SSOC Tohban Report for Week 48 (22-Nov-99 -- 28-Nov-99) SSOC: H. Hara KSC: R. Haga, S. Masuda(11/25-) 0. Meeting Attendance Ogawara, Kosugi, Watanabe, Hudson, Khan, Sakao, Aoki, Hara ------------------------------------------------------------------------------- 1. Solar Activity Solar activity becomes high. Nine M-class flare and one X-class flare occurred. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded during week 48: ================================================================ JST Day UT Start Time Pass Table ID ================================================================ Monday 22-NOV-99 13:13 3 991122 P3 ARS1 DARK Tuesday 23-NOV-99 10:02 1 991123 P1 ARS1 DIFF Tuesday 23-NOV-99 15:09 4 991123 P4 ARS1 HI-FFI Wednesday 24-NOV-99 13:39 3 991124 P3 ARS1 HI-FFI Thursday 25-NOV-99 10:26 1 991125 P1 ARS1 HI-FFI Friday 26-NOV-99 14:10 "4" 991126 P1 ARS1 STD ================================================================ SXT table was uploaded at 4th pass because Yohkoh entered KSC pass in the flare mode. 2.2 STT Timer setting STT timer was done during Pass 3, 991123-0927, on 23-Nov-99 (UT). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Acquisition of ACS data in FAQ mode In the satellite-night time ACS data in FAQ mode were successfully obtained for Solar-B work. The data were obtained in the following passes. 991125-0721 (10:25-10:40 UT) 991125-1135 (17:18-17:28 UT) 991126-1032 (15:47-16:00 UT) ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: None 4.2 SXT Errors: None ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact pass cancellations/additions The following DSN/NASA passes were added/deleted: =========================================================================== DSN/NASA Schedule Week Schedule Changes =========================================================================== Final 48 3 Cancellations by SSOC Final 49 7 Cancellations by SSOC Preliminary 50 2 Cancellations by SSOC Strawman 51 45 Cancellations by SSOC =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copy of /home/flare1/yohkoh/dsn_corrupt/99_48)---- 315 74 1645 corrupted tape requested 16-Nov no response tape requested 22-Nov Closed/ Same data Low with dump on. Low Elevation pass. 319 16 1209 missing data requested 18-Nov Closed/ Same data 322 74 1957 not received requested 24-Nov 323 74 1322 missing data tape requested 24-Nov ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 48, 11 KSC contacts was lost, 10 for ASCA, 1 for AKEBONO In Week 49, 10 KSC contacts will be lost, 9 for ASCA, 1 for AKEBONO ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Week 49 SSOC: H. Hudson, K. Aoki KSC: S. Masuda, Sekiguchi 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday 30-Nov-99. 7.3 Operation on 4-6 Dec Yohkoh operation at KSC passes will be affected due to a test for launch operation of Astro-E. 7.4 Holiday Schedule Next Yohkoh holiday will be Sunday, 6-Dec-99 (JST), but it is tentative. ------------------------------------------------------------------------------- 8. Unchanged Hikitsugi Items from Last Week 8.1 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.2 Keeping Santiago contacts Currently, ASCA conflicts cause the loss of about 10 KSC contacts per week. We do not know which contacts Yohkoh will lose until the weekly meeting. Santiago contacts occur on the same orbits as KSC contacts. Therefore, please keep as many Santiago contacts as possible in the DSN Strawman and Preliminary Forecasts. 8.3 OP and Real-time Command Glossary We need a shorthand glossary for common OP and command-sheet commands. This already exists pretty much in the Sakao-san manual in Japanese, and the Week 26 tohbans started accumulating an English version on "yohkoh.glossary" 8.4 Software Problems pr_gev with /hc keyword produces a temporary output file but does not print it at the printer. 8.5 OP_FIRST_GUESS problem (w38) 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. 8.6 Keeping Wallops contacts (w42) 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. 8.7 OP_FIRST_GUESS problem (w42) In one instance, op_first_guess produced a nested RB HV RDCT ON/ RB HV RDCT OFF sequence (i.e. ON-ON-OFF-OFF). This problem is easily spotted, and corrected by deleting the second ON command and the first OFF command manually. The bug has been reported to J. Lemen. 8.8 Tohban Manual (w42) The English-language version of the Tohban Manual has been updated recently and should be considered authoritative. The corresponding checksheet is also new (August 1999). 8.9 A New Antenna System in Wallops (w43) Since October 1, a new antenna GN-WGS is used instead of a 9m antenna DSS-76 in Wallops station. SSOC tohbans should not be surprised at the unfamiliar antenna code GN-WGS in the DSN schedules. This new code GN-WGS is replaced with DSS-80 in solass.w## and solsf.w## by the program "fmt_wallops". But some programs for the strawman scheduling replace it with DSS-0. 8.10 OP_FIRST_GUESS Problem (w46) OP_FIRST_GUESS printed "Night" instead of "Day" (as it should have printed) on pass sheets for 1999/11/15 Pass 5(991115-1341). 8.11 OP_FIRST_GUESS Problem (w46) During the preparation of the 991115-1031 OP, OP_FIRST_GUESS inserted a QUIET RATE HIGH command during an SAA passage at a time when about 20 minutes of daylight remained. The maximum duration of QUIET RATE HIGH mode during an SAA in daylight should be 10 minutes. 8.12 OP_FIRST_GUESS Problem (w46) 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. All these 3 problems above (item 8.10, 8.11 and 8.12) were occured also on week 45. === END ===