CHIEF OBSERVER'S REPORT for Week 34 
                      20-Aug-01 through 26-Aug-01 

                              A. Takeda

GENERAL 

Solar activity has significantly increased since the appearance of NOAA 9591,
which produced an X5.3 flare on 25th Aug. This region is the return of 9557, 
the suspected source of the proton event from the backside of the Sun 
recorded on the 16th, and the subsequent geomagnetic storm on the 17th. 

SXT TECHNICAL 

No new problem with the S/C. In contrast, we still had trouble with 
the operation supporting system at the Kagoshima Space Center, but finally 
it has been recovered during this weekend.  

SXT normal pointing was updated on 20th Aug.

We carried out a special calibration to test the straylight pattern on one of
the filters. The special tables were uploaded on 21st and 22nd and the images
obtained are being reviewed by L. Acton. 

SXT SCIENTIFIC
 
For Web material see the science nuggets:
 
Current Week: http://isass1.solar.isas.ac.jp/sxt_co/010824.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html
 
This week's nugget, "Reverberations of April 7, 1997", is the re-consideration 
of a sigmoid flare and an associated radio event observed in 1997.

CAMPAIGNS 

We supported the "Quiet Sun Campaign" lead by BBSO and CDS. We tried 2-step 
deeper exposures than normal FFIs on the 20th and high cadence PFIs in ARS0 pointing 
on the 21st. The support was until the AR 9591 returned and showed strong flare 
activity.

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

No change.

SEMINARS

No seminar this week



                     SXT TABLE PLAN, WEEK 35
                  (27-Aug-01 through 2-Sep-01)

The hard X-ray spectrometor will be launched by balloon on 28th Aug.,
and we plan a coordinated observation during the balloon flight.
There will be two tables uploaded on Tuesday and Wednesday.

_______________________________________________________________

JST Day         UT Start Time      Pass        Table ID

Monday PM       27-Aug-01 12:37      2    010827 P2 ARS1 BAL
Tuesday PM      28-Aug-01 10:55      1    010828 P1 ARS1 DIFF
Wednesday AM    28-Aug-01 15:58      4    010828 P4 ARS1 STD*
Wednesday PM    29-Aug-01 10:53      1    010829 P1 ARS1 DARK
Thursday AM     29-Aug-01 15:57      4    010829 P4 ARS1 STD*
Thursday PM     30-Aug-01 12:33      2    010830 P2 ARS1 STD
Friday PM       31-Aug-01 12:32      2    010831 P2 ARS1 STD 
Saturday PM      1-Sep-01 12:30      3    010901 P3 ARS1 STD                    

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.