SXT Status Report 
                      16-28 Jan 1995  (Weeks 3 & 4)
                               ---------
                           
			     James R. Lemen
	                       31-Jan-1995


SUMMARY

     Perhaps the biggest item to report for the past two weeks,
especially from the perspective of someone in Japan, is the devastating
earthquake that struck Kobe city and the surrounding area.  As most of
you probably know, the damage to Kobe City was extensive and there were
over 5,100 deaths.  Because of the shallow epicenter, the extent of the
quake was fairly localized.  We in the Tokyo region did not feel this
earthquake and there has been no effect on Yohkoh operations. 


SOLAR ACTIVITY

     The solar activity began to rise during the week of 16 January
(reaching up to about low B-level).  There were a few C-class events
occurring during the end of the week.  SXT conducted a filament watch
campaign for three days on two filaments, one in the northern hemisphere
and one in the south.  This campaign was conducted in coordination with
Mees Observatory, with filament targets being suggested by Kevin
Reardon, who was the Mees duty scientist at the time.  Although we did
observe an eruption, it was a very good exercise to include the SOON
site observatories to track a specific target.  The SOON site
coordination is handled by Alan Kiplinger.  We will try to repeat this
campaign when the solar conditions are again appropriate. 

     Last week there were two active regions (AR 7829 and 7830) that
formed at approximately the same longitude, but on either side of the
magnetic equator.  We decided to try to observe each active region using
ARS2 tracking mode and we also arranged for fixed, long exposures to be
taken at the area between the two active regions (using ART tracking). 
The objective for this observing sequence was to try to measure the
signature of inter-region reconnection loops. 


OPERATIONS

     SXT had an error last week, probably caused by an SEU, that had to
be manually recovered the KSC tohbans.  The error ID was SHUTTR, but
the real fault was probably an SEU from which the SXT micro could not 
successfully recover.  The error occurred at approximately the time
of an SAA passage.  The normal recovery procedure was executed during
the next two passes.  The odometer reading on the SXT filter indicates
that it had been about three months since a similiar SEU event occurred.


SCIENCE

     We enjoyed a very nice seminar day last week.  There were two talks
with people having similar surnames.  Louise Harra gave a talk entitled
"Spectroscopic Observations of Loop Tops" in which she reported on the
work that has been done on four flares seen by Yohkoh at and just over
the west limb.  Hirohisa Hara gave interesting talk entitled "High-Lati-
tude Activity and the Migration towards the Equator Associated with the
Solar Cycle." It is interesting to see how long-term SXT observations
are becoming useful for testing various solar dynamo models.  Hara san
will be working hard over the next two months to complete his Ph.D. 
thesis. 


PERSONNEL

     Two weeks ago Dick Canfield arrived from sunny Hawaii to begin
month long visit.  Dick spent last week completely absorbed in SSOC
Tohban duties.  Shortly after Dick's arrival Nariaki Nitta departed to
Calif.  after spending a month at ISAS.  Louise Harra-Murnion and her
husband, Shane, left Japan last year after spending 15 months as a part
ISAS-BCS team.  Louise is taking a position with George Simnett at
Birmingham University.  Her cheerful disposition will be missed.  We
enjoyed a nice party at a robatayaki (Japanese barbecue) restaurant in
honor of the Murnions' departure.  Finally, Bob Bentley arrived last
weekend to help supplement the BCS team. 

Tohbans for Week 3
   SSOC: H. Miyazaki, and A. Sterling
   KSC:  Y. Nakagawa, and A. Okubo
Tohbans for Week 4
   SSOC: S. Tsuneta, and R. C. Canfield
   KSC:  A. Okubo, and T. Yoshida
SXT Chief Observer:
   J. R. Lemen
SXT Systems and Data Engineer:
   G. L. Slater