16 October 1999
                                                            L. Fletcher 
							    H. Hudson
 
                   CHIEF OBSERVER'S REPORT for Week 42 
                        10-Oct-99 to 16-Oct-99


GENERAL

Solar activity has remained low all week, but with some hopeful signs of 
increase. Several C-class flares were recorded, and an X1.8 event on 14-Oct-99 
09:00 UT. The X-ray baseline climbed slowly, reaching C-level at the end of the
week.

SXT TECHNICAL 

The instrument continued to perform well all week, no new problems to
report.

For Web material see

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/991015.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

This week's science nugget describes a polar crown filament eruption.

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

Lyndsay Fletcher arrived from Palo Alto. Dave McKenzie left for a short trip 
to Taiwan.


SEMINARS

2 seminars, on Thursday October 14th:

'A Sharper Tool than the Aly Conjecture' - Hugh Hudson (SPRC)
and
'Balloon Project for Hard X-ray Flare Observations' - K. Kobayashi (Tokyo U.)




                       SXT TABLE PLAN, WEEK 43
                       (18-Oct-99 to 23-Oct-99)
                              DRAFT

This week emphasizes joint flare observations with SUMER and TRACE,
among others. See http://www.solar.isas.ac.jp/sxt_co/sxt_future.html
for details. This week has extremely poor KSC coverage, so that it
will not be possible to do two uploads in any given day. We are
trying this on Monday but with the contingency plan that the
second table could be postponed if necessary. 

________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Monday          18-OCT-99 03:33    1      991018 P1 ARS1 DARKCAL 
Monday          18-OCT-99 08:40    4      991018 P4 ARS1 DIFF 
Tuesday         19-OCT-99 07:10    3      991019 P3 FLARE SPEC 
Wednesday       20-OCT-99 07:24    3      991020 P3 FLARE SPEC 
Thursday        21-OCT-99 04:11    2      991021 P2 FLARE SPEC
Friday          22-OCT-99 04:25    3      991022 P3 FLARE SPEC 
Saturday        23-OCT-99 01:14    1      991022 P1 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.