24 October 1998
                                                           David Mckenzie
                                                              Hugh Hudson

              SXT CHIEF OBSERVER'S REPORT AND TABLE PLAN

                 CHIEF OBSERVER'S REPORT for Week 43
                       19-Oct-98 to 24-Oct-98

GENERAL

Yohkoh and SXT have performed well this week, despite continuing computer
hiccups at the ground support station at Kagoshima. Solar activity was
moderate, with a number of C flares.

SXT TECHNICAL

We will probably request a normal pointing update early this week.
We intend to do a bakeout soon, probably next week.

All of the SXT observer types will be up at Nobeyama. We intend to leave
two tables on line Monday evening, and to request the KSC tohbans to 
transfer them according to the plan. We will be accessible at

   Tel: 0551-48-2111 (+81-551-48-2111) (Hotel Seisenryo)
   Fax: 0551-48-2099 (+81-551-48-2099) 

and will be logging on from a nearby radio observatory as need be.

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/981023.html
Index:        http://www.solar.isas.ac.jp/sxt_co/index.html

This week brings the anniversary of the "Science Nuggets" webpage:
one full year of Nuggets.  The topic is a sigmoid-shaped active region
that produced a halo CME, very similar to the very first Science Nugget
of 24-Oct-97.

CAMPAIGNS

There were no formal campaigns this week.  We stared at a target region
in the northeast, to support TRACE's hopes of seeing an emerging flux
region.

PERSONNEL

No changes.

SEMINARS

The seminar this week was given by T. Yoshida, who described the use
of multiple analysis filters to determine the differential emission 
measure of plasma observed by SXT.  Solution for the DEM in this way 
yields a somewhat different estimate of the plasma conditions than the 
standard filter ratio method.


                        TABLE PLAN, WEEK 44
                      (26-Oct-98 -- 31-Oct-98)


We look forward to synchronizing again with SOHO. There seem to be no
coordinated observations planned yet for this week.

_______________________________#_______________________________

JST Day          UT Start Time    Pass      Table ID

Monday          26-Oct-98 08:09    2      981026 P2 ARS1 STD 
Tuesday         27-Oct-98 08:26    2      981027 P2 ARS1 DARKCAL
Wednesday       28-Oct-98 07:00    2      981028 P2 ARS1 DIFF
Thursday        29-Oct-98 05:35    1      981029 P1 ARS1 STD
Friday          30-Oct-98 05:51    2      981030 P2 ARS1 STD
Saturday        31-Oct-98 06:08    2      981031 P2 ARS1 STD

This plan may change during the week.

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.