SSOC Tohban Report for Week 5, 1996 (29 January - 4 February 1996) SSOC: H. Hudson, J. Lemen KSC : K. Fujiki, S. Yashiro 0. Meeting Attendants -------------------------------------------------------- 1. Solar Activity ------------------------------------------------------------ Solar activity was low, although a swarm of B-level microflares began to occur on about 1 Feb associated with AR 7944 (80 millionths spot area, beta, W limb at about Feb 3.5). 2. Standard Operations ------------------------------------------------------- 2.1 SXT table uploads Six SXT tables were uploaded: Date (JST) Pass# Table ID ------------------------------------------------- 29 Jan 2 960129 P2 ARS1 STD+LONG 31 Jan 3 960131 P3 ARS1 DKCAL 1 Feb 3 960201 P3 ARS1 STD+DIFFU 2 Feb 2 960202 P2 ARS0 CCD BAKE 3 Feb 4 960203 P4 ARS1 STD+LONG ------------------------------------------------ 2.2 STT timer setting STT Timer was set on 30-JAN-96 (JST) during pass 3 (ID: 960130-0310). 2.3 SXT terminator images and S/C offset pointings Date Time (UT) OG comment(OG#) ------------------------------------------------------------- **** there were no offpoint terminator images this week **** ------------------------------------------------------------- 2.4 OP_FIRST_GUESS Modification We modified op_first_guess to change the way the AOS antenna is selected in some cases. Suppose an A to B antenna change is due to occur some time shortly after an AOS. In the old scheme if the elevation of the KSC antenna were above 5 degrees, then the planned OG was AOS-A, otherwise it was scheduled as AOS-B. With the new algorithm if the A/B switch occurs within 1.5 min of the AOS, then the OG is AOS-B, otherwise it is AOS-A. 2.5 SXT CCD BAKE The SXT bakeout operation, originally planned for last week, was successfully carried out for one day (2-Feb => 3 Feb). The next bakeout probably should come in about May, pending analysis of these data by Acton_san in the meanwhile. 3. Errors and Problems ------------------------------------------------------- 3.1 SXT errors There were two bitmap errors: In Pass 1 on 31-Jan-96: 960131-0104 In Pass 1 on 1-Feb-96: 960201-0204 3.2 BCS errors There were no BCS errors 3.3 SXT Table transmission error An SXT table transmission miss occurred on 31 Jan., due to a lengthy test interval (1800-2230 JST) of the line between SSOC and KSC. Neither the tohbans nor the SXT chief observer were notified of this test interval. Shutoh-san was asked about the problem, and his response was that a senior Yohkoh official had been notified; the suspicion is that this senior Yohkoh official neglected to pass the information along. We suggest that until there is a better system for tracking this type of problem, the tohbans may wish to continue checking the line printer on the 3rd floor of B-toh to confirm successful transmission of key table information. The rearrangement of the 3rd floor operations room has put the line printer in the fourth position from the N end of the room. 3.4 KSC problem with SXT table confirmation On Tuesday and Wednesday, a modem at KSC was down and the SXT table confirmation via SXTSPT could therefore not be carried out. With the aid of Hara_san and Hori_san, the SSOC tohbans were able to do the Wednesday table confirmation. The problem at KSC appears to have been fixed because there were subsequent table confirmations. 4. DSN Communications -------------------------------------------------------- 4.1 DSN Final schedule for W05 There were no cancellations from the final schedule for week 5. 4.2 DSN Final schedule for W06 There was one cancellation from the final schedule of week 6, namely a Goldstone pass that was redundant with KSC operations. DSS-46 DOY 35/1326 was lost due to DSN cancellation (UARS emergency). 4.3 DSN Preliminary schedule for W07 There were no cancellations from the preliminary schedule for week 7. 4.4 DSN Strawman schedule for W08 Due to illness of the ASCA scheduler, the strawman cancellation list was postponed until Monday. Diem Tu was notified by e-mail and acknowledged the input. 4.5 Pass additions None. 4.6 Re-transmission requests and results Katano-san is now beginning to maintain a weekly file on the workstation (yohkoh flare 1 account, directory dsn_corrupt) to monitor the clerical information needed. January appears to have been particularly bad for Yohkoh and DSN, with 10-20% of the files requiring re-transmission. ASCA does not appear to have had any particular problem, and our inquiry at DSN was answered but did not disclose any pattern. Maybe the trouble will go away. According to this file system, Katano-san requested re-transmission of the following passes:. flare1:/home/flare1/yohkoh/dsn_corrupt/96_04 014 76 0524 not received. Requested 18 22 26 Jan. 014 16 0840 corrupted. Requested 18 22 26 Jan, no difference 015 16 0700 corrupted. Requested 18 22 Jan. 015 66 2003 corrupted. Requested 18 22 26 Jan 017 17 0105 corrupted. Requested 18 22 Jan. 017 66 2041 corrupted. Requested 18 22 Jan. 018 17 0449 corrupted. Requested 24 Jan. 020 66 1812 corrupted. Requested 24 Jan. 021 46 1732 corrupted. Requested 24 Jan. 022 16 0240 corrupted. Requested 24 Jan. 024 17 0135 corrupted. Requested 26 Jan. 024 16 0318 corrupted. Requested 26 Jan. 024 17 0154 corrupted. Requested 26 Jan. flare1:/home/flare1/yohkoh/dsn_corrupt/96_05 030 76 2106 100% corrupted. Requested 1 Feb. 031 17 0023 25% corrupted. Requested 1 Feb. This system is evolving and tohban input as to format, etc., would probably be useful. 