1 October 1999
                                                             B. N. Handy
 
                   CHIEF OBSERVER'S REPORT for Week 40
                        27-Sep-99 to 4-Oct-99


GENERAL

Solar activity has remained low all week, though activity has improved
since last week.  Several high C-class flares were recorded, but the 
x-ray baseline remains at the mid-B level.

SXT TECHNICAL 

SXT observed a C9 class flare on 28-Sep-1999.  What is noteworthy 
about this flare is that the flux level was below the current threshold
of the flare trigger.   We have about 5 SFD images immediately following 
this flare so this may provide a unique perspective on the global response
to this event.  The SXT CO found himself far from ISAS on two separate 
occasions this week and missed some non-critical table loads.


For Web material see

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/991001.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

This week's science nugget summarizes the process of data reduction 
for SFD images.  This nugget is certified equation-free.

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

Phil Shirts arrived from Palo Alto.

SEMINARS

G. Vekstein gave a spirited discussion on Magnetic Reconnection.



                       SXT TABLE PLAN, WEEK 41 
                       (4-Oct-99 to 10-Oct-99)

The plan is largely contingent on the whims of solar activity.  If the
sun remains quiet and placid, we will continue the [ceaselessly
interesting] Joe Khan Interconnecting Loops campaign.  Otherwise, we
will pursue some active region studies.

________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Monday		 4-Oct-99 10:40    1      991004 P1 ARS1 STANDARD
Tuesday          5-Oct-99 12:36    2      991005 P2 ARS0 IL
Tuesday          5-Oct-99 14:18    3      991005 P3 ARS1 DARKCAL
Wednesday        6-Oct-99 11:07    2      991006 P2 ARS0 IL+DIFF
Wednesday        6-Oct-99 14:32    4      991006 P4 ARS1 STANDARD
Thursday         7-Oct-99 18:38    1      991007 P1 ARS1 STANDARD
Friday           8-Oct-99 08:10    1      991008 P1 ARS0 IL
Friday           8-Oct-99 11:34    3      991008 P3 ARS1 STANDARD
Saturday         9-Oct-99 10:05    2      991009 P2 ARS0 IL
Saturday         9-Oct-99 11:47    3      991010 P3 ARS1 STANDARD


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.