SSOC Tohban Report for Week 08 (14-Sep-2000 to 20-Feb-2000) SSOC: Y. Kato, T. Sakao (ex.18), M. Shimojo (Feb.18) KSC: T. Yokoyama, T. Magara 0. Meeting Attendees H. Hudson, J. Khan, D. McKenzie, T. Sakao, M. Sawa, K. Shinoda, T. Watanabe ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was low last week with the background GOES level stayed below C1. Two M-class flares commenced on Feb. 17, the first one in NOAA AR 8869 and the second in AR 8872. For both of the two flares, the impulsive phase took place during SAA passage followed by S/C night. There were two additional M-class flares; one on Feb. 19, the other on Feb. 20. The latter one commenced during the S/C daytime, out of SAA, so it may have been well observed with Yohkoh. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Tuesday 14-FEB-00 20:30 2 000214 P2 ARS1 DIFF 23:55 4 000214 P4 ARS1 DARKCAL Wednesday 16-FEB-00 0:06 4 000215 P4 ARS1 STD Thursday 16-FEB-00 22:36 4 000216 P4 ARS1 STD Friday 17-FEB-00 22:46 4 000217 P4 ARS1 STD Saturday 18-FEB-00 21:15 3 000218 P3 ARS1 STD Sunday 19-FEB-00 16:20 1 000219 P1 ARS1 STD ====================================================================== 2.2 STT Timer setting STT timer was re-set and started during Pass 1, 000215-1238, on 15-Feb-2000 (UT). ------------------------------------------------------------------------------- 3. Special Operations HXT CAL was carried out three times in W08: 17-Feb-00 Pass 1 17:38 UT (000217-1136) 18-Feb-00 Pass 1 17:50 UT (000218-1136) 19-Feb-00 Pass 1 16:28 UT (000219-1133) ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: None 4.2 SXT Errors: None 4.3 DP Errors: None 4.4 HXA OFF During Pass 1 of 17-Feb UT (000217-1136), KSC personnels mistakenly issued 'HXA CAL ON' instead of 'HXT CAL ON' for HXT CAL. They noticed this mistake but instead of issuing 'HXA CAL OFF' what they issued was 'HXA OFF' with which HXA electronics was powered off. The following shows the seqence of commands issued during that pass: SXT CTL MANU MANU FL H HXT A ON HXA CAL ON HXA OFF ( <- reported as 'HXA CAL OFF' ) HXT CAL ON ..... HXT CAL OFF HXT A OFF ACS MOD H SXT CTL AT The HXA was left OFF during the whole Friday since a FAX message from KSC notifying the operation mistake (as well as KSC operations report) said that HXA CAL OFF was issued following the erroneous HXA CAL ON, which was not actually the case. The HXA electronics was powered on again by 'HXA ON' command in Pass 1 of 20-Feb UT (000219-1133). No HXA data between the above two passes is available. ------------------------------------------------------------------------------- 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 08 0 Additions Requested: 0 Given: 1 Cancelation Final 09 0 Additions Requested: 0 Given; 12 Cancelations Preliminary 10 9 Additions Requested: 2 Given; 2 Cancelations Strawman 11 71 Cancelations: 20 by Seko-san, 51 by SSOC =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(to be copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_08)---- 043 76 0850 corrupted tape requested 15-Feb no response tape requested 18-Feb 043 76 1030 corrupted tape requested 15-Feb no response tape requested 18-Feb 043 82 1537 corrupted tape requested 15-Feb no response tape requested 18-Feb DOY-040 S74 2204 - 2213 : 17211 Blocks Low elevation pass, only 11 deg. Several drops at LOS. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 08, we lost 10 KSC contacts: Halca: 3, ASCA: 7 In Week 09, we will lose 12 KSC contacts: Halca: 5, ASCA: 4, Geotail backup: 2 ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for next Week SSOC: K. Shinoda (ex. 26,28), H. Nakajima KSC: T. Magara (-26), M. Kozu 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday '22-Feb-2000 (UT)'. 7.3 OP OP for 21 Feb has already been prepared and transferred by W08 SSOC tobans. 7.4 Holiday Schedule Next Yohkoh holiday will be Sunday, 27-Feb-00 (JST). 7.5 DSN Pass Additions Yohkoh loses DSN passes as follows: 1) Canceled due to conflicts with ASCA 2) Canceled because Santiago is unavailable 3) Canceled by the SSOC tohbans 4) Deleted by DSN The tohbans should compare the STRAWMAN, PRELIMINARY and FINAL schedules for each week to see if some of the passes lost by case (4) could be replaced by ones from case (3). This means it may be possible to request pass additions for the PRELIMINARY and FINAL week schedules from the (case (3)) STRAWMAN cancellations. The routine to use is ADD_DSN: e.g., IDL> add_dsn, 49 Decide on the complete list of passes to be added and select them like cancel_dsn. Then ftp and email the appropriate file. ------------------------------------------------------------------------------- 8. Unchanged Hikitsugi Items from Previous Weeks: 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 ===