May 15, 2000 
                                                           H. Hudson 


 
                   CHIEF OBSERVER'S REPORT for Week 21
                        8-May through 14-May-00


GENERAL 

Yohkoh finished supporting JOP122 (network flares). As soon as this
was done, activity began to rise from its amazingly low level last
weekend, to a substantial level this weekend. There were major flares
from several regions. Truly the Sun can be lopsided.

SXT TECHNICAL 

SXT functioned properly. As a result of the campaign operation, however,
there was an unwanted overexposure and the blemish region at the W limb
became worse. It appears to be recovering now.  

SXT SCIENTIFIC

We ran "rapid run" SFDs for three days this week. 

For Web material see

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/000512.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

This week's nugget follows up on the May 5 event mentioned last week.
The data are quite nice and appear to show a heated filament flying
up from far behind the limb - for us, just barely caught in the QR
field, but for EIT clearly seen in one full-Sun frame.

CAMPAIGNS 

There are no scheduled campaigns. We will keep our eyes open for targets
of opportunity.

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

Brian Handy departed, and returned.

SEMINARS

Last week: none. T. Sakurai gave the Friday talk at NAO, in which he presented
his astounding geophysics result regarding sky-brightness fluctuation on the
11-year cycle.

This week: TBD.


                      SXT TABLE PLAN, WEEK 21 
                      (14-May-00 - 20-May-00)

Campaigns: None scheduled at present. 

________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Monday PM      15-MAY-00 03:55     4      000514 P4 DKCAL*
Tuesday AM     15-MAY-00 22:58     1      000515 P1 DIFF*
Tuesday PM     16-MAY-00 04:04     4      000515 P4 STD*
Wednesday AM   17-MAY-00 02:31     3      000516 P3 STD*
Thursday AM    18-MAY-00 00:58     3      000517 P3 STD*
Friday AM      18-MAY-00 23:25     2      000518 P2 STD
Saturday AM    20-MAY-00 01:17     4      000519 P4 STD* 

(* signifies that the UT and JST dates don't match on pass 1)

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.