SSOC Tohban Report for Week 50 (6-Dec-99 to 12-Dec-99) SSOC: Shinoda, Yokoyama KSC: Sekiguchi, Kumagai 0. Meeting Attendance Hata, Hudson, Kosugi, Ogawara, Sakao, Sawa, Shimojo, Yokoyama ------------------------------------------------------------------------------- 1. Solar Activity Solar Activity was quiet. It keeps almost constant around C-level. There was only one M-class (M1.0) flare. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ================================================================ JST Day UT Start Time Pass Table ID ================================================================ Tuesday PM 7-DEC-99 07:50 3 991207 P3 ARS1 DARKCAL Wednesday PM 8-DEC-99 04:38 1 991208 P1 ARS1 DIFF Wednesday PM 8-DEC-99 08:03 3 991208 P3 ARS1 HI-FFI Thursday PM 9-DEC-99 06:33 3 991209 P3 ARS1 HI-FFI Friday PM 10-DEC-99 03:21 1 991210 P1 ARS0 BAKE Saturday PM 11-DEC-99 05:15 3 991211 P3 ARS1 STD ================================================================ 2.2 STT Timer setting STT timer was re-set during Pass 5, 991207-0723, on 7-Dec-99 (UT). ------------------------------------------------------------------------------- 3. Special Operations 3.1 SXT CCD bakeout An SXT bakeout was done between pass 3 of Dec 10 (991210-0414) and pass 1 of Dec 11 (991211-0204). ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: None 4.2 SXT Errors: None 4.3 KSC printer out of order ------------------------------------------------------------------------------- 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 51 4 Cancellations by SSOC Preliminary 52 1 Cancellations by SSOC Strawman 53/01 104 Cancellations by SSOC Many because of the new-year operations. =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copy of /home/flare1/yohkoh/dsn_corrupt/99_50)---- 333 46 1822 missing data requested 02-Dec no response requested 06-Dec no response requested 09-Dec Closed/ correct data 333 74 1528 corrupted tape requested 02-Dec Closed/ correct data 338 82 2146 corrupted tape requested 10-Dec 338 74 0246 - No data: 9 meter antenna drove into limits at AOS. No data was captured on this pass. 5.4 Software upgrades The operation program DSN_CONFLICT did not work correctly due to a Y2K bug but run OK now. These efforts have been done by Hudson-san, Lemen-san and Slater-san. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 50, 12 KSC contacts were lost, 9 for ASCA, 3 for Astro-E. In Week 51, 10 KSC contacts will be lost, all for ASCA. The holiday was placed on Monday, Dec. 6, replaced by normal operations on Dec. 5. The next was Dec. 12. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for next Week SSOC: M. Hata, S. Tsuneta KSC: K. Kumagai, T. Kobayashi 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday 14-Dec-99. 7.3 Holiday Schedule Next Yohkoh holiday will be Sunday, 19-Dec-99 (JST). 7.4 KSC conflict meeting The next KSC conflict meeting will be held at 13:30 on Dec 16 Thu on schedule. But the next after the next will be at 10:10 on Dec 24 Fri. New year operation will be discussed there. 7.5 DSN Wallops schedule for w53/01 By our mistake (sorry), 19 Wallops passes were cancelled for the strawman schedule W53/01. This is violating our standing principle (see item 8.6). Next tohban should re-add these passes. 7.6 flare machines maintenance We have a major maintenance for flare## (except for flare1 and flare20) machines. This is for the Y2K issue. ------------------------------------------------------------------------------- 8. Unchanged Hikitsugi Items from Last Week 8.1 Elevation angle limit at Santiago (w49) Seko_san noticed two fault reports from Santiago (DSS-74) due to low elevation at the end of the pass: These were shown as max elevations of 11.1 degrees (323/1322) and 10.7 degrees (315/1645) in our database. Accordingly, after consultation with Watanabe-san, we suggest increasing the threshold (for this station only) to 13.5 degrees maximum elevation. 8.2 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.3 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. 8.4 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" 8.5 Software Problems pr_gev with /hc keyword produces a temporary output file but does not print it at the printer. 8.6 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. 8.7 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. 8.8 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. 8.9 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). 8.10 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. 8.11 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). 8.12 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. 8.13 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) occurred also on week 45. === END ===