SXT Status Report
                      12 May 1997 to 2 June 1997
                            (Weeks 20-22)
                     S. Savy, H. Hudson, M. Weber


SUMMARY

SXT continued to operate well. Solar activity was moderate.

SOLAR ACTIVITY

An M flare and half a dozen C flares occurred. The GOES background level
ranged above B for days at a time, so this was one of the more active
intervals we have experienced recently. Rumor has it that the M flare of
May 21 (remember SMM?) produced yet another Moreton wave in the SOHO/EIT
observations.

SXT INSTRUMENT STATUS

SXT continues to perform well technically. 

SXT CALIBRATION ACTIVITIES

A second UV flood experiment was done in a continuing effort to understand
the "dark pixel" phenomenon. Otherwise, no particular concerns arose. A
normal point adjustment was carried out on May 14 to help make a better
concentration of the thin Al terminator images. 

PASS CONFLICTS

Week 20: Six passes were cancelled for Akebono.
Week 21: Eight passes were canceled (five for Akebono, three for Haruka). 
Week 22: Eleven passes were canceled (nine for Haruka, two for Akebono).

CAMPAIGNS

A major series of joint observations took place at the end of May. These 
were coordinated from the SOHO center in Paris (MEDOC) by Brigitte
Schmieder. SXT also observed, but with no special setup, during the EUV
rocket flight of Woods and Hassler. We continue trying to follow SOHO
planning, especially CDS targets.

For Yohkoh target planning, the SXT weekly observing plan is available on
the Web at
        http://www.space.lockheed.com/SXT/html2/First_Light.html
or with
        "finger campaign@isass0.solar.isas.ac.jp | more"        .

See http://sohowww.nascom.nasa.gov/operations/targets/today"
for SoHO target planning.

VISITORS AND PERSONNEL

Hugh Hudson was absent for almost two weeks for AGU. Mark Weber
arrived, as did Lee McDonald from the BCS group at MSSL. Len Culhane
was also absent for a week in the U.K.; Joe Khan and Serge Savy returned
from the filament meeting at Aussois. Greg Slater returned in time for
the rainy season.

SEMINARS

There was a Yohkoh seminar on May 14:

H. Hudson (SPRC ) "Coronal Mass Ejections, part I"
J. Khan (MSSL) "Filamentary Impressions of France"

Hudson is doing a tutorial on CMEs that will go on whenever there
is room in the seminar schedule. We're all quite amazed at how much
wonderful observational material there is on CMEs during solar minimum.

TOHBANS

Tohbans for Week 20:

    SSOC :  Hara, Shinohara
    KSC  :  Okubo, Hashizume
    SXT_CO: H. Hudson
    SXT_SW: -

Tohbans for Week 21:

    SSOC :  Koide, Sterling
    KSC  :  Morita, Okubo
    SXT_CO: S. Savy
    SXT_SW: -

Tohbans for Week 22:

    SSOC :  K. Marubashi, (S. Watari 6,7), Y. Kato
    KSC  :  S. Kawashima, S. Morita
    SXT_CO: M. Weber
    SXT_SW: G. Slater