July 23, 1999 
                                                   B. Handy, H. Hudson 
 
                   CHIEF OBSERVER'S REPORT for Week 30
                        12-Jun-99 to 18-Jul-99

GENERAL

Activity is up again this week from last week's doldrums, with Active
Region #8636 coming around the limb and yielding several high C- to mid
M-class flares.  SXT performed a CCD bake-out this week.


SXT TECHNICAL 

A CCD bakeout scheduled for 22-23 July went off relatively smoothly.
The data has not yet been analyzed in detail; however it appears that
SXT spent a large amount of time in flare mode -- on Friday, four of
the five KSC passes had SXT in flare mode!  SXT responded to several
flares during the bake; one occurred twice off the SE limb, several 
from AR 8636, and one anomalous mis-point to somewhere off the NW
limb.  This mis-point doesn't appear to have led to any obvious CCD
damage, but the CCD experts will have to look into this in more
detail.


SXT SCIENCE

For Web material see

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/SXTweekly.html
Current Week: http://isass1.solar.isas.ac.jp/sxt_co/990723.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

CAMPAIGNS

For more information on campaigns, see:

http://sec.noaa.gov/solcoord/solcoord.html

For SXT plans, see:

http://isass1.solar.isas.ac.jp/sxt_co/sxt_future.html

PERSONNEL

There were no changes during the reporting period.

SEMINARS

There were no seminars this week.

                       SXT TABLE PLAN, WEEK 31
                        (26-Jul-99 to 01-Aug)

No collaborations are planned during the coming week.  

________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Monday		25-Jul-99 21:08    2     *990726 P2 ARS1 STANDARD
Tuesday		26-Jul-99 21:22    2     *990727 P2 ARS1 DARK
Wednesday	27-Jul-99 23:20    3     *990728 P3 ARS1 DIFFUSER
Thursday	28-Jul-99 21:51    3     *990729 P3 ARS1 STANDARD
Friday		29-Jul-99 22:06    3     *990730 P3 ARS1 STANDARD
Saturday	30-Jul-99 18:55    2     *990731 P2 ARS1 STANDARD

The (*) in a table name means that the UT date and the JST date 
don't match.

This plan is subject to change.

Continuing requests:

KSC & SSOC Tohbans: If any KSC passes are likely to be cancelled (for
example due to a typhoon) or an SXT table cannot be uploaded for some
reason, please telephone and e-mail the Chief Observer immediately.
(sxt_co@isass0.solar.isas.ac.jp, copy to sxt_st@flare2.solar.isas.ac.jp).

SSOC Tohban: On the weekly visible diagram, please mark the official
five passes first and then cross out those passes that will be given to
other satellites.  That way we can keep the numbering straight in the
Yohkoh software system.

SSOC Tohban: SXT operations do not currently include terminator off-
pointing. It is unnecessary this week to ask the SXT Chief Observer
for terminator off-pointing information.

KSC Tohbans: In general flare mode supersedes table upload, i.e. if a
flare is in progress please do not upload a new table, and contact the
chief observer. Normally it is OK to go ahead with the planned table
without change on the next pass, if it is available. Chief observers
should keep an eye on this.