February 6, 2000 
                                                             H. Hudson 


 
                   CHIEF OBSERVER'S REPORT for Week 06 
                       29-Jan-00 through 6-Feb-00 


GENERAL 

Activity soared, yielding an actual X-class flare today. That
brings this year's count to 10 M, 1 X for those interested in
statistics.

SXT TECHNICAL 

No problems. We broached the idea of a redefinition of the normal
pointing coordinates, moving the Sun about 15 HR pixels to the left
on the CCD, in order to be gentler with the limb regions prone to
artifacts. Minimal feedback resulted from this suggestion, so if
the WOM approves it we will execute the repointing as soon thereafter
as possible. 

For Web material see

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/000204.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

The science nugget this week shows solar rotation, based on a
recent APOD and work of Sam Freeland, and also shows a butterfly
diagram that may contain about 2% of all the photons detected
by SXT.

CAMPAIGNS 

No coordinated campaigns have been scheduled for this week. We
are unable to do KSC uplink/downlink between Monday and Friday
because of the Astro-E launch.

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
S. Yashiro, "Relation between Thermal and Magnetic Properties
  of Active Regions" - Dr. Yashiro, now!


                       SXT TABLE PLAN, WEEK 7
                       (7-Feb-00 to 13-Feb-00)

There is a VLA program this week, but we probably cannot do any
special support because of the lack of KSC passes. Because of the
Astro-E launch, we are reduced to 10 passes and will have an 
unprecedented three-day holiday Feb. 8-10 (JST). Worse yet, there
is a Shuttle launch so we are at the mercy of Wallops cancellations.
So this is a minimal plan.

There are question marks on the passes of Feb. 10, so we may get
them back and would then adjust the plan accordingly. Because
of the reduced schedule, we moved the calibrations up to today.


________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Sunday AM       5-Feb-00 23:54     2      000205 P2 ARS1 DIFF* 
Sunday PM       6-Feb-00 03:20     4      000205 P4 ARS1 DARKCAL* 
Monday AM       6-Feb-00 22:24     1      000206 P1 ARS1 STD*
Friday AM      11-Feb-00 02:35     4      000210 P4 ARS1 STD*
Saturday AM    11-Feb-00 21:38     2      000211 P2 ARS1 STD*

The * on Friday means that the UT date of the upload does not match the
JST date.

Continuing requests:

KSC & SSOC Tohbans: If any KSC passes are likely to be cancelled (for
example due to heavy snowfall) 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).

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.