SSOC Tohban Report for Week 51 (13-Dec-99 to 19-Dec-99) SSOC: Tsuneta, Hata KSC: Kumagai, Kobayashi 0. Meeting Attendance Watanabe, Ogawara, Sakao, Nitta, Sawa, Hara, Hata ------------------------------------------------------------------------------- 1. Solar Activity Solar Activity keeps almost constant around C-level. There were two M-class (M1.0) flares. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ================================================================ JST Day UT Start Time Pass Table ID ================================================================ Monday AM 13-DEC-99 00:35 1 991213 P1 DIFF Monday AM 13-DEC-99 03:58 3 991213 P3 DARKCAL Tuesday AM 14-DEC-99 04:11 5 991214 P3 STD Wednesday AM 15-DEC-99 04:23 3 991215 P3 STD Thursday AM 16-DEC-99 04:36 4 991216 P4 STD Saturday AM 18-DEC-99 01:36 3 991218 P3 ARS1 STD ================================================================ 2.2 STT Timer setting STT timer was re-set during Pass 3, 991214-0309, on 14-Dec-99 (UT). ------------------------------------------------------------------------------- 3. Special Operations None ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: None 4.2 SXT Errors: SXT error was found in the pass 3 of 17-Dec. It was recovered in the pass 5 of the same day. 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 52 2 Cancellations by SSOC Preliminary 53 3 Cancellations by SSOC Strawman 02 78 Cancellations by SSOC =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copy of /home/flare1/yohkoh/dsn_corrupt/99_51)---- 333 74 1528 corrupted tape requested 02-Dec Closed/ correct data 338 82 2146 corrupted tape requested 10-Dec Closed/ correct data 346 16 2316 not received requested 15-Dec Closed/ No Data DR#G05578 was opened for this support. The data was not enabled to the CDR. 344 82 2119 - 2131: No Data Fuction Generator that was providing the clock to the recorders was changed during the dump making the data unrecoverable off of tape. 346 82 2157 - 2206: 15441 Blocks Pass was only 7 degree max El and had masking at AOS. Mod was on at AOS. 5.3 Software upgrades The operation programs PRINT_OGSEL and DSN_CONFLICT did not work, but now these work well. These efforts have been done by Hudson-san, Lemen-san and Slater-san. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 51, 10 KSC contacts were lost, all for ASCA. In Week 52, 8 KSC contacts will be lost, all for ASCA. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for next Week SSOC: R.Kano, (Te.Watanabe only today) KSC: T. Kobayashi, K.Ichimoto 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday 21-Dec-99 (UT). 7.3 Holiday Schedule Next Yohkoh holiday will be Sunday, 26-Dec-99 (JST). 7.4 KSC conflict meeting The next KSC conflict meeting will be held at 10:00 on Dec 24 Fri on schedule. New year operation will be discussed there. 7.5 Today's Santiago contact cancel According to following section 8.1, We cancelled today's Santiago pass last Saturday. ------------------------------------------------------------------------------- 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 ===