SSOC Tohban Report for Week 09 (26-Feb-2001 to 04-Mar-2001) SSOC: M. Shimojo, T. Naito(ex.28,2) KSC: S.Akiyama, T. Ishii 0. Meeting Attendees H. Hara, T. Kosugi, Y. Matsumoto, M. Miyashita, N.V. Nitta, T. Sakao, M. Shimojo, A. Takeda, T. Watanabe ------------------------------------------------------------------------------- 1. Solar Activity The solar activity in week 09 is very low. Only seven C1 flares occurred in this week and the backgroud level is about B6. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ====================================================================== Tuesday PM 27-FEB-01 03:37 1 010227 P1 ARS2 DARK137 Tuesday PM 27-FEB-01 08:42 4 010227 P4 ARS0 DIF+137 Wednesday PM 28-FEB-01 05:22 2 010228 P2 ARS0 JOP137 Wednesday PM 28-FEB-01 08:45 4 010228 P4 ARS1 STD Tuesday PM 01-MAR-01 05:24 2 010301 P2 ARS0 JOP137 Tuesday PM 01-MAR-01 08:48 4 010301 P4 ARS1 STD Friday PM 02-MAR-01 07:09 4 010302 P4 ARS2 VLA Saturday PM 03-MAR-02 03:48 2 010303 P2 ARS1 STD ====================================================================== 2.2 STT Timer Setting The STT timer set was done on Tuesday, 27-February-2001 (PASS #: 010227-0411). ------------------------------------------------------------------------------- 3. Special Operations 3.1 Normal pointing In first pass on 01-Mar-01, we upload new OG for normal pointing and executed the ROG. The cordinate of normal pointing is W 1.54, N2.28. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors A SXT "FILT ST" Error occured on pass 5 of 01-Mar-01 (pass #010301-0721). It was recoverd by SXT recovery plan on pass 1 and pass 2 of 02-Mar-01. 4.2 DP Errors A DP (A3) Error occured on pass 4 of 01-Mar-01 (pass #010301-0618) It was recovered on pass 5 of the same day. 4.3 BCS Errors A BCS Error occured on pass 2 of 03-MAR-01 (pass #010303-0308). It was recorverd on pass 3 of the same day. ------------------------------------------------------------------------------- 5. NASA Station Schedule 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred and/or requested: ======================================================================= DSN/NASA Week Schedule Changes ======================================================================= Real-Time 09 1 cancellation (by SSOC) Final 10 4 additions (by SSOC) Preliminary 11 0 cancellations (by SSOC) Strawman 12 58 cancellations (by SSOC) ======================================================================= 5.2 Contacts this week and next (see 8.13): Week Wallops Santiago Goldstone Canberra Madrid NASA Japan 10 25 0 0 8 0 33 28 11 29 3 20 2 5 40 5.3 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2001/01_09)---- 046 82 2239 not received requested 21-FEb Closed/ correct data 043 66 2104 missing data requested 27-Feb Closed/ correct data * Sirius entry mistake. It was correct data. 047 82 0524 corrupted tape requested 27-Feb Closed/ correct data 048 82 0527 corrupted tape requested 27-Feb Closed/ correct data 052 82 2112 corrupted tape requested 27-Feb Closed/ correct data 052 82 2253 corrupted tape requested 27-Feb Closed/ correct data 051 16 0525 missing data requested 27-Feb no response requested 02-Mar 051 46 1848 missing data requested 27-Feb no response requested 02-Mar 053 46 1712 missing data requested 02-Mar ------------------------------------------------------------------------------- 6. KSC Pass Conflicts and Schedule - Yohkoh lost a total of 1 passes (all for HALCA). - Yohkoh will lose total of 4 pass (for HALCA). ------------------------------------------------------------------------------- 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC: H. Hara, M. Miyashita KSC: S. Akiyama, Hagino(9-), T. Ishii(-5) 7.2 STT Timer Setting The STT Timer Setting is due on Tuesday, 6-MAR-01. 7.3 Please continue to take STT MAP every day (see 8.11). 7.4 Holiday Schedule (KSC 34m antenna TEL: 0994-67-3152) No 34m passes for power outage (see: 7.5) 7.5 KSC Electric Power Outage 3/11 (Sunday) 8:30 - 18:00 (JST) 34 m antenna operation will not be performed. Please keep Santiago passes on that day. ------------------------------------------------------------------------------ 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. (3)(2001-w06) OP_FIRST_GUESS frequently got confused about start times, trying to read weekly files extending forward years from the present. Re-tries eventually worked. 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 (Actually it is now available until end of 2000) (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 cancellations). 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 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. Due to the narrow antenna beam, acquision of the signal from the satellite at the first contact need some time. It is suggested that the KSC REPRO should start one minutes later compared to the 20 m operation. (w46) Also, max elevation of the 34 m antenna should be checked carefully using Weekly Visible Diagram (do not trust op_first_guess nor AOSLOS listing). Max elevation should be less than 76 degree. (w46) 8.7 Weekend DSN passes (2000-w49) We used to schedule 12 DSN passes during the weekend, but now we have two passes with the KSC 34m antenna. So only 9 or 10 DSN passes should be scheduled for the weekend. Please be sure to cancel extra passes as early as possible. 8.8 DSN Max Elevation DSN max elevation must be higher than the following value: Contact Max El.(degrees) Madrid 10.0 (2000-w45) Santiago 13.5 (2000-w44) Wallops 6.5 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 proposed 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. 8.11 STT MAP operation in OP (2000-w42, revised at 2000-w53, 2001-w08) If possible, please schedule the STT MAP operation just before the 1st KSC Pass on next day. The OP commands to be insrted in OP are as follows; OG-030(DEC) CMPN OBS ON OG-035(DEC) STT EVENT OFF ; 1 step after CMPN OBS ON OG-117(DEC) STT MAP START ; 1 step after STT EVENT OFF OG-118(DEC) STT MAP END ; 5 min (10steps) after STT MAP START OG-036(DEC) STT EVENT ON ; 1 step after STT MAP END OG-031(DEC) CMPN OBS OFF ; 1 step after STT EVENT ON Plese insert these command manually in OP schedule. The timing of these commands must be assigned around the mid-time of Canopus tracking window (note that the Canopus tracking does not work normally in this window). It is prefer that the command work during the night period of the satellite. The Canopus tracking window appears on the AOSLOSGD plots as a dotted line. It is preferable to schedule the 10 steps contiguously (as shown, avoiding mode switches). 8.12 Bug-fix Report about the Attitude Determination Software (ADS) at 200-w53 Related with the Y2K problem, a software bug was found in the attitude detection software. The problem occured in the procedure to search the orbital element file. In the program including the bug, the attitude of the Yohkoh satellite was calculated using the latest orbital elements in DASD or Serius database, while it must be done using the elements of the day nearest to the observation date. This buf has been fixed now. This bug causes the large attitude error when the observation date and the calculation date of the attitude are largely different. From 2000 Jan. to 2000 Sep., there are 10 candidates with the attitude error greater than one minutes of arc, which are as follows (obs. date); 27-Apr-2000, 28-Apr-2000, 13-Sep-2000, 14-Sep-2000, 7-Jan-2000, 11-Sep-2000, 9-Mar-2000, 8-Jan-2000, 28-Sep-2000, 12-Sep-2000. Re-calculation of the attitude is scheduled to these 10 cases. 8.13 print_contact (2001-w07) It's helpful to see the actual statistics of the DSN/Wallops station passes. The program "PRINT_CONTACTS" does this for inclusion in the weekly report, e.g. IDL> print_contacts,[6,7] lists the passes for weeks 6 and 7. [end of report]