-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This report is for week 53 in 1999. Previous report for Week 53 in 1999 was updated. The informations on the preliminary schedule for week 3 and on the strawman schedule for week 4 were updated. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- SSOC Tohban Report for Week 53 (27-Dec-99 to 31-Dec-99) SSOC: Te. Watanabe (, S. Kubo on Fri and on Sat) KSC: T. Kobayashi, K. Ichimoto 0. Meeting Attendees No meeting held ------------------------------------------------------------------------------- 1. Solar Activity Solar activity decreased to sub-C levels, though three M-class flares were recorded. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ================================================================ JST Day UT Start Time Pass Table ID ================================================================ Monday AM 26-DEC-99 18:55 1 991226 P1 ARS1 DIFF Monday AM 27-DEC-99 00:03 4 991226 P4 ARS1 DARK Tuesday AM 27-DEC-99 17:26 1 991227 P1 ARS1 FG Wednesday AM 28-DEC-99 21:02 3 991228 P3 ARS1 FG Thursday AM 29-DEC-99 19:31 3 991229 P3 ARS1 STD ================================================================ 2.2 STT Timer setting STT timer was re-set during Pass 1, 991227-1135, on 27-Dec-99 (UT). ------------------------------------------------------------------------------- 3. Special Operations 3. 1. The millennium-end long OP was uploaded at 991229-1343. ------------------------------------------------------------------------------- 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 53/01 15 Cancellations by SSOC Final 02 6 Cancellations by SSOC Preliminary 03 0 Cancellations by SSOC 2 Additions by SSOC Strawman 04 65 Cancellations by SSOC =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(to be copied from /home/flare1/yohkoh/dsn_corrupt/1999/99_53)---- ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 53/01, 8 KSC contacts will be lost, 5 for ASCA and 3 for HALCA. In Week 02, 10 KSC contacts will be lost, 6 for ASCA and 4 for HALCA. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for next Week SSOC: H. Hara, M. Nishio KSC: T. Watanabe, M. Shimojo 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday 04-Jan-00 (UT). ------------------------------------------------------------------------------- 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 (1999-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 (1999-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 (1999-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 (1999-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 (1999-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 (1999-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 (1999-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 (1999-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 in 1999. === END ===