOP104 Saturday PM 16-SEP-00 14:13 3 000916 P3 ARS1 JOP104 ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 2 on Tuesday, 12-Sep-00 JST. (PASS ID: 000912-1031). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Normal Pointing Normal Pointing was updated during pass 1 on 11-Sep-00 (Pass ID: 000911-0928). 3.2 HXT Calibration HXT fine gain adjustment, 000911-1031 HXT calibration, 000912-1135 HXT calibration, 000913-1032 HXT calibration, 000913-1135 ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None 4.2 DP Errors None 4.3 BCS Errors None 4.4 Real-time Command Error SSOC tohbans omitted an antenna change from the real-time command sheets for Pass 1, 13-Sep. This resulted in 17% data loss. Sorry! 4.5 Power outage The thunderstorms on Sep. 16 brought some of the workstation system down, and there was possibly some damage to an isassN disk. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 38 2 cancels by SSOC, no adds requested Final 39 1 cancels by SSOC, no adds requested Forecast 40 1 cancels by SSOC, 4 adds requested Strawman 41 53 cancels by SSOC =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_38)---- 251 66 0534 - 0544 : No Data TLM DATA not acquired. T5C1 fails at BOT. Select T5C2 but if fails also. TGC#2 was brought up but it was too late. 252 66 0359 - 0409 ; No Data OPS chief advices that no data was received at JPL. Late entry made by Crew-A. Looking post pass into the LMC log, it look like that none of the two TLM channels were in solid of lock at any time. 253 66 0359 not received requested 13-Sep 253 76 0855 not received requested 13-Sep ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 1 pass (to Akebono). - Yohkoh will lose 2 passes (HALCA) ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: H. Kozu, Y. Suematsu KSC: Y. Hanaoka, H. Tonooka 7.2 STT Timer Setting The next STT TIMER SET is due on 19-Sep-2000 (Tuesday) JST. 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The next 34m antena operation will be 24-Sep, Monday JST. 7.4 The OP for Monday night has been created and printed, but not checked. Nor did we do the command sheets, sorry! ------------------------------------------------------------------------------ 8. Unchanged Hikitsugi Items from Previous Weeks: 8.1 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.2 Software Problems PR_GEV with /hc keyword produces a temporary output file but does not print it at the printer. 8.3 OP_FIRST_GUESS Problem (1)(1999-w38, 1999-w45) In a situation with two KSC cancellations on each of two days (a rare condition) the BDR optimization feature of OP_FIRST_GUESS crashed. After experimentation, we found that it ran OK without the final cancellation request (two the first day, but just the first one on the second day). The second one then had to be removed manually. Records of the problem were forwarded to Lemen-san, but no answer had arrived at the time of writing. (2)(1999-w46, 1999-w45) During the preparation of 991109-1238 OP,991110-1135 OP and 991111-1032 OP OP_FIRST_GUESS crashed with the message "OP_START_END: problem with detection of LOS/AOS/DSN Repro events". This problem was solved by changing OP_FIRST_GUESS options: choose optimization 1 rather than 2. 8.4 Keeping Wallops contacts (1999-w42, 1999-w45) This is not a new policy, but to emphasize (paraphrased from e-mail from Hugh Hudson): We should keep all valid Wallops passes, independent of day/night status, in order to maximize our Wallops use and minimize our DSN use. NASA won't give us many DSN passes anyway, so if we select a Goldstone pass in preference to a Wallops one, we'll normally just lose both. Another reason is that CANCEL_DSN software needs some repair, since it seems to replace the DSS identifier WGS with 0. This is likely to cause confusion, but of course if we don't cancel Wallops passes we won't have this problem often. 8.5 DSN Pass Additions (2000-w20) *** Don't forget to request pass additions! *** Yohkoh loses DSN passes as follows: (1) Canceled due to conflicts with ASCA (by Seko-san) (2) Canceled because Santiago is unavailable (3) Canceled by the SSOC tohbans (4) Deleted by DSN The Tohbans SHOULD COMPARE the STRAWMAN, PRELIMINARY and FINAL schedules -------------- for each week to see if some of the passes lost by case (4) could be replaced by ones from case (3). This means it may be possible to request pass additions for the PRELIMINARY and FINAL week schedules from the (case (3)) STRAWMAN cancellations. (The cancellations by Seko will generally be marked in red ink, and those by SSOC by pencil: Only request additions from the penciled cancelations). The routine to use is ADD_DSN: e.g., IDL> ADD_DSN, 28, /prelim and IDL> ADD_DSN, 29, /final Decide on the complete list of passes to be added and select them like CANCEL_DSN. Then ftp and email the appropriate file. 8.6 OP Sequence for KSC Operation Using 34 m Antenna (2000-w24) KSC downlink operation with 34 m antenna has started since the end of May 2000. Since we cannot send any command to Yohkoh with 34 m antenna, the downlink operation is conducted with OP commands. 8.7 34m ANT Operation (2000-w33) 34m Operation will be done only on Sunday (=Yohkoh holiday) for up to 2 or 3 passes. There will be no 34m OP to compensate for the lost pass due to the conflict with the other satellites. For further details, please ask Kosugi-san. Note that 34m operation requires more CE slots in OP table than DSN operation does. Weekend OP cannot accomodate many 34m passes without sacrificing even more DSN passes. Maybe, a couple of other items should be added to the operation manual ( see 4.4 of w32-2000 report). 8.8 Max Elevation Max elevation must be higher than the following value: Contact Max El.(degrees) Wallops 6.5 Others 7.0 8.9 OP and SXT Table Transfers Trouble(2000-w34) OP and SXT tables can not be transferred to KSC correctly when the MS computer at ISAS is in Initial Program Load(IPL). ASCA and HALCA groups operate the satellite from ISAS. We must not transfer OP and SXT tables in the following periods: "An hour before the beginning of HALCA/ASCA contact and an hour after the end of HALCA contact." As for IPL of MS computer at KSC, operators confirm if new OP and SXT tables come to MS computer at ISAS after the IPL. 8.10 Pass conflict issues In the operation meeting among ASCA, AKEBONO, HALCA, and YOHKOH, held on Thursday 31-Aug-00, ASCA group prpposed that (1)they used only one pass a day, time of which is located between 4 and 20 (JST), and that (2)they wouldn't use DSN contacts for ASCA operations. === END ===