SXT Status Report 
                   20 November - 27 November, 1994

                          Marilyn Bruner   
                            Hugh Hudson


SOLAR ACTIVITY

The solar activity remained at a low level, although there is a mild surge 
upwards (two C flares) at the time of writing. Interesting SXT images were
obtained even though during part of the week there was an absence even of many
tiny (spotless) active regions, as we have often seen before; but nevertheless,
there were many coronal structures in the images.
	
OPERATIONS

The program to accumulate terminator images proceeded, via the kind offices 
of SSOC tohbans Shibasaki and Leka. A successful test of the SXT HALT command
was  performed, although through a misunderstanding it was scheduled at a time
when Hara_san was not standing by to monitor it. We now have the ability to
turn SXT off independently of other Yohkoh operations. We never intend to have
to do this, but it would have been useful at least once in the past. The
provisional plan is to reserve the use of this command to interventions by the
super-tohban or other very knowledgable SXT person, rather than to have it in
the hands of the KSC tohbans.
  There were 7 DSN conflicts in the strawman schedule (+4 weeks) negotiated
with ASCA. The number is gradually increasing, and we will renew the quest for
access to the Wallops antenna. 
  Diagnostic work on the November 3 errors continues.

PERSONNEL

Marilyn Bruner served as SXT Chief Observer until her departure on
Saturday.  Hugh Hudson wil bridge the gap until Loren Acton (arrived
Monday) takes over. Steve Kahler returned to ISAS, to stay for a few
days; K.D. Leka remains as the other foreign visitor. K.D. may be the
first Ph.D. student from a university outside Japan to finish a thesis
making use of Yohkoh data.
  This week's Yohkoh tohbans were Shibasaki and Leka at SSOC, with Hori
and Hanaoka at KSC.

SCIENCE

The Yohkoh seminar this week again happened as a caboose to the weekly
operations meeting on Monday, due to schedule conflicts and the fact that we
had no alternative if we wanted to hear K.D. Leka report on her thesis research.
  Bruner and Hudson worked on incorporating the newly available terminator
images into the offpointed observations from the Spartan joint observing
campaign. This was fairly (even surprisingly) successful, though the
clerical work of making routine use of the terminators has not yet been
completed. This has been a major operational program, aided and abetted by many
chief observers and tohbans over the past few months. The Japanese eclipse
expeditions (Ichimoto and Hiei) returned with some splendid data, and we have a
little more confidence in our ability to deal with stray light for the long
exposures obtained during the eclipse. Furthermore, the derivation of reliable
synoptic temperatures looks more promising now, and this will have
repercussions on Yohkoh's ability to contribute to the interesting coronal
studies obtained during the recent Sac Peak campaign.
 
PLANS

Next week's operation is expected to be very similar to this week's activities.
We still have a lot of terminator work to do. If the current active region is a
flash in the pan (as is entirely likely these days) we will try to observe
filaments and filament channels better. As usual, updates to this kind of
planning will be found in finger campaign@133.74.8.100.