SSOC Tohban Report for Week 48 (26-Nov-2001 -- 02-DEC-2001) SSOC Tohbans : J. I. Khan, Y. Sakamoto KSC Tohbans : H. Sekiguchi, K. Kawamoto 0. Meeting Attendees J. I. Khan, T. Kosugi, D. E. McKenzie, Y. Ogawara, J. Sato, A. Takeda, T. Watanabe, K. Yoshimura ------------------------------------------------------------------------------ 1. Solar Activity Solar activity was moderate-high. There were 13 M-class flares last week. An interesting apparently very non-radial ejective event was observed on 30-Nov-01 possibly associated with the GOES M1.5 (LDE) flare starting near 14:00 UT. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ==================================================================== Tuesday AM 26-NOV-01 20:17 4 011126 P4 ARS1 DARK Wednesday AM 27-NOV-01 15:07 1 011127 P1 ARS1 STD Thursday AM 28-NOV-01 13:21 1 011128 P1 ARS1 DIFF Thursday AM 28-NOV-01 18:25 4 011128 P4 ARS1 STD Friday AM 29-NOV-01 16:38 3 011129 P3 ARS1 STD Saturday AM 30-NOV-01 16:33 3 011130 P3 ARS1 STD Sunday AM 01-DEC-01 14:46 2 011201 P2 ARS1 STD ==================================================================== 2.2 STT Timer Setting Due to Yohkoh entering a period of Canopus eclipse, the STT Timer was stopped during the first pass on Monday 26-Nov (ID: 011126-1031). The STT Timer was started at about 02:09 UT on 2-Dec via a special OG command in the Weekend OP. ------------------------------------------------------------------------------- 3. Special Operation: 3.1 Z-axis Maneuver Prior to uploading the OP with the OG command for the STT Timer Start/Set the Yohkoh satellite was rotated by 10 degrees counterclockwise using real-time commands on pass 2 of Sat 01-Dec (ID: 011201-1031). 3.2 BCS Calibrations: A BCS Stim Calibration was carried during pass 011127-1237. BCS Source Calibrations were carried out on 27-Nov-01 at 16:43, 19:52, & 21:30 UT. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors : Bit Map Error was detected on a pass 011128-0927. Recovery was performed successfully during the same pass. 4.2 DP Errors : None 4.3 BCS Errors : None ------------------------------------------------------------------------------- 5. NASA Station Schedule 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred: ========================================================================= Week Schedule Changes ========================================================================= Real-Time 48 3 cancellations (One necessary because of a sudden UNREQUESTED addition by DSN) 1 addition requested by SSOC (1 accepted) Final 49 3 cancellations, 5 additions requested (2 accepted) Preliminary 50 1 cancellation & 1 unrequested addition (by DSN) 9 additions requested by SSOC (3 accepted) Strawman 51 43 cancellations ========================================================================= 5.2 Contacts this week and next (see 8.12): Week Wallops Santiago Goldstone Canberra Madrid NASA Japan 48 24 1 0 0 11 36 22 49 30 5 0 0 8 43 25 5.3 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2001/01_48)---- 302 74 1246 not received requested 07-Nov no response requested 12-Nov no response requested 14-Nov no response requested 26-Nov Closed/ correct data 305 82 1928 not received requested 12-Nov no response requested 14-Nov no response requested 26-Nov Closed/ correct data 309 82 1727 corrupted tape requested 19-Nov no response tape requested 26-Nov Closed/ same data POOR DATA QUALITY THROUGHOUT PASS DUE TO WHAT IS BELIEVED TO BE ACQ DATA. HAD PROBLEM AT AOS AND CONTINUED FOR 1ST HALF OF SUPPORT PERIOD. 317 80 1149 corrupted tape requested 19-Nov no response tape requested 26-Nov Closed/ correct data 317 82 1651 not received requested 29-Nov 321 80 1310 corrupted tape requested 29-Nov Closed/ correct data 322 80 0944 corrupted tape requested 29-Nov Closed/ correct data 322 80 1124 corrupted tape requested 29-Nov Closed/ correct data 325 80 0929 not received requested 29-Nov 325 80 1110 not received requested 29-Nov Closed/ correct data 325 80 1251 not received requested 29-Nov Closed/ correct data 326 80 0924 corrupted tape requested 29-Nov Closed/ correct data 326 80 1246 corrupted tape requested 29-Nov Closed/ correct data 327 80 1100 corrupted tape requested 29-Nov DOY-320 C46 0911 - 0925 : No Data STATION POWER FAILURE OCCURRED AT 0850Z. POWER RESTORED WITH DIESEL GENERATOR. UNABLE TO CONFIGURE EQUIPMENT PRIOR TO EOT. DOY-330 M66 0416 - 0427 : No Data Receivers were in lock during the whole pass, but TCP did not get lock on the dump data. No dump data observed on the scope. ## SSOC toban canceled this Madrid data on 26-Nov. DOY-332 W80 0853 - 0904 : 17755 blocks. 9 METER ACQ DATA MISSING. LOADED A NOPS FOR DAY 332 AND ACQUIRED. DATA WAS DEGRADED, POSSIBLY DUE TO LOW ELEVATION. ***** DSN data <2001.10> ****** Total passes Acquiring rate Goldstone 18 83.63% Canberra 3 66.59% Madrid 20 92.80% Wallops 125 99.19% Santiago 7 95.11% ------------------------------------------------------------------------------ 6. KSC Pass Conflicts and Schedule : 10 conflicts (4 for HALCA and 6 for AKEBONO) : 8 conflicts (6 for HALCA and 2 for AKEBONO) ------------------------------------------------------------------------------ 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC Tohbans : N. Shinohara & T. Shimizu KSC Tohbans : K. Kawamoto & K. Shinoda 7.2 STT Timer Setting The STT Timer Set is due on Monday 10-Dec.