REPORT FROM ISAS    10/03/91    L. Acton

This morning dawned bright and clear, the finest weather we've had
in 6 weeks.  It lasted nearly 3 hours.

Today the SXT thermo-electric cooler (TEC) was switched on and very
quickly cooled down to -20.995 C and went into regulation as far as
we can tell from the data seen so far.  Hurrah, JPL!  Another good
camera success.

Today I've been working with ratios of quarter resolution images through
all of the analysis filters to test our ability to measure temperature.
Basically the ratios are as expected but it is tough to beat down the
noise in image ratios.  It should be a great help to have the CCD
cooled.

A major breakthrough today was to get an orbital prediction file created
in the Facom mainframe and transferred to our workstations.  Mons has
already written software to read it.  This becomes fodder for the
reformatting mill and is a major step towards improvements in command
generation software a bit later.  Thanks to Hugh, Jim and Nariaki a lot
has been learned today about file transfer between the Facoms and our
net.  It is to be hoped that eventually we will be able to markedly
improve the human interface to the Yohkoh command generation system.

In the morning we are having a meeting with Saku, Yoshi and Yutaka
Uchida to discuss practical operational issues.  On October 8 Watanabe
san has announced a meeting on YOHKOH operations and a party.

I believe that now everything on SXT has been tested and put into
operation.  It only remains to do a photon transfer gain calibration but
I can tell from the values of DN for single pixel full well that there
will not be any big surprises there.

Loren Acton