16 January 1999 David McKenzie Hugh Hudson SXT CHIEF OBSERVER'S REPORT AND TABLE PLAN CHIEF OBSERVER'S REPORT for Week 03 11-Jan-99 to 17-Jan-99 GENERAL SXT continues to perform properly. Solar activity increased during the week. The X-ray background at the end of the week was near the GOES C level. Three M flares have been observed as of the time of this writing. SXT TECHNICAL The SXT instrument is functioning nominally, no serious problems to report. Some false flare triggers occurred on 13-jan. These are all attributable to either (a) enhanced levels of energetic particles over the middle Pacific or (b) South Atlantic Anomaly. SXT SCIENCE For Web material see Current Week: http://www.solar.isas.ac.jp/sxt_co/SXTweekly.html Current Week: http://www.solar.isas.ac.jp/sxt_co/990115.html Index: http://www.solar.isas.ac.jp/sxt_co/index.html This week's Nugget describes an apparent eruption just south of disk center on 11-jan. CAMPAIGNS There were no formal joint observing campaigns, though we made some fixed-pointing PFIs to support TRACE observations. SOHO is temporarily offline again. See the general coordination page at: http://sec.noaa.gov/solcoord/solcoord.html PERSONNEL No personnel changes this week. SEMINARS There was no seminar this week. DRAFT SXT TABLE PLAN, WEEK 04 (18-Jan-99 to 24-Jan-99) No coordinated observations are currently planned, but we will watch the TRACE plans carefully and try to support their observations if we can. ________________________________#_______________________________ JST Day UT Start Time Pass Table ID Tuesday morn. 18-JAN-99 16:26 2 990118 P2 ARS1 STD Tuesday night 19-JAN-99 14:59 2 990119 P2 ARS1 DARKCAL Thursday morn. 20-JAN-99 15:15 2 990120 P2 ARS1 STD Thursday night 21-JAN-99 12:07 1 990121 P1 ARS1 DIFF Friday morn. 21-JAN-99 17:15 4 990121 P4 ARS1 STD Friday night 22-JAN-99 14:05 2 990122 P2 ARS1 STD Saturday night 23-JAN-99 12:38 2 990123 P2 ARS1 STD Continuing requests: 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. (sxt_co@isass0.solar.isas.ac.jp, copy to sxt_st@flare2.solar.isas.ac.jp). SSOC Tohban: On the weekly visible diagram, please mark the official five 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 Tohbans: In general flare mode supersedes table upload, ie if a flare is in progress please do not upload a new table, and contact the chief observer. Normally it is OK to go ahead with the planned table without change on the next pass, if it is available. Chief observers should keep an eye on this.