7 December 1998
                                                                Mark Weber 
 <P>               SXT CHIEF OBSERVER'S REPORT AND TABLE PLAN <P>
                  CHIEF OBSERVER'S REPORT for Week 50
                         7-Dec-98 to 13-Dec-98 <P> GENERAL <P>
 Yohkoh and SXT continued to perform without problems this week. Solar
 activity was noticeably (but not greatly) higher than the previous week,
 with several LDEs in the low- to mid-C range. The GOES background also
 rallied to C1 level by the middle of the week. There were no (0) 
 M-class flares.    <P> SXT TECHNICAL <P>
 The SXT instrument is functioning nominally. <P> SXT SCIENCE <P>
 For Web material see <P>
 <P><PRE>Current Week: <A HREF="http://www.solar.isas.ac.jp/sxt_co/SXTweekly.html"><B>http://www.solar.isas.ac.jp/sxt_co/SXTweekly.html</B></A>
 Current Week: <A HREF="http://www.solar.isas.ac.jp/sxt_co/981211.html"><B>http://www.solar.isas.ac.jp/sxt_co/981213.html</B></A>
 Index:        <A HREF="http://www.solar.isas.ac.jp/sxt_co/index.html"><B>http://www.solar.isas.ac.jp/sxt_co/index.html</B></A>
 </PRE> This week's Science Nugget looks at a high latitude large arcade which
 runs north-south. <P> CAMPAIGNS <P>
 There were no formal joint observing campaigns this week. The TRACE
 planner responded to a query from the SXT CO-- they will start sending
 emails of their observing schedule once again. SXT was able to follow
 AR 8406 in conjunction with TRACE and the VLA for a few hours of flare
 study on Friday. <P>   PERSONNEL <P> Nothing to report. <P> SEMINARS <P>
 The seminars this week were given by K. Shibasaki, on the role of 
 ballooning instabilities in filament evolution, and by S. Kubo, on the
 solar rotation. Discussion was lively! <P> <HR> <P>
                                                     11 December 1998
                                                             M. Weber <P>
                        SXT TABLE PLAN, WEEK 51
                       (14-Dec-98 --- 20-Dec-98) <P>
 We know of no particular plans for coordinated observations, but will
 keep our eyes on TRACE and CDS as usual. TRACE has promised to start
 sending their operation plans again. <P> <HR> <P>
 <H5>JST Day         UT Start Time      Pass    Table ID</H5> <P>
 <P><PRE>Monday          14-DEC-98 10:03    3      981214 P3 ARS1 DARKCAL
 Tuesday         15-DEC-98 10:20    3      981215 P3 ARS1 STD
 Wednesday       16-DEC-98 08:53    3      981216 P3 ARS1 STD+DIFF
    "            16-DEC-98 12:20    5      981216 P5 ARS1 STD
 Thursday        17-DEC-98 10:53    4      981217 P4 ARS1 STD
 Friday                  *** Yohkoh Holiday ***
 Saturday        19-DEC-98 07:59    3      981219 P3 ARS1 STD </PRE>
 Continuing requests: <P>
 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). <P>
 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. <P>
 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. <P>
 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. <P>