                                                          24 October 1998
                                                            David Mckenzie
                                                               Hugh Hudson

SXT CHIEF OBSERVER'S REPORT AND TABLE PLAN

CHIEF OBSERVER'S REPORT for Week 43 19-Oct-98 to 24-Oct-98

GENERAL

Yohkoh and SXT have performed well this week, despite continuing computer hiccups at the ground support station at Kagoshima. Solar activity was moderate, with one M flare and a number of C flares.

SXT TECHNICAL

We will probably request a normal pointing update early this week. We intend to do a bakeout soon, probably next week.

All of the SXT observer types will be up at Nobeyama. We intend to leave two tables on line Monday evening, and to request the KSC tohbans to transfer them according to the plan. We will be accessible at

Tel: 0551-48-2111 (+81-551-48-2111) (Hotel Seisenryo) Fax: 0551-48-2099 (+81-551-48-2099)

and will be logging on from a nearby radio observatory as need be.

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/981023.html
 Index:        http://www.solar.isas.ac.jp/sxt_co/index.html

This week brings the anniversary of the "Science Nuggets" webpage: one full year of Nuggets. The topic is a sigmoid-shaped active region that produced a halo CME, very similar to the very first Science Nugget of 24-Oct-97.

CAMPAIGNS

There were no formal campaigns this week. We stared at a target region in the northeast, to support TRACE's hopes of seeing an emerging flux region.

PERSONNEL

No changes.

SEMINARS

The seminar this week was given by T. Yoshida, who described the use of mulitple analysis filters to determine the differential measure of plasma observed by SXT. Solution for the DEM in this way yields a somewhat different estimate of the plasma conditions than the standard filter ratio method.

TABLE PLAN, WEEK 44 (26-Oct-98 -- 31-Oct-98)

We look forward to synchronizing again with SOHO. There seem to be no coordinated observations planned yet for this week.

JST Day UT Start Time Pass Table ID

Monday          26-Oct-98 08:09    2      981026 P2 ARS1 STD 
 Tuesday         27-Oct-98 08:26    2      981027 P2 ARS1 DARKCAL
 Wednesday       28-Oct-98 07:00    2      981028 P2 ARS1 DIFF
 Thursday        29-Oct-98 05:35    1      981029 P1 ARS1 STD
 Friday          30-Oct-98 05:51    2      981030 P2 ARS1 STD
 Saturday        31-Oct-98 06:08    2      981031 P2 ARS1 STD

This plan may change during the week.

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.