August 30, 1999 
                                                             H. Hudson 
 
                   CHIEF OBSERVER'S REPORT for Week 35
                         23-Aug-99 to 30-Aug-99


GENERAL

The level of solar activity rose yet again, providing another (the year's
second) X-class flare plus five M-class flares as of Sunday afternoon.
The X-class flare followed a prediction by Big Bear regarding region
8674 S24W28   244  0730 FKC  23   87 BETA-GAMMA-DELTA.

SXT TECHNICAL 

The WOM meeting came to a concensus about flare mode, agreeing to try
a higher threshold. One consideration not in our earlier notes about
this surfaced - since BCS works best with weak flares, this may
substantially reduce the number of well-observed flares. On the other
hand, BCS will still get its interesting preflare data on larger events.

A normal pointing update was executed August 28. 

The Chief Observer was not present Tuesday through Saturday of this week,
and SSOC tohban H. Hara filled in.

SXT SCIENCE

No particular news, except for the campaign activities. This week's CO
went to the Monterey TRACE meeting, which was extremely enjoyable, and 
announced his new conjecture regarding magnetic implosions. This was
met with skepticism, disbelief, and a lot of discussion.

For Web material see

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/SXTweekly.html
Current Week: http://isass1.solar.isas.ac.jp/sxt_co/990827.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

This week's science nugget deals with the experimental fast-cadence FFI
data obtained this week. Based on the image performance, we propose
to substitute this for some of the movie, at the CO's discretion.

CAMPAIGNS

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 changes. 

SEMINARS

None.



                       SXT TABLE PLAN, WEEK 36 
                         (30-Aug to 5-Sep-99)

The coordinated observations this week continue with Whole Sun Month 3
and the MM02, the sigmoid target-of-opportunity study.

________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Monday          30-AUG-99 04:04    1      990830 P1 ARS1 STD 
Tuesday         31-AUG-99 06:00    3      990831 P3 ARS1 DARK 
Wednesday        1-SEP-99 02:49    1      990901 P1 ARS1 DIFF 
Wednesday        1-SEP-99 07:57    4      990901 P4 ARS1 STD 
Thursday         2-SEP-99 04:46    3      990902 P3 ARS1 STD
Friday           3-SEP-99 05:00    3      990903 P3 ARS1 STD 
Saturday         4-SEP-99 05:14    4      990904 P4 ARS1 STD 

This plan is subject to change.

Continuing requests:

KSC & SSOC Tohbans: If any KSC passes are likely to be cancelled (for
example due to a typhoon) or an SXT table cannot be uploaded for some
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).

SSOC Tohban: On the weekly visible diagram, please mark the official
five passes first and then cross out those passes that will be given to
other satellites.  That way we can keep the numbering straight in the
Yohkoh software system.

SSOC Tohban: SXT operations do not currently include terminator off-
pointing. It is unnecessary this week to ask the SXT Chief Observer
for terminator off-pointing information.

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.