-2001 (JST). 7.3 Holiday Schedule The next holiday is Sunday 9-Dec-2001 (UT). In this day we have to use the 20m-antenna because the 34m-antenna will stop for a maintenance. The operations are scheduled in two passes, starting from 08:56 UT and 13:59 UT,respectively. These operations will be downlink only. 7.4 The OP and the command sheets for today The OP and command sheets for Monday (03 Dec. JST) were already prepared and checked by SSOC and KSC tohbans. The OP has been transferred to KSC this morning. 7.5 DSN downlink scheduling Handover White Sands (WOTIS) took over the responsibility for the Yohkoh DSN downlink scheduling. From W46, all DSN contacts should be made through WOTIS. We noticed several problems last week with the schedules from WOTIS and future tohbans are advised to be vigilant in checking the schedules. --We found WOTIS confused the DOY in an addition request -requiring an urgent cancellation request. --We also found that some schedules did not have the Change Log properly labeled requiring manual editing of the files to be able to read them with op_first_guess. (WOTIS headed both sections under separate headings of ACTIVITIES LISTING -watch out for this in the future). 7.6 SXT tohban contact The SXT_COs have moved from D-toh to new A-toh 7F. New phone number is ex. 6162, and temporary fax number is 8526. 7.7 Long term schedules (1) 34m Ranging Testing A few number of DC uplinks from the 34m system and downlinks via the 20m system will be possible in the following two passes dedicated to the testing. 11-Dec-01 13:51-14:04 UT and 12-Dec-01 12:04-12:18 UT (2) Year-end and Year-begin Yohkoh operation ends at 29-Dec-01 5:18- 5:30 UT and resumes at 4-Jan-02 20:07-20:19 UT. (3) DASH Launch A piggyback mission DASH will be launched by HIIA at 3:00 UT, 31-Jan-02. Both 34m and 20m dishes at KSC will stand-by as ain and "hot-backup" systems from Y-9 to Y+3 days. A few schedule conflicts with Yohkoh operation will be adjusted at the next meeting in January. (4) For the long term schedule Yohkoh will get five passes on 13 Dec. but we will lose one of these pass for other satellites. ------------------------------------------------------------------------------ 8. Unchanged Hikitsugi Items from Previous Weeks: 8.01 DSN Pass Additions (2000-w20; modified 2001-w10) >>>>>*** DON'T FORGET TO REQUEST PASS ADDITIONS!!! ***<<<<<<< Yohkoh loses DSN passes as follows: (1) Canceled by the SSOC tohbans (2) 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 (2) could be replaced by ones from case (1). -------------- Thus it may be possible to request pass additions for the PRELIMINARY and FINAL week schedules from the [case (1)] STRAWMAN cancellations. Only request additions from the crossed out cancellations done by SSOC. The routine to use is ADD_DSN: e.g., IDL> add_dsn, 28, /prelim 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. 8.02 Weekend Terminators If possible, please schedule terminator opportunities on any weekend table (i.e., if room permits). 8.03 Software Problems PR_GEV with /hc keyword produces a temporary output file but doesn't print it at the printer. 8.04 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. Retries eventually worked. 8.05 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. 8.06 34m ANT Operation (2000-w33, 20001-w12) 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 accommodate many 34m passes without sacrificing even more DSN passes. 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). Try to avoid zenith passes ( Max. El. >76 degree) in planning. However, do not try to change the already fixed schedule just because the pass chosen turns out to be a zenith pass. There's no problem using the zenith pass with extra few op commands. (2001-w12) 8.07 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. 8.08 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 (Depends on azimuth. See the map on whiteboard.) Others 7.0 8.09 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). HALCA groups operate the satellite from ISAS. SSOC tohbans must be careful to transfer OP and SXT tables in the following periods, an hour before the beginning 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 STT MAP operation in OP (2000-w42, revised at 2000-w53, 2001-w08, 2001-w24) Since 2001-w25, we will stop the daily STT MAP operation in OP. 8.11 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 occurred 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 Sirius database, while it must be done using the elements of the day nearest to the observation date. This bug 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 2000Jan. 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. 8.12 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]