February 8, 1999 Hugh Hudson
SXT CHIEF OBSERVER'S REPORT AND TABLE PLAN
CHIEF OBSERVER'S REPORT for Week 06 31-Jan-99 to 7-Feb-99
GENERAL
SXT continues to perform properly, except for the new rupture (see below) and one day's rest resulting from a poorly timed SEU. Solar activity was as low as it has been during this maximum, although there was abundant evidence of high activity on the invisible hemisphere (a C5 LDE on Feb. 4, at which time the major spot group, 8446, was about two days beyond the W limb).
SXT TECHNICAL
SXT lost another piece of its entrance filter, resulting in another increment of the stray-light level. The software is still recovering and we've taken Al.1 out of the movie sequence in the meanwhile.
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/990205.html Index: http://www.solar.isas.ac.jp/sxt_co/index.htmlThe current Nugget discusses the MHD of arcade flare morphology, plus the observability of preflare brightening, using a flare of Dec. 23, 1998, as an example.
CAMPAIGNS
We've been running in support of an ill-starred flare campaign at Sac Peak. We hope they get something this week! Meanwhile, SOHO has started up again, and we have a future joint observation of active regions scheduled with SUMER.
Please see the general coordination page at: http://sec.noaa.gov/solcoord/solcoord.html
PERSONNEL
Loren Acton arrived for a month's visit.
SEMINARS
D. McKenzie (MSU) "Arcade Formation During the 20-Jan-99 Slow LDE Flare" H. Hudson (SPRC) "Reconnection at Streamer Cusps?" (journal review)
SXT TABLE PLAN, WEEK 7 (8-Feb-99 to 14-Feb-99)
The Sac Peak campaign led by Gianna Cauzzi will continue through the beginning of this week (through Feb. 12 and maybe longer - we will encourage them to continue if they can, because they have had very bad luck thus far with weather, space instruments, and solar activity).
Monday 8-FEB-99 04:57 1 990208 P1 ARS1 TERM Monday 8-FEB-99 06:39 2 990208 P2 ARS2 STD Tuesday 9-FEB-99 05:12 2 990209 P2 ARS2 DARKCAL Wednesday 10-FEB-99 05:28 2 990210 P2 ARS2 DIFF Thursday 11-FEB-99 04:02 2 990211 P2 ARS2 STD Friday 12-FEB-99 04:18 2 990112 P2 ARS2 STD Saturday 13-FEB-99 04:34 2 990113 P2 ARS1 STDContinuing 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.