CHIEF OBSERVER'S REPORT for Week 29
                      16-Jul-01 through 22-Jul-01 

                               A. Takeda

GENERAL 

The solar activity was moderate during the week. Major flares were brought 
by ARs 9537 and 9539; each produced an M-class flare. Unfortunately, their
observations with Yohkoh were blocked by S/C nights and SAA passages.  


SXT TECHNICAL 

No new problem to report.  SXT normal pointing was updated on 21-Jul., at 
pass number 010721-0619. 

SXT SCIENTIFIC
 
For Web material see the science nuggets:
 
Current Week: http://isass1.solar.isas.ac.jp/sxt_co/010720.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html
 
In this week's Nugget, a team of image providers (Bastian, McKenzie,
and Nitta) fed a ghost writer (Hudson) with non-coronagraphic images
of 3-part structure in CMEs. There seems to be something fundamental
in this morphology.

CAMPAIGNS 

Through the week, we cooperated with the CDS (VelAR) campaign to study 
Inter-Connecting Loops between active regions. An active-region pair, 
9537/9539 was our main target, for which there were some good ICLs.
These regions caused eruptions a few times. We also supported JOP 100 
for two runs scheduled on the 17th and 19th.

For SXT plans, see:
http://isass1.solar.isas.ac.jp/sxt_co/sxt_future.html

For SXT completed campaigns, see:
http://isass1.solar.isas.ac.jp/sxt_co/sxt_catalog.html


PERSONNEL

Hudson arrived.

SEMINARS

There was no seminar this week.



                     SXT TABLE PLAN, WEEK 30
                   (23-Jul-01 through 29-Jul-01)

The last run of the JOP 100 campaign is scheduled on Monday. 
No other campaign is planned for this week.  There will be two table 
uploads on Tuesday afternoon. 

We plan to carry out a one-day bakeout of the SXT CCD on Thursday.
Detailed instructions will be given to the tohbans later in the week.

_______________________________________________________________

JST Day         UT Start Time      Pass        Table ID

Monday PM       23-Jul-01 07:47      3    010723 P3 ARS2 STD+J100  
Tuesday PM      24-Jul-01 04:24      1    010724 P1 ARS1 DIFF 
Tuesday PM      24-Jul-01 07:46      3    010724 P4 ARS1 STD
Wednesday PM    25-Jul-01 07:45      3    010725 P3 ARS1 DARK
Thursday PM     26-Jul-01 04:22      1    010726 P1 ARS1 BAKE
Friday PM       27-Jul-01 04:21      2    010727 P2 ARS1 STD
Saturday PM     28-Jul-01 04:21      2    010728 P2 ARS1 STD 

This table plan is likely to change.  Prepare for last minute changes.

Continuing requests:

KSC & SSOC Tohbans: If any KSC passes are likely to be cancelled (for
example due to typhoons) or an SXT table cannot be uploaded for any 
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).

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.

                 BAKEOUT COMMAND PLAN, July 26-27 2001
 
Thursday PM pass 1   04:21 UT   Load bakeout table "010726 P1 ARS1 BAKE"
            pass 2   06:02      TEC off
            pass 3   07:44      heater on
 
Fsriday    AM pass 1  02:40 UT   heater off
           PM pass 2  04:20      TEC on
              pass 3  06:01      load SXT table "010727 P3 ARS1 STD"           

Comments:

The temperature of the CCD is read at each image exposure. It should
change rapidly when the TEC and heater commands are issued, and can be
monitored via the real-time displays at KSC. The CO will work with the
reformatted data and confirm that things are OK, and perhaps write a
Yohkoh science nugget on what it all means.