SSOC Tohban Report for Week 42 (11-Oct-99 -- 17-Oct-99) SSOC: K. Kobayashi, T. Sakao KSC: D. Suzuki, Y. Katsukawa 0. Meeting Attendance Ogawara, Watanabe, Kobayashi, Shinohara, Kano, Fletcher, Kahn, McKenzie ------------------------------------------------------------------------------- 1. Solar Activity While solar activity was low in the first half of the week, with the GOES background level staying at or below C1 and only two flares above C3. The activity rose slightly over the week, and an X1.8 flare occured at 14-OCT-99 08:54. No other M or X class flares were observed. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded during week 42: ====================================================== UT Date & Time (UT) Pass Table ID ====================================================== 11-Oct-99 07:10 1 991011 P1 ARS1 STD 12-Oct-99 09:05 3 991012 P3 ARS0 DK+J017 13-Oct-99 06:00 1 991013 P1 ARS0 DIFF+J017 11:05 4 991013 P4 ARS1 STD 14-Oct-99 09:30 3 991014 P3 ARS1 STD 15-Oct-99 08:00 3 991015 P3 ARS1 STD 16-Oct-99 05:00 1 991016 P1 ARS1 STD ====================================================== 2.2 STT Timer setting STT timer was set during Pass 5 of 12-Oct-99 (UT). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Normal Pointing Update Normal pointing direction of the spacecraft was changed in Pass 2 (7:50 UT) of October 14 (991014-0516) by ROG-20H. The new pointing direction is "S/C W.785 N1.39 (offset angles in arcmin)". (The old one is W.864 N1.18.) ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: None A BCS error was found in Pass 1 of 12-Oct (991012-0412) and recovered in Pass 3 of 12-Oct (991012-0619). 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 =========================================================================== Real-time 42 3 Cancellations by SSOC Real-time 43 1 Cancellation by SSOC Preliminary 44 4 Additions requested by SSOC Strawman 45 46 Cancellations by SSOC =========================================================================== 5.2 Data Transmission from NASA Ground Stations -(From /home/flare1/yohkoh/dsn_corrupt/99_42)--------------- 276 80 0551 corrupted tape requested 08-Oct Closed/ same data 277 16 0923 lacking data requested 08-Oct Closed/ same data 278 74 1829 corrupted tape requested 08-Oct Closed/ same data 280 16 0639 lacking data requested 13-Oct 281 46 1838 lacking data requested 13-Oct ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 42, 13 KSC contacts were lost, all to ASCA. In Week 43, 13 KSC contacts will be lost, 12 to ASCA and 1 to HALCA. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Week 43 SSOC: N. Shinohara, R. Kano KSC: Y. Katsukawa, M. Shimojo 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday, 19-Oct-99 (UT). 7.3 Holiday Schedule Next Yohkoh holiday will be Sunday, 24-Oct-99 (JST). 7.4 Tohban Manual 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). ------------- The Following is Unchanged 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. --- following items are new this week --- 8.6 Keeping Wallops contacts 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. === END ===