June 6, 1999 
							                                                     Hugh Hudson 
 
                 CHIEF OBSERVER'S REPORT for Week 23
                       31-May-99 to 6-Jun-99

GENERAL

Activity was moderately high, including two M-class flares neither
of which occurred during orbit day. Major activity seems to have been
happening on the invisible hemisphere, leading to a prediction of a
possible "super region" rotating onto the disk during Week 24.

SXT TECHNICAL 

No problems. We did not have to re-point this week after all.

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/990604.html
Index:        http://www.solar.isas.ac.jp/sxt_co/index.html

This week's science nuggets follows through on the sigmoids noted
here last week, and shows a graphic from the over-the-limb
activity in the north. Both of the sigmoids eventually blew, but
the "loaded guns" were pointed away from the Earth.

CAMPAIGNS

JOP 103 (moss) continued. This week (starting Monday 18:00 UT) we will
offpoint to support UVCS, TRACE, and other observations.

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

No changes. Piet Martens is expected this week.

SEMINARS

No seminar last week. We may also have to skip this week because of
Solar-B meetings.

                               
                      SXT TABLE PLAN, WEEK 24
                        (6-Jun-99 to 11-Jun)

The UVCS campaign will start on June 7, and we will want to do offpoints
to the OG #85 (dec) location at times that will be determined by
the detailed programs of the SOHO instruments. These begin during
the interval 18:00-24:00 UT on 7-Jun.

________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Monday           6-JUN-99 20:47    2      950606 P2 ARS1 UVCS*
Tuesday          7-JUN-99 21:02    2      950607 P2 ARS1 UVCS* 
Wednesday        8-JUN-99 21:17    2      950608 P2 ARS1 DAUVCS* 
Wednesday        9-JUN-99 00:42    4      950608 P4 ARS1 DIUVCS
Thursday         9-JUN-99 21:32    3      960609 P3 ARS1 UVCS*
Friday          10-JUN-99 21:47    3      960610 P3 ARS1 UVCS* 
Saturday        11-JUN-99 18:37    2      960611 P2 ARS1 STD* 

As previously, the (*) in a table name means that the UT date and
the JST date don't match. We don't know the available passes yet
for the week of the 6th and therefore can't assign them yet.

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, 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.