SXT Status Report 
                     07 November - 13 November, 1994
   			    Marilyn Bruner   

SUMMARY

	This week was relatively quiet.  We resumed the systematic
program to accumulate terminator images at various spacecraft offpoint
values.  The SXT observations went smoothly, though Acton discovered a
small amount of CCD damage that resulted from the anomalous operation of
the SXT instrument that was reported late last week.  The sun remained very
quiet throughout the period, and there were no special observing campaigns. 
	
OPERATIONS

	This week's operation went very well.  The terminator observing
campaign was successfully resumed with the able assistance of SSOC
Tohbans Kano san and Yasuno san and KSC Tohbans Akioka san and Fujiwara
san.  Bruner used a new program written by Lemen san to search the data
archives for terminator images, finding that 19 out of the 40 originally
planned offpointed terminator images had been done.  An additional six
were completed this week, assuming that those scheduled for DSN passes
are successful.  Two more that are needed to complete the SPARTAN
support archive are scheduled to be done early next week.  A priority
list for scheduling the remainder has been prepared and is in use in the
SSOC. 

	H.  Hara has completed a comprehensive study of the anomalies
observed on November 3rd and reported last week.  His analysis shows
that the SXT unexpectedly entered the Frame Transfer Mode prior to being
stopped by the DP becauses of error flags.  As a result, the SXT shutter
was left open for a period of about 25 minutes, before the system
corrected itself.  This, coupled with some long exposures that were part
of the SXT observing table resulted in a substantial amount of
unexpected irradiation of the CCD by X-rays.  Acton has compared the
diffuser images following the anomaly with similar images taken earler
this year, concluding that there is a small, but noticable change due to
radiation damage.  The damage is not large enough to affect the quality
of SXT operations, though correction will be necessary for precice
photometry.  It will probably become less prominent with time due to
annealing, as we have seen in the past.  Hara san's report is now
available, though it has not yet been distribted. 

SOLAR ACTIVITY

	Solar activity continued at a very low level throughout the week,
slowly decreasing from B1 to around A4 during the course of the week. 
There were several B-class flares and two or three C-class flares during
the period.  Active region 7794, which produced most of the activity
last week, has rotated beyond the West limb.  Several regions of modest
brightness have appeared in the East; most are magnetically simple, and
do not appear to have a high potential for flare activity.

PERSONNEL

	Marilyn Bruner continues to serve as SXT Chief Observer.  Hugh
Hudson, and Nariaki Nitta constitute the remainder of the regular SXT
observing team.  K.D. Leka arrived, following the victorious defense of
her PhD Thesis.  She will work on comparisons of SXT images with some of
the data from Mees observations.  Zdenek Svestka continues his work on
The SXT observations of giant arches.

SCIENCE

	The ISAS seminar this week featured M. Yamauchi (Kiruna) who
discussed magnetospheric observations and the fascinating relationship
between the substorm and flare phenomena.  His point of view
de-emphasizes the role of reconnection in the major energetic processes
of substorms, which of course conflicts with the majority view of the
solar processes so beautifully observed with Yohkoh.  There was the
usual spirited discussion led by Shibata-san. 

	SXT images of the 1994 Nov 3 solar eclipse were included in a
display of exciting new data recorded by the Japanese expedition to
Chile (E. Hiei, K. Ichimoto).  The display was part of a very
interesting exhibit of current astronomical research, prepared for the
annual NOAJ open-house that was held on Saturday, Nov 12th.  The
ground-based observations included an excellent image of the white-light
corona at the time of totality, and a number of first-rate prominence
spectra, showing the H and K lines of Ca II in emission.  According to
T.  Hirayama, this is a very rare observation. 

	Keith Strong met with Joe Davila and Lika Guhathakurta about
past and future coordinated observations.  The SERTS team has now done
an extensive and very careful analysis of the exact locations on the Sun
of the two spectroheliogram (overlap-o-gram) fields of view and the
narrow spectrograph slit.  These have been compared with ground-based
magnetograms, sunspots, etc.  They are now ready to be compared with the
equivalent fluxes from the various SXT filters.  This will go ahead if
the SERTS team is funded to support this work under the upcoming GI
program; otherwise progress will be slow. 

	The SPARTAN team has just received the flight tapes from the
Shuttle, and have not yet had a chance to analyze them.  Strong has
started a survey of the SXT data taken during the SPARTAN campaign. 
Images taken with the DAG filter appear to be very good; those made with
the Al1 filter are substantially affected by scattered light, and will
need to be corrected with the results of the terminator offpoint
observations before they can be used.  The coronal rays seem much
fainter this time than they were in April 1993 - Strong will check that
quantitatively once the images have been cleaned up a bit better.  We
seem to have caught another CME on the west limb. 

PLANS

	Next week's operation is expected to be very similar to this
week's activities.  We will continue the background program to acquire
terminator images at the various defined offpoints.  An additional
offpoint location, N-W (4') has been added to the original list and will
be observed with of the filters in turn.