26 September 1999 
                                                               H. Hudson        
 
                   CHIEF OBSERVER'S REPORT for Week 39
                        20-Sep-99 to 26-Sep-99


GENERAL

The biggest flare was a C9.4 (Sep. 21), and the bottom kind of dropped
out of solar activity by mid-week. A combination of uplink problems
(transmitter) and typhoons conspired so that we lost two days of data,
but things looked very normal entering the weekend. 

SXT TECHNICAL 

No particular problems. The Yohkoh normal pointing will need an update
on Monday evening.

SXT SCIENCE

We missed a couple of "flareless CMEs" (this is Joe Gurman's oxymoron,
not mine) because of poor coverage. Interestingly the first of them 
reportedly had a high velocity, something not normally associated with
quiet-Sun events.

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/990917.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

This week's science nugget summarizes Hudson's weird idea about solar
magnetic implosions. It is abjectly theoretical, but don't worry - at
this level of theoretical work, there are no equations!

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

We are engaged in informal specialized observations aiming at the
ceaselessly interesting interconnecting loops.

PERSONNEL

N. Nitta returned to Palo Alto. B. Handy arrived from Bozeman.

SEMINARS

None on account of the equinoctial holiday.



                       SXT TABLE PLAN, WEEK 40 
                       (27-Sep-99 to 3-Oct-99)

If the Sun continues to be not active, we will continue to explore the 
sequences to observe interconnecting loops.  But it is up the 
SXT CO, Brian Handy.

________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Monday          27-Sep-99 14:13    1      990927 P1 ARS1 STD 
Tuesday         28-Sep-99 16:09    3      990928 P3 ARS1 DARK 
Wednesday       29-Sep-99 12:58    1      990929 P1 ARS0 IL+DIFF 
Wednesday       29-Sep-99 18:05    4      990929 P4 ARS1 STD 
Thursday        30-Sep-99 14:54    2      990930 P2 ARS0 IL
Thursday        30-Sep-99 16:36    3      990930 P3 ARS1 STD
Friday           1-Oct-99 11:44    1      991001 P1 ARS0 IL 
Friday           1-Oct-99 15:07    3      991001 P3 ARS1 STD
Saturday         2-Oct-99 11:56    1      991002 P1 ARS0 IL 
Saturday         2-Oct-99 17:03    4      991002 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.