CHIEF OBSERVER'S REPORT for Week 17
                      23-Apr-01 through 29-Apr-01 

                         H. Hudson, A. Takeda

GENERAL 

No X-class flares, but ten M-class flares, mostly from AR 9433. This week's
wonderful event was the "slow LDE" of April 26, which included an 
impulsive component at the almost-X level of M7.8. This event featured
a sigmoid dimming and a Bastille-like arcade, and we will probably do
next week's science nugget on this.

SXT TECHNICAL 

The special flare table (2x2) has settled down after some refinement.
We now have four AlMg images, including one at FR with standard AEC,
plus a Be image FR at standard AEC. We have already seen some nice things
with these tables and will probably continue with them until HESSI is
launched.

SXT SCIENTIFIC

For Web material see the science nuggets:

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/010427.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

This week's science nugget takes a break from big flares and discusses
transient coronal holes,

CAMPAIGNS 

We jointly observed with the VLA and Nancay as a part of JOP140.

We remain on the alert for sigmoids as a Target Of Opportunity.

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

Visitor S. Kahler departed.

SEMINARS

None this week.


                     SXT TABLE PLAN, WEEK 18
                   (30-Apr-01 through 5-May-01)


JOP 140 may continue to run, but we don't know the schedule.
We will continue to run the special flare table for waves.
________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Monday AM      30-APR-01 00:36     3      010429 P3 ARS1 STD W*
Tuesday AM     30-APR-01 21:14     1      010430 P1 ARS1 DAR W 
Tuesday PM      1-MAY-01 02:19     4      010430 P4 ARS1 STD W* 
Wednesday AM    1-MAY-01 22:55     2      010501 P2 ARS1 DIF W
Wednesday PM    2-MAY-01 02:19     4      010501 P4 ARS1 STD W*
Thursday AM     2-MAY-01 21:15     2      010502 P2 ARS1 STD W
Friday AM       3-MAY-01 21:15     2      010503 P2 ARS1 STD W 
Saturday AM     5-MAY-01 00:39     4      010504 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.