SSOC Tohban Report for Week 15 (7 April - 13 April 1997) SSOC : Y. Saito & S. Yashiro KSC : M. Shimojo & M. Yamamoto 0. Meeting Attendance: J. Khan, D. Alexander, H. Hara, T Watanabe, H. Hudson, M. Sawa, L. Culhane, C. Foley, S. Yashiro 1. Solar Activity: Solar activity was quiet. Soft X-rays from the sun kept around the GOES A5-level for most of the time. The C7 flare occured at around 14:00 on 7-April, and was observed by Yohkoh in flare mode. Unfortunately the rise phase was not observed due to Yohkoh night. 2. Standard Operation: 2.1 SXT Table Uploads: ------------------------------------------------------------ Pass ID Pass # Table ID ------------------------------------------------------------ Monday 970407-1135 4 970407 P4 ARS1 STD Tuesday 970408-1239 5 970408 P5 ARS1 DKCAL Wednesday 970409-0826 2 970409 P2 ARS1 STD+DIFF Thursday 970410-0826 2 970410 P2 ARS1 STD ------------------------------------------------------------ 2.2 STT timer setting: The STT timer was set during pass 5 (ID: 970408-1239) on 08-Apr-97 (Tue). 2.3 Offpointing for Terminators ----------------------------- Date Time S/C Pointing ----------------------------- no offset pointing ----------------------------- 3. Errors and Problems 3.1 BCS Errors and Problems: No BCS errors were detected last week. 3.2 SXT Errors and Problems: SXT error was detected twice last week and recovered. An SXT error was detected during pass 5 (ID: 970407-1238) on 7-Apr. Yobi-command A and Yobi-command B issued in the same pass, and SXT recovery was successfully completed during the pass 1 (ID: 970408-0825) on 8-Apr. An SXT errors occurred during 1st pass (ID: 970411-0720) and 5th pass (ID: 970411-1134) on 11-Apr. Yobi-command A and Yobi-command B issued in the same pass, and SXT recovery was successfully completed during the pass 1 (ID: 970412-0721) on 12-Apr. 3.4 Others None. 4. DSN Communications: 4.1 DSN Final schedule for W16: 7 passes were canceled by SSOC. 4.2 DSN Preliminary schedule for W17: 2 passes were canceled by SSOC. 4.3 DSN Strawman schedule for W18: Because the strawman schedule for W18 was not arrived, We can not cancel it. 4.4 Data Transmission from DSN: (/home/flare1/yohkoh/dsn_corrupt/97_15) 085 17 1714 corrupted tape Requested 31 Mar. Closed/same data 095 76 0324 corrupted tape Requested 08 Apr. Closed / correct data 5. YOHKOH/ASCA/AKEBONO/HALCA Pass Conflicts at KSC: 5.1 Canceled passes for W15, 16 Week 15: 10 passes were canceled for HALCA. Week 16: 8 passes will be canceled for HALCA. 6. Special Operations: There was an HXT calibration between 9-Apr-97 and 12-Apr-97. PASS ID: 970409-0722, -0826, -0929 970410-0826, -0930, 970412-0824 7. Holiday Schedule: The next holiday will be 20-April-1997. 8. Hikitsugi Items: 8.1 Tohbans for W16 SSOC: J. Khan & D. Alexander KSC: M. Yamamoto & S. Tanuma 8.2 STT Timer setting The STT timer set is due on Tuesday (15-Apr.-97). 8.3 Sirius Data Nothing to report. 8.4 Suggestion to DSN selection rule: mail from JPL I understand that you access RASM and choose the passes that are made available to you. We would like you to use the Wallops (WFF) passes as much as possible. In other words, if a pass from one of the DSN sites (Goldstone, Madrid or Canberra) can be substituted by a WFF pass, please use the WFF pass and delete the DSN pass, instead of vise versa. Please understand we are not asking you to give up any coverage but if the same coverage can be accomplished by using WFF instead of the DSN, we would like you to do so. (Albert Chang) 8.5 Changes in OP_FIRST_GUESS Lemen-san has made a modification of the op_first_guess to surpress Campaign obs. between the first and second passes of KSC on the next day. Now the version is 4.3 and it seems to be working well. Regarding other more important changes, please see the reports from week 10.