SXT REPORT FOR WEEK ONE 
                         28 Dec. 1993 - 4 Jan. 1994              
                                                           4 January 1994
                                                              Hugh Hudson


GENERAL STATUS
     
     Normal operations at KSC resumed after the long New Year's holiday,
and both SXT and the Yohkoh spacecraft returned to service working well. 
The solar activity had remained at a high level during the holiday, with
an M6 flare occurring on Jan. 2.

PERSONNEL

     There were no changes of personnel and no new visitors over the
holidays. Greg Slater is expected on the 5th. Hudson will leave on the
6th to go to the AAS meeting (late poster on the transit of Mercury and
the eclipse of November).

SOLAR ACTIVITY

     The activity level remained high over the holidays, with AR7645 picking
up where AR7640 had left off. The major M flare at about 23:00 2-Jan had
an LDE tail with three hours above the C level (peak emission measure
about 10^49 cm^-3). For a change, the Yohkoh observations were perfectly
timed - no SAA, no night. However, it may be that the sparse data
coverage over the holiday (no commanding operations) kept Yohkoh from
recording the data properly. At the time of writing there were two large
active regions at disk center, AR 7645 and AR 7646. Both showed
appreciable shear in the Mees magnetograms, and trans-equatorial loops
were extensively connecting them in the now-classic quadrupolar
configuration for AR's at the same longitude.

SCIENCE PROGRESS  

     These were holidays so not many people were around. Nariaki Nitta,
though, abandoned his holiday completely and stayed loyally at ISAS,
working especially with flare observations from AR 7260 (the Hawaii
data-analysis workshop region). He is especially looking at the
magnetic connectivity, as defined by SXT, before and during the
flares.  Another notable activity at ISAS over the holiday was work by
Jun Sato (Rikkyo University Master's student) on HXS spectral fitting.
His software may be the best available for this task, and we hope it
can get into the Yohkoh analysis software soon. Hudson finished his
Kofu poster paper (co-authored with Van Driel and Kosugi), concluding
that the mm-wave and X-ray data require that the gradual white-light
flare continuum must come from coronal loop inclusions at photospheric
densities. Hudson also wrote a few-page review of the SXT coronal
observations for internal purposes. As a part of this he began software
to help coordinate Ulysses and Yohkoh observations - the sub-satellite
point of Ulysses on the solar disk is now swinging across the S polar
region.

SXT OPERATIONS 

     SXT operations returned to normal. A bakeout will probably be
deferred because of the high activity. We won't see our treasure
trove of flare data collected over the holiday until Sirius and the
reformatter get untracked - this means that the ISAS mainframe
computers need to be fired up and brought on stream, a process
requiring many hours' work by people wearing neckties.
     Nariaki Nitta will take over as SXT Chief Observer this week.  
     No special campaign observations were scheduled this week or next.