CHIEF OBSERVER'S REPORT for Week 20
                      14-May-01 through 20-May-01 

                               A. Takeda

GENERAL 

Solar activity was moderate throuth the week. Main source of the activity
was AR 9455, which produced three M1-class flares. SXT underwent 3 runs of
flare mode, which included an M1.2 event in AR 9455 on the 17th. The data
coverage for this event is pretty good, although we couldn't detect any
clear associated waves.

SXT TECHNICAL 

No new problems.

SXT SCIENTIFIC

For Web material see the science nuggets:

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/010518.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

This week's science nugget picks up a technical topic after a while.
It reviews the image buffer system adopted for SXT, and introduces how
cleverly they are managed to create an uninterrupted flow of the telemetry.

CAMPAIGNS 

We coopreted with MEDOC campaign, which consists of some independant JOPs. 
For this week, we supported JOP131/107 lead by B. Schmieder and mainly 
observed a filament/prominence having approached toward the SW-limb. 

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

N. Nitta arrived on 20th.

SEMINARS

No seminar for this week.


                     SXT TABLE PLAN, WEEK 21
                   (21-May-01 through 27-May-01)

We continue to support MEDOC campaign No. 7, but the emphasis is
shifted to observing active regions that are likely to produce
CMEs.
_______________________________________________________________

JST Day         UT Start Time      Pass   Table ID

Monday PM       21-MAY-01 11:12      1    010521 P1 ARS2 DRK W
Tuesday AM      21-MAY-01 16:15	     4    010521 P4 ARS1 STD W*
Tuesday PM      22-MAY-01 11:11      1    010522 P1 ARS2 DIF W
Wednesday AM    22-MAY-01 16:16      4    010522 P4 ARS1 STD W*
Wednesday PM    23-MAY-01 11:11      1    010523 P1 ARS2 MEDOC 
Thursday AM     23-MAY-01 16:16      4    010523 P4 ARS1 STD W*
Thursday PM     24-MAY-01 09:30      1    010524 P1 ARS2 MEDOC 
Thursday PM     24-MAY-01 14:34      4    010524 P4 ARS1 STD W 
Friday PM       25-MAY-01 09:30      1    010525 P1 ARS2 MEDOC
Friday PM       25-MAY-01 14:34      4    010525 P4 ARS1 STD W 
Saturday PM     26-MAY-01 09:29      1    010526 P1 ARS2 MEDOC 
Saturday PM     26-MAY-01 14:34      4    010526 P4 ARS1 STD W 

The date part of a table ID reflects the UT date of pass 1.

A '*' means that the UT date of pass 1 differs from the JST date
of the pass in question 

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.