CHIEF OBSERVER'S REPORT for Week 11 12-Mar-01 through 18-Mar-01

N. Nitta, A. Takeda

GENERAL

Flare activity has been low this week. No M-class flares nor flare-mode events with SXT are reported. Later in the week, there has been several B to C-class activities, which mainly come from AR9373.

SXT TECHNICAL

No problem this week.

SXT SCIENTIFIC

For Web material see the science nuggets:

Current Week: http://isass1.solar.isas.ac.jp/sxt_co/010316.html Index: http://isass1.solar.isas.ac.jp/sxt_co/index.html

The newest nugget, "Twin-dimming event of 28 February 2001", describes an eruptive event which accompanies a pair of dimming regions and partial helo CME. Although the erupting plasma shows S-shape in SXT image, there were no sigmoid in this region before eruption. What was there is an S-shaped dark filament.

CAMPAIGNS

No major campaigns during the week. We kept to be on the alert for sigmoids as Target Of Oportunity.

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

N. Nitta left on 16th.

SEMINARS

S. W. Kahler (AFRL) "A synoptic view of particle acceleration in coronal/interplanetary shocks"

SXT TABLE PLAN, WEEK 12 (18-Mar-01 through 24-Mar-01)

DRAFT

We plan to coordinate with the VLA on two days. Otherwise the operations will be quite normal waiting for the appearance of a nice sigmoid as TOO.

JST Day UT Start Time Pass Table ID

Monday AM      18-MAR-01 18:19     1      010318 P1 ARS2 VLA*
 Monday AM      18-MAR-01 23:24     4      010318 P4 ARS1 STD*
 Tuesday AM     19-MAR-01 18:21     1      010319 P1 ARS1 DARK*
 Tuesday AM     19-MAR-01 23:26     4      010319 P4 ARS1 DIF*
 Wednesday AM   20-MAR-01 18:23     2      010320 P2 ARS1 STD*
 Thursday AM    21-MAR-01 18:25     2      010321 P2 ARS1 STD*
 Friday AM      22-MAR-01 18:27     2      010322 P2 ARS1 STD*
 Saturday AM    23-MAR-01 16:47     1      010323 P1 ARS2 VLA*
 Saturday AM    23-MAR-01 21:53     4      010323 P4 ARS1 STD*
The date part of a table ID reflects the UT date of pass 1.

A '*' means that the UT date of pass 1 differs from the JST date of the pass in question

This table plan is likely to change. Prepare for last minute changes.

Continuing requests:

KSC & SSOC Tohbans: If any KSC passes are likely to be cancelled (for example due to typhoons) or an SXT table cannot be uploaded for any 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.