SSOC Tohban Report for Week 36 (28-Aug-2000 to 3-Sep-2000) SSOC: T. Kobayashi, K. Shibasaki KSC: K. Matsuzaki, Y. Saito 0. Meeting Attendees Ogawara, Sakao, Watanabe, Hara, Kano Kobayashi, Watari, Kubo, Takeda. ------------------------------------------------------------------------------- 1. Solar Activity Solar Activity was rather low. No M-class flares occuered. The background level was kept below C level. Is the Sun really at its maximum activity phase this year? ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: ====================================================================== JST Day UT Start Time Pass Table ID ====================================================================== Monday AM 28-AUG-00 01:30 4 000827 P4 ARS1 DARK* Tuesday AM 28-AUG-00 23:55 3 000828 P3 ARS1 DIFF* Wednesday AM 30-AUG-00 00:02 3 000829 P3 ARS1 SPEC* Thursday AM 30-AUG-00 22:27 3 000830 P3 ARS1 SPEC* Friday AM 31-AUG-00 20:52 2 000831 P2 ARS1 SPEC* Saturday AM 01-SEP-00 22:42 3 000901 P3 ARS1 STD* ====================================================================== 2.2 STT Timer setting The STT timer was set during Pass 1 on Friday, 1-Sep-00 JST. The STT started tracking the Canopus after one week. ------------------------------------------------------------------------------- 3. Special Operations None ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors None 4.2 DP Errors Dp error '90' was detected during the 1st contact on Monday (28-AUG, 000827-1548). KSC Tohban reported the error to Nomura-san(Fujitsu) and the tohban recovered the error during the last contact(000828-0207). 4.3 BCS Errors None 4.4 S3500 Troubles The S3500 computer cannot get downlinked data due to the interface-board trouble. No QL can be done. This trouble happend during the first operation on Monday. It may take some time to repair. Without S3500, data QL can be done using the computer at SSOC thruogh the network. ------------------------------------------------------------------------------- 5. NASA Station Scheduling 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: =========================================================================== DSN/NASA Week Schedule Changes =========================================================================== Final 36 0 additions 1 cancellations Final 37 0 additions 1 cancellations Forecast 38 1 additions; 2 cancellations by SSOC Strawman 39 49 cancellations (Seko: 0, SSOC: 49) =========================================================================== 5.2 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2000/00_36)---- 225 46 2014 not received requested 22-Aug no response requested 24-Aug Closed/ correct data arrived 233 46 1242 not received requested 22-Aug no response requested 24-Aug Closed/ NO scheduled data 234 46 1108 not received requested 24-Aug Closed/ NO scheduled data 236 46 1122 not received requested 28-Aug Closed/ NO scheduled data 237 82 1856 not received requested 28-Aug Closed/ correct data arrived ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost 7 passes (6 to AKEBONO, 1 to ASCA). - There were 2 down-link-only passes on Sunday. - Yohkoh will lose 7 passes (7 to AKEBONO). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: S. Watari, S. Eto KSC: Y. Matsuzaki, T. Tamura 7.2 STT Timer Setting The next STT TIMER SET is due on 05-Sep-2000 (Tuesday) JST. (Pass ID: 000904-1236) 7.3 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) The next 34m antena operation holiday will be 11-Sep, Monday JST. 34m antena operations on 11-Sep-2000 (JST) are 15:14-15:27(UT) (00:14-00:27 JST) 20:21-20:33(UT) (05:21-05:33 JST) 7.4 OP OP and command sheets for Monday (04-Sep-2000 JST) were prepared and were sent to KSC. ------------------------------------------------------------------------------ 8. Unchanged Hikitsugi Items from Previous Weeks: 8.1 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.2 Software Problems PR_GEV with /hc keyword produces a temporary output file but does not print it at the printer. 8.3 OP_FIRST_GUESS Problem (1)(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. (2)(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. 8.4 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. 8.5 DSN Pass Additions (2000-w20) *** 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 cancellations 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. 8.6 OP Sequence for KSC Operation Using 34 m Antenna (2000-w24) KSC downlink operation with 34 m antenna has started since the end of May 2000. Since we cannot send any command to Yohkoh with 34 m antenna, the downlink operation is conducted with OP commands. 8.7 34m ANT Operation (2000-w33) 34m Operation will be done only on Sunday (=Yohkoh holiday) for up to 2 or 3 passes. There will be no 34m OP to compensate for the lost pass due to the conflict with the other satellites. For further details, please ask Kosugi-san. Note that 34m operation requires more CE slots in OP table than DSN operation does. Weekend OP cannot accomodate many 34m passes without sacrificing even more DSN passes. Maybe, a couple of other items should be added to the operation manual ( see 4.4 of w32-2000 report). 8.8 Max Elevation Max elevation must be higher than the following value: Contact Max El.(degrees) Wallops 6.5 Santiago 13.5 Others 7.0 8.9 OP and SXT Table Transfers Trouble(2000-w34) OP and SXT tables can not be transferred to KSC correctly when the MS computer at ISAS is in Initial Program Load(IPL). ASCA and HALCA groups operate the satellite from ISAS. We must not transfer OP and SXT tables in the following periods: "An hour before the beginning of HALCA/ASCA contact and an hour after the end of HALCA contact." As for IPL of MS computer at KSC, operators confirm if new OP and SXT tables come to MS computer at ISAS after the IPL. 8.10 Pass conflict issues In the operation meeting among ASCA, AKEBONO, HALCA, and YOHKOH, held on Thursday 31-Aug-00, ASCA group prpposed that (1)they used only one pass a day, time of which is located between 4 and 20 (JST), and that (2)they wouldn't use DSN contacts for ASCA operations. === END ===