February 14, 1999 
                                                               Hugh Hudson  


              SXT CHIEF OBSERVER'S REPORT AND TABLE PLAN

                CHIEF OBSERVER'S REPORT for Week 07
                        8-Feb-99 to 15-Feb-99

GENERAL

SXT continues to perform properly, and the software system has caught
up with terminator corrections for the new stray-light configuration.
Solar activity resumed after the quiet interval. The Sac Peak joint
observing campaign was pretty much of a bust, and sure enough - as soon
as it was finished, the target region flared in an extremely interesting
way (see this week's science nugget).

SXT TECHNICAL

The software system required some extensive prodding this time, mainly 
by Greg, but has now recovered the SXT stray-light correction capability.
As of the end of the week, we had six new succesful terminator images -
two each in AlMg, Al.1, and Al12. The images look OK but there may be
a stronger tendency towards the "retina pattern" in the Al.1 SFDs.

SXT SCIENCE

For Web material see

Current Week: http://www.solar.isas.ac.jp/sxt_co/SXTweekly.html
Current Week: http://www.solar.isas.ac.jp/sxt_co/9902122html
Index:        http://www.solar.isas.ac.jp/sxt_co/index.html

The current Nugget discusses interconnecting loops, one of which 
appeared in a most remarkable way following a flare.  

CAMPAIGNS

We finished our support of the ill-starred flare campaign
at Sac Peak. Better luck next time! This week there will be
some active-region observations at the VLA, and we will try
to follow along if possible.

Please see the general coordination page at:
http://sec.noaa.gov/solcoord/solcoord.html

For SXT plans, finger campaign@isass0.solar.isas.ac.jp.

PERSONNEL

D. McKenzie departed.

SEMINARS

None due to national holiday






                   DRAFT SXT TABLE PLAN, WEEK 8
                     (15-Feb-99 to 20-Feb-99)


The VLA will be making active-region observations, and we plan 
tentatively to run with ARS2 on their region. The details remain
to be decided. VLA dates are Feb. 13, 15, 19, 20, 27, and 28,
typically in the range 18:00-23:00 UT.


________________________________#_______________________________

JST Day         UT Start Time      Pass    Table ID

Monday          15-FEB-99 03:29    2      990215 P2 ARS2 VLA 
Tuesday         16-FEB-99 01:57    2      990216 P2 ARS1 DARKCAL 
Wednesday       17-FEB-99 02:13    2      990217 P2 ARS1 STD 
Thursday        18-FEB-99 00:47    2      990217 P2 ARS1 STD (*)
Friday          19-FEB-99 01:03    2      990118 P2 ARS2 VLA (*)
Saturday        20-FEB-99 01:19    2      990119 P2 ARS1 STD (*)

(*) => table name adopts the convention of UT date of first pass

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, ie 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.