8 January 1998 Hugh Hudson SXT CHIEF OBSERVER'S REPORT AND TABLE PLAN CHIEF OBSERVER'S REPORT for Week 2 4-Jan-98 to 13-Jan-98 SOLAR ACTIVITY Solar activity has dropped significantly this week, with only one C-class flare (Jan. 5) in the interval. SXT INSTRUMENT STATUS SXT continues to function well. The CO made a mistake on Friday and there were some unflushed Be long exposures in the PFI's. The alert KSC tohban noticed this immediately on Saturday morning and we fixed the problem. SXT WEEKLY SUMMARY ON THE WEB As we did last year, we are putting weekly "science nuggets" on the Web, with a link to this page for table-plan details. This week's nugget deals with the rather linear (semilog) decay of solar X-ray flux over the first week of 1998 observations. Kind of interesting, actually. See ftp://isass0.solar.isas.ac.jp/pub/sxt_co/SXTweekly.html and the following page contains a list of all nuggets thus far: ftp://isass0.solar.isas.ac.jp/pub/sxt_co/index.html. For some of last year's interesting items, not necessarily what is reported in the nuggets but emphasizing real research instead, see: ftp://isass0.solar.isas.ac.jp/pub/yohkoh_in_1997/1997.html CAMPAIGNS There were no official campaigns conducted this week. SEMINARS There were no seminars this week. A new series of ISAS/Yohkoh seminars will begin this month. SXT TABLE PLAN FOR WEEK 3 (13-jan-98 to 20-jan-98) SXT Chief Observer: Hudson ________________________________#_______________________________ JST Day UT Start Time Pass Table ID Friday 9-JAN-98 01:12 2 980108 P2 ARS1 STD+LONG Saturday 10-JAN-98 01:30 2 980109 P2 ARS1 STD Monday 12-JAN-98 00:24 2 980111 P2 ARS1 STD Tuesday 13-JAN-98 04:08 2 980112 P4 ARS1 DARKCAL Wednesday 13-JAN-98 23:17 3 980113 P2 ARS1 STD+DIF Thursday 15-JAN-98 01:18 3 980114 P3 ARS1 STD Friday 15-JAN-98 23:53 2 980115 P2 ARS1 STD Note that this plan is subject to change. Note also that the table names don't match very well because we are rotating past 0h UT - our convention is to name the table based on the UT of pass 1 on that day. Continuing requests: SSOC Tohban: On the weekly visible diagram, please mark the official 5 passes first and then cross out those passes that will be given to other satellites. That way we can keep the numbering straight in the Yohkoh software system. SSOC Tohban: SXT operations do not currently include terminator off- pointing. It is unnecessary this week to ask the SXT Chief Observer for terminator off-pointing information. KSC & SSOC Tohbans: If any KSC passes are likely to be cancelled (for example due to a typhoon) or an SXT table cannot be uploaded for some reason, please telephone and e-mail the Chief Observer immediately.