SSOC Tohban Report for Week 15_95 ( 10 APR - 17 APR 1995) SSOC : Sato, J., Koshiishi, H. KSC : Yasuno, S., Sakao, T. 1. Solar Activity ----------------------------------------------------- Activity was not low. There were several C-class flares in NOAA7863 2. Standard Operations ------------------------------------------------ 2.1 SXT Table Uploads : 3 times --------------------------------------------------------------------- KSC Time (start) Pass# Table ID --------------------------------------------------------------------- 13-APR-95 10:38 JST 4 950413 P4 ARS1 DKCAL 14-APR-95 05:48 JST 1 950413 P1 ARS1 STD+LONG 15-APR-95 04:26 JST 1 950414 P1 ARS1 STD+LONG --------------------------------------------------------------------- 2.2 STT Timer Set The STT Timer was set on pass #3 on Tuesday, 11-APR. The next setting will need to be on Tuesday, 18-APR. 2.3 S/C off pointing There were 6 offpointings in week 15. The performed time and day are as follows. 10 APR 14:23 - 14:43 UT : OG 85 S/C W03 N02 11 APR 13:05 - 13:23 UT : OG 86 S/C E04 N00 12 APR 13:23 - 13:43 UT : OG 34 S/C W17 N00 12 APR 15:00 - 15:24 UT : OG 35 S/C W10 S01 13 APR 12:05 - 12:22 UT : OG 36 S/C W04 N00 13 APR 13:42 - 14:05 UT : OG 85 S/C W03 N02 3. Errors & Problems ------------------------------------------------- 3.1 SXT and BCS errors The SXT "INVALID MAIL ERROR" occurred through both Pass 3 and Pass 4 on Wednesday,12-APR. These errors were , however, induced intentionally by the "SXT NEW RECOVERY TEST" carried out in the same passes, and were intrinsically recovered by this recovery plan. The BCS error was detected in Pass 1 on Monday, 17-APR and was successfully recovered in Pass 2. 3.2 G150 trouble G150, for check of SXT table through KSC operation at KSC, had been having the trouble in data transmission since the beginning of week 15. The three SXT tables planned to upload on Tuesday and Wednesday, therefore, could not be uploaded. The repair of the trouble was completed on Wednesday, 12-APR evening. 3.3 OG write failure The OP+OG(#07) was prepared to upload in Pass 1 on Wednesday,12-APR. However, the OG was not revised by the planner. The KSC tohbans found the fact and decided to upload only OP(#07) in Pass 1. But they misunderstood that the current running OP would be OP(#06) and sent the command of "OP-CONTINUE" for "OP-START" through Pass 1 operation, though they actually uploaded OP(#07) in Pass 1. This mistake was perceived and the command of "OP-STOP" and "OP-CONTINUE" were sent again in Pass 2 to set the correct OP(#07) address. No remarkable problems on Yohkoh were caused by this mistake between Pass 1 and Pass 2. 4. DSN Communications ------------------------------------------------------ 4.1 DSN Strawman Schedule for W18 We canceled 58 DSN contacts from the strawman schedule. 4.2 DSN Forecast Schedule for W17 We canceled 15 DSN contacts from the forecast schedule. 4.3 DSN Final Schedule for W16 We canceled 1 DSN contact from the final schedule. 4.4 DSN Final Schedule for W15 We canceled 1 DSN contact from the final schedule. 4.5 Post-pass transmission report for Wallops station Previous SSOC tohbans reported that the w13 tohbans requested to send the Post-pass transmission report from Wallops station by fax, but it had not been received yet, then, they requested it again on 7-APR. It have not been received yet. We re-requested it again on 15-APR. 4.6 Pass addition No pass addition request was needed in week 15. 5. YOHKOH/ASCA/SFU Pass Conflicts at KSC ------------------------------------ In week 15, we lost 7 KSC passes due to the ASCA conflicts. In week 16, 7 passes will be lost due to the ASCA conflicts. 6. Special operation ----------------------------------------------------- The new SXT recovery plan was tested on Wednesday,12-APR at the third and the fourth KSC contacts. Though the several operation mistakes happened, the whole performance of the plan was recognized to work well. The SXT recovery plan and the manuals about the SXT recovery at KSC are going to be revised on the basis of the new plan. 7. Holiday Schedule -------------------------------------------------- The next operation holiday will be on Sunday, 23-APR. 8. Hikitsugi Items -------------------------------------------------- 8.1 Tohbans for Week 16 KSC : Sakao, T., Yokoyama, T. SSOC : Irie, M., Nishio, M. 8.2 STT timer setting The next STT timer set is due on Tuesday,18-APR. 8.3 Terminators We are doing offpoints on each terminator opportunity. Please consult with the SXT chief observer for how this works, and refer to examples in the OPs from Week 12 for guidance in how to schedule the images. We are using the following offpoint OG's and are going through them in sequence cyclically. That is, change each time to the next number please: OG 34 S/C W17 N00 (all OG numbers are decimal) OG 35 S/C W10 S01 OG 36 S/C W04 N00 OG 85 S/C W03 N02 OG 86 S/C E04 N00 <------ next Do not use OG 33 and 87 until we clarify the safety issue.