CHIEF OBSERVER'S REPORT for Week 23
                      4-Jun-01 through 10-Jun-01 

                               A. Takeda

GENERAL 

Flare activity was moderate with four M-class flares reported. Two of them
came from AR 9488, which passed through the south-east quadrant during the
week.  Late in the week, AR 9484 has raised its activity. A few late C-
through early M-class flares are reported.

SXT TECHNICAL 

In the current flare sequence, we sometimes find abnormal images (e.g.  
5-Jun-01 04:50:59), which are taken in Be filter at DPE 26, the current
maximum DPE. To avoid this, the flush counts for Be-filter was updated on
6th from Pre-roi/Full/Pre-exp = 4/1/1 to 8/1/1. As a result, the anomaly
has not appeared since the next run of flare mode (e.g. 8-Jun-01
02:27:39).

It turned out that SXT_CO had made mis-operation and flare patrol
images had not been taken since 18th May. This caused loss of data in two
flares occurred on AR 9488. The situation will be corrected in Monday's
first table.

A new flare table for support of HESSI will be tried in this coming week.  
Details given in the table plan below.

SXT SCIENTIFIC
 
For Web material see the science nuggets:
 
Current Week: http://isass1.solar.isas.ac.jp/sxt_co/010608.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html
 
This week's science nugget is intended for those who are planning
scientific observation of the total eclipse expected on 21st this month.  
Recent sunspot activity is summarized, and forecasting a promising target 
for the observations with small FOV.

CAMPAIGNS 

No campaign scheduled during the week.

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

A. Takeda came back on 4th from AGU, and D. McKenzie arrived on 7th.

SEMINARS

No seminar for this week.


                     SXT TABLE PLAN, WEEK 24
                   (11-Jun-01 through 17-Jun-01)

This week, we will try a new flare table to support the observations
with HESSI, whose launch is scheduled around 20-Jun.  The new table is 
has 1x1 FOV with 2 filters to achieve high cadence, and exposures 
optimized for no saturation.
_______________________________________________________________

JST Day         UT Start Time      Pass        Table ID

Monday AM       11-JUN-01 02:42      2    010611 P2 ARS1 DRK
Monday PM       11-JUN-01 06:05      4    010611 P4 ARS1 STD
Tuesday AM      12-JUN-01 01:01      1    010612 P1 ARS1 DIF
Tuesday PM      12-JUN-01 06:05      4    010612 P4 ARS1 STD
Wednesday AM    13-JUN-01 02:41      2    010613 P2 ARS1 STD
Thursday AM     14-JUN-01 02:41      2    010614 P2 ARS1 STD
Friday AM       15-Jun-01 01:00      2    010615 P2 ARS1 STD
Saturday AM     16-Jun-01 00:59      2    010616 P2 ARS1 STD

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

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.