SSOC Tohban Report for Week 40 (01-Oct-2001 -- 08-Oct-2001) SSOC Tohbans : T.Watanabe KSC Tohbans : H.Adachi, S.Morita@SSOC (2-6 Oct) 0. Meeting Attendees No WOM held on 8-Oct-2001, the Health-Sports (national) Holiday. ------------------------------------------------------------------------------- 1. Solar Activity Solar activity was decreasing from moderate to low last week. Two M-class flares occurred during the week. A long-duration M9 flare occurred at 01/0515 UTC in the vicinity of Region 9628 (S22W91). This flare produced a full halo CME. An optically uncorrelated M2 flare occurred at 06/0525UTC. This event also produced a CME off of the sun's west limb. ------------------------------------------------------------------------------- 2. Standard Operations 2.1 SXT Table Uploads The following SXT tables were uploaded: JST Day UT Start Time Pass Table ID ==================================================================== Monday AM 23-SEP-01 23:58 2 010923 P2 ARS1 DFF* Monday AM 30-SEP-01 20:18 2 010930 P2 ARS1 DFF* Monday AM 30-SEP-01 23:41 4 010930 P4 ARS1 DRK* Tuesday AM 01-OCT-01 20:16 2 011001 P2 ARS1 STD* Wednesday AM 02-OCT-01 20:13 2 011002 P2 ARS1 JOP* Thursday AM 03-OCT-01 18:29 2 011003 P2 ARS1 JOP* Friday AM 04-OCT-01 18:26 2 011004 P2 ARS1 JOP* Saturday AM 05-OCT-01 18:24 2 011005 P2 ARS1 STD* ==================================================================== 2.2 STT Timer Setting The STT timer was stopped during pass 2 (Pass ID: 011001-1341) on Tue 2-Oct-2001 (JST). It restarted pass 1 (Pass ID : 011001-1341). ------------------------------------------------------------------------------- 3. Special Operation: 3.1 Canopus Re-tracking During the eclipse period, the spacecraft rotated about 10 degrees around the Z-axis. On Friday, the attitude determination by GAS and SXT images showed consistently that the Z-axis rotated about 2.2-2.8 deg since the STT shutdown on Tuesday. STT map taking operation in the Saturday OP failed, because of a wrong coding in the AOSLOS programme, which was revealed last time, and SSOC tohban forgot. Nevertheless, the predictions of the experts (Kano and Seko) was accurate enough to have Canopus in the middle of the tracking area and at pass 3 (011007-1341), Yohkoh returned tracking Canopus properly. 3.2 Y gyro check Y gyro will be turned on and its performance testing is scheduled during Thursday (11th) passes. ------------------------------------------------------------------------------- 4. Errors and Problems 4.1 SXT Errors: None 4.2 DP Errors: None 4.3 BCS Errors: None 4.4 DSN Tracking: No report ------------------------------------------------------------------------------- 5. NASA Station Schedule 5.1 Contact Pass Cancellations/Additions The following schedule changes occurred: ========================================================================= Week Schedule Changes ========================================================================= Real-Time 40 4 cancellations Final 41 1 cancellations requested Preliminary 42 0 cancellations Strawman 43 66 cancellations ========================================================================= 5.2 Contacts this week and next (see 8.12): Week Wallops Santiago Goldstone Canberra Madrid NASA Japan 40 28 0 3 0 7 38 30 41 28 2 7 0 7 44 34 5.3 Data Transmission from NASA Ground Stations ----(Copied from /home/flare1/yohkoh/dsn_corrupt/2001/01_40)---- 255 80 2154 not received requested 17-Sep no response 25-Sep Closed/ No data This data is corrupted and unrecovarable for retransmission. 256 82 1811-1821 10647 blocks LOW BLOCK COUNT DUE TO ANTENNA RUNNING INTO THE CABLE WRAP LIMITS AT AOS. 268 C46 1018-1029 8594 blocks LOSS OF TLM,MFR OUTPUT INCORRECTLY CONFIGURED AT BASEBAND PATCH PANEL. CORRECTED PATCHING AND LOCKED TLM. 270 66 0607 missing data requested 03-Oct 266 80 1425 missing data tape requested 04-OCt 270 80 1054 missing data tape requested 04-Oct 274 80 1225 missing data tape requested 04-Oct 268 80 1420 not received requested 04-Oct 276 80 1038 not received requested 04-Oct @@ Hudson_san asked me to resend the retransmission request of the following data to Wallops. I requested them 3 times(17-, 25-Sep, and 02-Oct). DOY255(12-Sep) 1813 - 1823 1953 - 2004 2314 - 2325 DOY256(13-Sep) 1811 - 1821 1951 - 2002 2133 - 2143 2314 - 2323 DOY257(14-Sep) 1629 - 1637 1809 - 1820 1949 - 2000 2131 - 2142 ------------------------------------------------------------------------------ 6. KSC Pass Conflicts and Schedule : Two passes lost to Akebono. : Three passes will be lost to HALCA. ------------------------------------------------------------------------------ 7. Hikitsugi Items 7.1 Tohbans for Next Week SSOC Tohbans : N.Shinohara, T.Miyawaki KSC Tohbans : K.Kobayashi, S.Ohto 7.2 STT Timer Setting The STT Timer Set is due on Tuesday 16-Oct-2001 (JST). 7.3 Holiday Schedule The next holiday is Sunday 14-Oct-01 (JST). The 34m-antenna operations are scheduled for pass 1 (12:52 UT) and pass 4 (17:56 UT). These operations will be downlink only. 7.4 STT MAP operation in OP (see 8.10) Note that we have stopped the STT MAP commands and operations in the OPs. 7.5 The OP and the command sheets for today The OP and command sheets for Tuesday morning (Oct-9 JST) have been already been checked and sent to KSC. ------------------------------------------------------------------------------ 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 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. 8.12 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]