February 28, 1999 Hugh Hudson
SXT CHIEF OBSERVER'S REPORT AND TABLE PLAN
CHIEF OBSERVER'S REPORT for Week 9 23-Feb-99 to 1-Mar-99
GENERAL
SXT continues to perform properly, and there is nothing special to report. Solar activity continued at a low level.
SXT TECHNICAL
Yohkoh executed another "normal pointing update," as we attempt to get a proper set of Al.1 terminator images for stray-light correction. In a "quick reformat" of data on Feb. 23, aiming at a science nugget, the CO noticed many gaps in the images. This happens sometimes - can it be repaired by re-transmission and re-copying into Sirius? On his last visit, Greg Slater suggested that we routinely reformat new acquisitions temporarily, and if we did that we might be able to catch situations like this more easily.
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/990226html Index: http://www.solar.isas.ac.jp/sxt_co/index.htmlThe current Nugget shows a weak polar example of Ron Moore's Elbows.
CAMPAIGNS
There was a desultory attempt to look at the same target as the VLA this week, a task made difficult by the fact that neither the VLA nor our standard coordination Web page has chosen to report VLA targets. Repeated e-mail reminders have also produced no results.
We also worked with TRACE in an attempt to find clean loops for a Klimchuk analysis of loop geometry, Feb. 24 - perhaps not so successful, it is quite difficult to find non-overlapping loops.
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.
SEMINARS
L. Acton (MSU): 1. "Conversion of SXT fluxes to irradiances"
2. "Deriving solar X ray irradiance from Yohkoh
observations" SXT TABLE PLAN, WEEK 10 (28-Feb-99 to 7-Mar-99)
There are no firm joint observing plans for this week, but we will as usual keep an eye on TRACE or various SOHO plans for targets of opportunity.
Tuesday 1-MAR-99 22:50 4 990301 P4 ARS1 DAR (*) Wednesday 2-MAR-99 19:40 2 990302 P2 ARS1 DIF (*) Thursday 3-MAR-99 18:13 2 990303 P2 ARS1 STD (*) Friday 4-MAR-99 18:29 2 990304 P2 ARS1 STD (*) Saturday 5-MAR-99 17:02 2 990305 P2 ARS1 STD (*)(*) => table name adopts the convention of UT date of first pass
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.