SSOC Tohban Report for Week 21 (15-May-2000 to 21-May-2000) SSOC: Y. Hanaoka, J. I. Khan KSC: M. Hagino, S. Nagata 0. Meeting Attendees Akioka, Hanaoka, Khan, Kosugi, Nagata, Nitta, Ogawara, Sawa, Yamasaki ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was fairly high last week. There were nine GOES M-class flares and many C-class flares. The GOES soft X-ray background level was higher than previous weeks, remaining above C-level all week, except Sunday. There were several active regions in both the northern and southern hemispheres. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Monday AM 15-May-00 03:55 4 000514 P4 ARS1 DKCAL Tuesday AM 15-MAY-00 22:57 1 000515 P1 ARS1 DIFF Tuesday AM 16-MAY-00 04:04 4 000515 P4 ARS1 STD Wednesday AM 17-MAY-00 02:31 3 000516 P3 ARS1 STD Thursday AM 18-MAY-00 00:58 3 000517 P3 ARS1 STD Friday AM 18-MAY-00 23:25 2 000518 P2 ARS1 STD Saturday AM 20-MAY-00 01:16 4 000519 P4 ARS1 STD ====================================================================== 2.2 STT Timer setting The STT timer was reset during Pass 2 on Tue 16-May (UT) (ID: 000321-0414). ------------------------------------------------------------------------------- 3. Special Operations None. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None 4.2 DP Errors A DP Error found during pass 1 on Wed 17-May (ID: 000516-1547) which was recovered during pass 3 on the same day (ID: 000517-0206). 4.3 BCS Errors A so-called invisible (i.e., unflagged) error was discovered by the BCS Resident Scientist during passes 3 and 4 on Wed 17-May (IDs: 000517-0206, -0309). A BCS Recovery was carried out during pass 5 on the same day (ID: 000517-0412) which successfully cleared the error. 4.4 AOSLOS GD Printout Problem Despite a couple of attempts we were unable to print out the AOSLOS GD plots at SSOC using the standard method. We managed to print out the plots by another method given in the English language manual. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred (requested): =========================================================================== DSN/NASA Schedule Week Schedule Changes =========================================================================== Final 21 1(2) additions; 1 cancelation by DSN Final 22 2(0) additions; 3 cancelations (SSOC: 1; DSN: 2) Forecast 23 ?(3) additions; (1) cancelation by SSOC Strawman 24 (63) cancelations (Seko: 12, SSOC: 51) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_21)---- 113 76 0418 corrupted tape requested 26-Apr no response tape requested 08-May no response tape requested 10-May Closed/ same data ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule During week 21 Yohkoh lost 6 KSC passes to ASCA. During week 20 Yohkoh will lose 7 KSC passes to ASCA. ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: M. Akioka, T. Yamasaki KSC: M. Hagino, H. Tonooka 7.2 STT Timer Setting The next STT TIMER SET is due on 23-May-2000 (Tuesday). 7.3 OP OP and command sheets for Monday AM (JST) 22-May-00 have already been sent to KSC. We have prepared the OP and most of the command sheets for Tuesday, but the new tohbans must include the STT Timer Set commands in the real-time command sheets. 7.4 Testing of the 34 m antenna @ KSC This will be carried out during 21-24 May. Please check the additional print outs. We have prepared the OP for Tuesday taking these tests into account. 7.5 Holiday Schedule The next satellite holiday will be 28-May Sunday UT (= 29-May Monday JST). 7.6 Normal Pointing Yohkoh normal pointing adjustment commands should be issued as per the SXT Chief Observer's email instructions. 7.7 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. 7.8 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 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 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. ------------------------------------------------------------------------------ 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. ------------------------------------------------------------------------------ === END ===