CHIEF OBSERVER'S REPORT for Week 19
                      7-May-01 through 13-May-01 

                         H. Hudson, A. Takeda

GENERAL 

Solar activity was not remarkable during the weekdays, although AR 9445, 
the target of the sigmoid campaign, geterated a few C-class events. 
In the weekend, AR 9454 grew up obviously and produced two M3-class flares. 

SXT TECHNICAL 

No new problems.

SXT SCIENTIFIC

For Web material see the science nuggets:

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/010511.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

This week's science nugget presents a quick report of the sigmoid campaign we
kicked off on 3rd May. Summarizing the activity of the target region, AR 9445,
we discuss about the relation among those things: flares, CMEs, energy-buildup,
and helicity-buildup.

CAMPAIGNS 

On 10th, we discontinued the sigmoid campaign on AR 9445, which was approaching 
to the west limb. We think it worked well this time, since several eruptive 
flares from 9445 followed the original announcement.

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

R. Canfield left on 9th, H. Hudson left on 12nd.

SEMINARS

No seminar for this week.


                     SXT TABLE PLAN, WEEK 20
                   (13-May-01 through 19-May-01)

For weeks 20 and 21, we will cooperate with the 7th MEDOC (Multi-
Experiment Data Operation Centre for SoHO) campaign, which consists 
of several independant campaigns. For week 20, we will support 
JOP131/107 "Dynamics of Active Regions/Ly alpha in prominences", 
lead by B. Schmieder. The main targets of this campaign are 
prominences and filaments. We plan to go to ARS0 mode during the KSC 
contacts to observe a dark region in PFI, and outside KSC passes, 
we will observe the bright region as usual. Please keep in mind the 
fact, however, in case a region with significant brigtness appears 
on the disk, we might change the strategy.
 _______________________________________________________________

JST Day         UT Start Time      Pass   Table ID

Monday AM       13-MAY-01 17:55      2    010513 P2 ARS1 DRK W*
Monday AM       13-MAY-01 21:19      4    010513 P4 ARS1 DIF W*
Monday PM       14-MAY-01 14:34      1    010514 P1 ARS0 MEDOC
Tuesday AM      14-MAY-01 17:56      3    010514 P3 ARS1 STD W*
Tuesday PM      15-MAY-01 14:34      1    010515 P1 ARS0 MEDOC
Wednesday AM    15-MAY-01 17:56      3    010515 P3 ARS1 STD W*
Wednesday PM    16-MAY-01 14:33      1    010516 P1 ARS0 MEDOC 
Thursday AM     16-MAY-01 17:56      3    010516 P3 ARS1 STD W*
Thursday PM     17-MAY-01 12:53      1    010517 P1 ARS0 MEDOC 
Friday AM       17-MAY-01 17:56      4    010517 P4 ARS1 STD W* 
Friday PM       18-MAY-01 12:53      1    010518 P1 ARS0 MEDOC
Saturday AM     18-MAY-01 17:57      4    010518 P4 ARS1 STD W 
Saturday PM     19-MAY-01 12:52      1    010519 P1 ARS0 MEDOC 
Sunday AM       19-MAY-01 17:57      4    010519 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.