SSOC Tohban's Report for Week 30 (19-July-99 -- 25-July-99) SSOC: J. Sato, H.Ishizaki KSC: T.Magara, S.Kato 0. Meeting Attendance B.Handy, J.Khan, Y.Ogawara, M.Sawa, T.Watanabe -------------------------------------------------------------- 1. Solar Activity The solar activity was high. An M 5.8 class and many C class flares occurred on NOAA 8636 which is a large active region. GOES level at the weekend was extremely high (C5?). -------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded during week 29. ===================================================== JST Date Pass Table ID ===================================================== Tue 20-JUL-99 2 990719 P2 ARS1 DARK Wed 21-JUL-99 3 990721 P3 ARS1 DIFFUSER Thu 22-JUL-99 1 990722 P1 ARS0 SPECIAL Fri 23-JUL-99 4 990723 P4 ARS1 STANDARD Sat 24-JUL-99 3 990724 P3 ARS1 STANDARD Mon 26-JUL-99 2 990725 P2 ARS1 STANDARD ===================================================== 2.2 STT Timer setting STT timer set were done on 19-July-99 Pass 1 and 22-July-99 Pass 3. Next settting will be done Tuesday, 27-July-99. -------------------------------------------------------------- 3. Special Operations No special operations. -------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: None 4.2 SXT Errors: None 4.3 Mis-communication between SXT chief observaor and SSOC Tohbans Although SSOC tohban heared from SXT chief observer that CCD bake out is planned on Thursday-Friday at the Monday meeting, we did not receive any fax during tohban's work on Thurday. Therefore, we did not include such a table plan in command sheets though SXT table plan was sent on the late of the eveninng (we knew it on the next day). So, we (SSOC tohabn) should have checked whether such a table is planned. Also, we think SXT chief observer should tell us the schedule on the Thursday if it is difficult to prepare the table before tohbans go out. 4.4 A question of the relation between CCD bake out and flare mode. On Friday, KSC contacts during 1,2,3 and 5 passes have been started with flare mode. Heater off and Tex on commands during 2 and 3 passes were executed by KSC Tohbans, and sxt table upload was planned during the next pass. After the 3rd pass, KSC tohbans asked SSOC tohbans whether next SXT table will be uploaded with irrespective of flare mode. SXT chief observer's reply was to do upload the table. Is this a general rule? If so, please include this exception in Yohkoh manuals. (Yohkoh was not a flare mode during 4th pass.) -------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact pass cancels/adds The following DSN/NASA passes were added/deleted: =================================================================== DSN/NASA Schedule Week Schedule Changes =================================================================== Real-time 30 none Final 31 0 cancel by SSOC 2 cancel by Wallops (due to Chandra launch) Preliminary 32 11 add Preliminary 32 1 cancel by SSOC Strawman 33 73 cancel =================================================================== 5.2 Data Transmission from NASA Ground Stations -(From /home/flare1/yohkoh/dsn_corrupt/99_30)--------------- 191 80 2312 not received requested 15-Jul no response requested 21-Jul Closed/ correct data 192 80 1820 not received requested 15-Jul Closed/ correct data 193 46 1247 not received requested 16-Jul Closed/ bonus data. 193 46 1428 not received requested 16-Jul Closed/ NO DATA -------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 30, 9 KSC contacts lost. In Week 31, 9 KSC contacts lost. 8 for ASCA, 1 for HALCA. Note: For future weeks, it would be nice if Yohkoh could get passes 4 and 5 prior to each weekend operation, and passes 1 and 2 immediately following. This would aid in DSN scheduling. -------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for week 31 SSOC: T.Sakao/T.Watanabe, N.Shinohara KSC: S.Kato, S.Kubo@ssoc 7.2 STT timer setting The next STT TIMER SET is due on pass ? on 27-Jul-99. 7.3 Holiday Schedule The holiday will be 01-Aug.-1999, Sunday (JST). 7.4 If possible, please schedule terminator opportunities on any weekend table (ie, if room permits). 7.5 KSC pass conflicts (from earlier weeks) ASCA conflicts cause the loss of about 10 KSC contacts per week at this time. We do not know which contacts Yohkoh will lose until the weekly meeting. Santiago contacts occur on the same orbits as KSC contacts. Therefore, keep as many Santiago contacts as possible in the DSN Strawman and Preliminary Forecasts. 7.7 Command glossary We need a shorthand glossary for common OP and command-sheet commands. This already exists pretty much in the Sakao manual in Japanese, and the Week 26 tohbans started accumulating an English version on "yohkoh.glossary" 7.8 Yohkoh's Total Solar Eclipse of 11-Aug-1999 According to Dr. Mitsuru Soma (NAOJ)'s calculation, Yohkoh will be able to see partial eclipses twice this time. The maximum depth of the eclipse was predicted about 55% (sun-moon center distance = 695 arcsec) at 13h6m37s UT. His prediction will be revised, when the latest Yohkoh orbital elements become available prior to the eclipse. === END ===