SSOC Tohban Report for Week 10 (28-Feb-2000 to 05-Mar-2000) SSOC: K. Fujiki, T. Ishii KSC: H. Kozu, Y. Yamauchi 0. Meeting Attendees D. McKenzie, T. Sakao, T. Shimizu, T. Ishii ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was moderate except for 02-Mar and 03-Mar. A X1.1 flare occurred on 02-Mar in NOAA 8882, where several flares were reported. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Tuesday AM 28-Feb-00 18:00 4 000228 P4 ARS1 STD Tuesday PM 29-Feb-00 11:22 1 000229 P1 ARS1 STD Wednesday AM 29-Feb-00 16:28 4 000229 P4 ARS1 DKCAL Wednesday PM 01-Mar-00 13:15 2 000301 P2 ARS1 DIFF Thursday PM 02-Mar-00 13:26 3 000302 P3 ARS1 STD Saturday PM 04-Mar-00 13:48 3 000304 P3 ARS1 STD ====================================================================== 2.2 STT Timer setting STT timer was re-set and started during Pass 4, 000229-1033, on 29-Feb-2000 (UT). The next timer setting should be done on 07-Mar-2000. ------------------------------------------------------------------------------- 3. Special Operations The normal pointing of Yohkoh was updated: ===================================================================== Pass ID Date (JST) Comment ===================================================================== 000301-0824 01-Mar-2000 S/C W.768 N1.79 000303-0721 03-Mar-2000 S/C W1.61 N1.72 ===================================================================== ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 BCS Errors: A BCS error was found during pass 1 (000302-0721) on 02-Mar-2000 (UT). This error was recovered from pass 3 through pass 5 on the same day. 4.2 SXT Errors: A Bit-map error occurred during pass 1 (000229-0723) on 29-Feb-2000 (UT) and was cleared by executing Yobi-C commands during the same pass. 4.3 DP 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 =========================================================================== Final 10 0 Additions Requested: 0 Given: 2 Cancelations Final 11 0 Additions Requested: 0 Given; 5 Cancelations Preliminary 12 0 Additions Requested: 0 Given; 0 Cancelation Strawman 13 67 Cancelations: 14 by Seko-san, 53 by SSOC =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copy from /home/flare1/yohkoh/dsn_corrupt/2000/00_10)---- 043 76 0850 corrupted tape requested 15-Feb no response tape requested 18-Feb no response tape requested 22-Feb no response tape requested 25-Feb no response tape requested 01-Mar Closed/ same data 043 76 1030 corrupted tape requested 15-Feb no response tape requested 18-Feb no response tape requested 22-Feb no response tape requested 25-Feb no response tape requested 01-Mar Closed/ same data 043 82 1537 corrupted tape requested 15-Feb no response tape requested 18-Feb no response tape requested 22-Feb no response tape requested 25-Feb no response tape requested 01-Mar Closed/ correct data 048 76 0802 corrupted tape requested 22-Feb no response tape requested 25-Feb no response tape requested 01-Mar Closed/ give up. ## There is no data to play back on the support. WLP Scheduling-san is still looking into what happened to the data for ID 5865. 054 82 0907 corrupted tape requested 25-Feb Closed/ correct data 054 74 2115 not received requested 28-Feb Closed/ correct data 060 w82 0832 - 0841 : 15112 blocks Dump on at AOS, pass only 8.3 degree MaxEl. ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule In Week 10, we lost 11 KSC contacts: Halca: 4, ASCA: 7 In Week 11, we will lose 9 KSC contacts: ASCA: 7, Akebono: 2 ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for next Week SSOC: T. Shimizu, N. Shinohara KSC: Y. Yamauchi, S. Yashiro 7.2 STT Timer Setting The next STT TIMER SET is due on Tuesday '07-Mar-2000 (UT)'. 7.3 OP OP for 06-Mar has already been prepared and transferred to KSC by W10 SSOC tohbans. 7.4 Holiday Schedule Next Yohkoh holiday will be Sunday, 12-Mar-00 (JST). 7.5 Meeting for long-term scheduling among Harca, Asca, and Yohkoh Will be held on March 26. 7.6 New Orbital Elements The arrival date of new orbital elements at SIRIUS was changed to Tuesday. ------------------------------------------------------------------------------- 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 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 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 (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. 8.6 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. 8.7 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. 8.8 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. 8.9 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. ---------------------------------------------------------------------------- 9. 'Leap year' related problems 9.1. AOSLOS and AOSLOSGD in KSC Each day from February 29 is dated the next day, i.e., March 1 for February 29, March 2 for March 1, etc. === END ===