SSOC Tohban Report for Week 23 (29-May-2000 to 5-Jun-2000) SSOC: Sawa, D.Suzuki KSC: H.Tonooka , Y.Katsukawa 0. Meeting Attendees Sawa, Suzuki, Kosugi, Nitta, Sakao, Khan, Hara, Hudson ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was fairly low at last month. But there were several GOES M-class and C-class flares on June. The GOES soft X-ray background level was lower than previous weeks, remaining under C-level all week. There were several active regions in the hemispheres . New active region appears at the East limb. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Tuesday AM 29-MAY-00 21:38 4 000529 P4 ARS1 DARK* Wednesday AM 30-MAY-00 14:59 1 000530 P1 ARS1 DIF* Wednesday AM 30-MAY-00 21:47 5 000530 P4 ARS1 STD* Thursday AM 31-MAY-00 15:05 1 000531 P4 ARS1 FRFFI* Thursday AM 31-MAY-00 20:13 4 000531 P4 ARS1 QRFFI* Friday AM 1-JUN-00 20:22 4 000601 P4 ARS1 STD* Sunday AM 3-JUN-00 17:14 3 000602 P4 ARS1 STD* ====================================================================== 2.2 STT Timer setting The STT timer was reset during Pass 3 on Tue 30-May (UT) (ID: 000530-1237). ------------------------------------------------------------------------------- 3. Special Operations During Pass 4 on Tue 30-May (UT),"ACP with NSAS operation test" was tested leading to the possibility of observations of the Crab Nebula. On Wed 31-May HXT background check was done for Crab Nebula operation by OP. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None. 4.2 BCS Errors Tuesday(JST),BCS error occurred at the 3 pass,and this error was cleared by BCS recovary at the 4 pass. Friday(JST),BCS error occurred at the 4 pass,and this error was cleared by BCS recovary at the 5 pass. Saturday(JST),BCS error occurred at the 3 pass,and this error was cleared by BCS recovary at the 4 pass. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred (requested): =========================================================================== DSN/NASA Schedule Week Schedule Changes =========================================================================== Final 23 (0) additions; 0 cancelation by DSN Final 24 (0) additions; 7 cancelations (SSOC: 7; DSN: 0) Forecast 25 (0) additions; (6) cancelation by SSOC Strawman 26 (62) cancelations (Seko: 5, SSOC: 57) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_23)---- 141 82 1548 corrupted tape requested 23-May no response tape requested 26-May Closed/ correct data 147 82 0811 corrupted tape requested 23-May Closed/ correct data 152 66 0403 - 0416 No TLM data ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule During week 24 Yohkoh will lose 6 KSC passes to ASCA and 2 to HALCA. During week 24 34m ANT downlink will be 9 Passes. During week 23 Yohkoh lost 5 KSC passes to ASCA and 4 to HALCA. During week 23 34m ANT downlink was 8 Passes. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: Hara, Sugiho KSC: Katsukawa, Matsumoto_Y 7.2 STT Timer Setting The next STT TIMER SET is due on 06-Jun-2000 (Tuesday). 7.3 OP OP and command sheets for Tuesday AM (JST) 05-Jun-00 was prepared , but have not been sent to KSC. 7.4 Holiday Schedule The next satellite holiday will be 011-JUN Sunday UT (= 012-JUN Monday JST). ------------------------------------------------------------------------------ 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. SSOC Tohban for w09 asked Hudson-san to prepare an azimuth-elevation map in Santiago station. 8.2 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.3 Software Problems PR_GEV with /hc keyword produces a temporary output file but does not print it at the printer. 8.4 OP_FIRST_GUESS Problem (1999-w38, 1999-w45) 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. 8.5 Keeping Wallops Contacts (1999-w42, 1999-w45) 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. 8.6 OP_FIRST_GUESS Problem (1999-w46, 1999-w45) 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. 8.7 Santiago Passes Since week 20 we have no longer been receiving Santiago down-link passes. So currently no Santiago passes should be included in the OPs. However this situation may change in the future as letters are being written requesting their re-instatement. 8.8 DSN Pass Additions *** Don't forget to request pass additions! *** Yohkoh loses DSN passes as follows: 1) Canceled due to conflicts with ASCA (by Seko-san) 2) Canceled by the SSOC Tohbans 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 cancelations by Seko will generally be marked in red ink, and those by SSOC by pencil: Only request additions from the penciled cancelations). The routine to use is ADD_DSN: e.g., IDL> ADD_DSN, 28, /prelim and IDL> ADD_DSN, 29, /final Decide on the complete list of passes to be added and select them like CANCEL_DSN. Then ftp and email the appropriate file. ------------------------------------------------------------------------------ === END ===