REPORT FROM ISAS   21-NOV-1991
L. Acton

We now have a fax machine in the Yohkoh analysis lab in ISAS building D. 
The telephone number is

	0427 69 4532

>From foreign countries the number will be

	81 427 69 4532

The U.S. SXT team greatly appreciates this new convenience provided by
ISAS for the benefit of the Yohkoh mission and the advance of solar
physics.  We look forward to hearing from you.

Valuable solar data continues to flow in from Kagoshima Space Center and
the NASA Deep Space Network.  It is really great that we have the DSN
coverage, especially for SXT.  One of the latest exciting results is
excellent coverage of the X flare of 15 November at around 2230 UT.  At
last we have a flare that shows some action!  And a nice moving white
light event for icing on the cake. 

We have increased the longest full disk exposure to 15 sec from 2.7 sec
in our standard sequence table.  The 3 exposures are now 0.0783 sec,
2.668 sec and 15.108 sec.  The same sequence of 3 exposures is run for
the Thin Aluminum and Dagwood Sandwich filters, providing a temperature
diagnostic from 1 10 MK.  The most recent composite image I constructed
from these three exposures had an intensity range of over 3E5, tough to
display properly on an 8 bit color monitor!

A very successful calibration run was taken on 19 November.  Careful
examination of 4 minute dark exposures reveal latent images of recent
x-ray features but no general change that might reveal the onset of
x-ray damage.  Exposures were made through the aspect telescope in all
filter modes including open-open but these data are not yet analyzed. 

I understand that the SXT image published in the 8 November issue of
SCIENCE turned out quite nicely.  We'll all be interested to see it as
the data were transferred electronically and the magazine people
produced the print.