4.7 New RASM/DSN procedures This week we have provided software that automatically copies the DSN schedule files from the JPL ftp server. go_dsnftp is a cron job that copies the DSN schedule files from the JPL ftp server. go_dsnftp runs automatically 8 times a day (at 07:25, 08:25, 09:25, 10:25, 11:25, 12:25, 14:25, 16:25 JST) and tries to copy any new files that JPL has put on line. The files that are copied are: 7dayss.wXX, forecast.wXX, and strawman.wXX. These files contain information for many spacecraft using the Deep Space Network. The information for Yohkoh is stripped out by an idl routine (fmt_rasm) to produce two files: solass.wXX -- read by op_first_guess rasmss.wXX -- edited printout file (auto printed in B-tou). go_dsnftp will only work on isass0 or flare20, since only these nodes have ftp access permission on the JPL server. It is run by a cron job, but it may also be run directly from flare20, if so desired. krasm can be used as a backup to retrieve files from JPL, but this will not normally be necessary. The only time it might be necessary is when the internet link is not available. One can check the status of the latest files that have arrived by typing the following command at the unix prompt: tail_dsn tail_dsn help (gives some additional information) krasm is required for sending deletions. Diem Tu has requested that we send forecast and strawman deletions by the following (3) methods: ftp to dsn.jpl.nasa.gov (optionally done by cancel_dsn) email to dsnsched@dsn.jpl.nasa.gov rasm (krasm -- use mail option 2 "Other Schedule Change") Once the stability of the ftp server has been demonstrated, Diem Tu may no longer require RASM inputs. His e-mail message requested that we use the above methods for approximately two more months. Real-time cancellations should continue to be sent by fax (Real-Time ops: +1-818-393-0612) and krasm (use mail option 1 "Current Week Schedule Change). 5. Yohkoh/ASCA Pass Conflicts at KSC ----------------------------------------- In W05, 6 passes were lost due to conflicts with ASCA. 6. Special Operations -------------------------------------------------------- SXT CCD bakeout, as described elsewhere. 7. Holiday Schedule ----------------------------------------------------------- The next holiday will be on Sunday, 11-Feb. 8. Hikitsugi Items ----------------------------------------------------------- 8.1 Tohbans for W06 KSC : K. Fujiki, S. Kawashima SSOC: K. Ichimoto, A. Sterling 8.2 STT timer setting The next STT timer set is due on 6-Feb-96 JST. 8.3 Offpoint terminator images If terminators appear in the OP generated by running OP_FIRST_GUESS, then the OP should be FAXed to the SXT_CO (Chief Observer) in D-toh. The SXT_CO will then inform the SSOC tohbans if offpointing will be carried out. If so, the OP will need be edited appropriately. 8.4 Transmission of OPs It is no longer necessary to confirm the transmission of OP/OG files to KSC by checking the printout on the 3rd floor in B-toh. Instead the time of transmission of the OP/OG files should be noted down. If the SSOC or KSC tohbans notice any failure in transmission of the OP/OG files then it should be reported to Shuto-san and Kosugi-san. Note that this is a discussion item for the WOM of 5 Feb. 1996, in view of the continuing misses in file transmission. 8.5 SXT patrol image dumps A block command `DP BC 8C-05 (hex)' should be executed whenever an SXT Table is uploaded. Since the Sun is very quiet, ARS parameters need to be checked by the SXT patrol images dumped by this command. 8.6 WWW server of DSN The DSN NOCC Information Server (NIS) is now on-line and available for DSN scheduling operations. The URL location is: http://dsn.jpl.nasa.gov/nss 8.7 Manual There are many changes in the manual of operations that will be required as a result of the activities of the Week 5 tohbans. Week 6 tohbans: Yoroshiku onegai shimasu! 8.8 Checklist We have reprinted the weekly checklist to reflect changes made this week. If other changes are needed, please let Lemen_san know ASAP. ------------------------------- End of Report ---------------------------------