July 9, 1999 
                                                   B. Handy, H. Hudson 
 
                 CHIEF OBSERVER'S REPORT for Week 28
                       5-Jun-99 to 11-Jul-99

GENERAL

Activity continues to be moderately high, with many C flares, several M
flares, and still no X flares, supporting the Hudson heuristic:  "Big
flares only occur in the rising and declining phases of solar
activity."


SXT TECHNICAL 

The new terminator aquisition cycle has begun this week following 
the Yohkoh repoint on 2 July.  The mainframe will be taken offline on
11-July, we will upload a standard table with an Al.1 terminator image
to run until that Thursday, 15-July-1999.

There were two false flare flags this week.

[Post-weekly meeting note:  It is not likely the mainframe will be back
up in time for the Thursday pass.  The table schedule will probably be
revised this week.]

The CCD bakeout will likely take place the following week.


SXT SCIENCE

For Web material see

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/SXTweekly.html
Current Week: http://isass1.solar.isas.ac.jp/sxt_co/990709.html
Index:        http://isass1.solar.isas.ac.jp/sxt_co/index.html

CAMPAIGNS

For more information on campaigns, see:

http://sec.noaa.gov/solcoord/solcoord.html

For SXT plans, see:

http://isass1.solar.isas.ac.jp/sxt_co/sxt_future.html

PERSONNEL

No change.

SEMINARS

There were no seminars this week.

                       SXT TABLE PLAN, WEEK 28
                        (4-Jul-99 to 10-Jul)

We won't be able to upload any tables until the SIRIUS mainframe is
back on line.  We will plan on a new table load on Thursday.  No 
coordination with other observatories is planned for this week, and 
the following week we will likely do a CCD bakeout.

________________________________#_______________________________

JST Day         UT Start Time      Pass   Table ID

Thursday	15-JUL-99 03:01    2      970715 P2 ARS1 DARK
Friday          16-JUL-99 03:15    2      970716 P2 ARS1 DIFFUSER 
Saturday        17-JUL-99 03:30    3      970717 P3 ARS1 STANDARD 

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.