FIRST_LIGHT

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Recent SXT movies: http://www.lmsal.com/SXT/movies/lastsfd.html
Recent TRACE movies : http://vestige.lmsal.com/TRACE/last_movies/
Recent EIT movies : http://sohowww.nascom.nasa.gov/sdb/http/eit_fullfov_java.html

FIRST_LIGHT - Yohkoh/SXT and Ground Based Data Summary

Text Summary Generated at: 16-FEB-99 11:17:27 UT.

GOES Events

NOAA Active Region Reports

Yohkoh Event Log (KSC / Near Real Time Data Summary

Yohkoh/SXT Campaign Planning Notes

SXT Chief Observer for Week 8: Hudson (sxt_co@isass0.solar.isas.ac.jp PREFERRED or lastname@isass0.solar.isas.ac.jp)

SXT Supertohban is currently: T. Shimizu (shimizu@flare2.solar.isas.ac.jp; telephone 0422-34-3720) or (sxt_st@flare2.solar.isas.ac.jp PREFERRED)

Tentative SXT Chief Observer Schedule is now available!

REVISED SXT TABLE PLAN, WEEK 8 (Ver. 2) (15-Feb-99 to 20-Feb-99)

The VLA will be making active-region observations, and we plan tentatively to run with ARS2 on their region. The details remain to be decided. VLA dates are Feb. 13, 15, 19, 20, 27, and 28, typically in the range 18:00-23:00 UT.

A series of solar eclipses takes place on Tuesday, Feb. 16. We do not plan special observations but there will be three episodes of relatively deep partial eclipses, spread out over the time range 04:45 to 09:15 UT, approximately. Some of the data are in KSC contact range, so we may have a quick-look glimpse.

JST Day UT Start Time Pass Table ID

Monday          15-FEB-99 03:29    2      990215 P2 ARS2 VLA 
Monday          15-FEB-99 08:32    5      990215 P5 ARS2 VLA 
Tuesday         16-FEB-99 01:57    2      990216 P2 ARS1 ECLIPSE 
Wednesday       17-FEB-99 02:13    2      990217 P2 ARS1 DARKCAL 
Thursday        18-FEB-99 00:47    2      990217 P2 ARS1 DIF (*)
Friday          19-FEB-99 01:03    2      990118 P2 ARS2 VLA (*)
Saturday        20-FEB-99 01:19    2      990119 P2 ARS1 STD (*)

Most recent SXT operations report from KSC is available at: http://www.lmsal.com/SXT/gbo_mail/sxt_coord_980702.2012.html

Campaigns current and in the near future

VLA active-region observations

Dates: Feb. 13, 15, 19, 20, 27, 28

Correspondents: TRACE

SXT setup: TBD

Annular solar eclipse

Dates: Feb. 16, 1999

SXT setup: nothing special planned, unless it has deep episodes. Stay tuned for information, or see the NASA eclipse page at http://umbra.gsfc.nasa.gov/eclipse/predictions/eclipse-paths.html

CDS preflare study

Dates: March 8-14, 1999

Correspondent: Neale Ranns

BAKEOUT

Dates: March 1999

SXT Setup: special tables

SUMER Jet Study

Correspondent: D. Innes

Dates: First two weeks in May 1999, depending on SUMER health.

SXT Setup: Fixed-exposure PFIs, one filter with two exposure durations. Target will be "target of opportunity" active region, probably on the limb.

Polar Jets

Correspondent: H. Hara

Dates: As much as possible when level of activity permits.

SXT setup: 4 x 1 (EW x NS) full resolution PFI on the N polar region (PFI covering half disk / half sky). AlMg filter with 30s exp.time, repeat every 5-10 min.

Dates: Did some 24-25 Oct-97, will continue as conditions warrant

Transit of Mercury - II

Correspondents: CO (Wuelser, Hudson)

Date: Nov. 15, 1999, 20:00-24:00

SXT setup: this time grazing occultation at the N pole (see http://www.arrakis.es/~xgarciaf/151199m.gif for a plot). Probably we'll put long thin FFIs there as we did before.

Experiments/Campaigns recently finished - we have no easy way to show this information, though it's available on miscellaneous versions of this ASCII file.

SPARTAN

The SPARTAN subsatellite was launched Nov. 1 and observed for its nominal two days, and on Nov. 2 the SOPHIE sounding rocket also made coronal observations. We tried to follow the schedules as best we could, but of course Yohkoh cannot observe the distant corona easily. So we emphasized observations of streamer bases and trans-equatorial interconnecting loops (the W limb showed a striking example on Nov. 1-2, and we obtained a time series of full-resolution observations. The analysis may shed more light on the origin of these structures, whether by reconnection or birth, or both, and the SPARTAN observations could be crucial even though largely at higher altitudes.

Dark Sunsets

Correspondent: L. Acton

Dates: As soon as allowable by the orbital elements. (Dec 97?)

Description: This is a one-orbit experiment requested by Professor Acton. The purpose is to collect dark-signal data, beginning right at S/C sunrise and continuing as far as possible into the orbit (FMS).

SXT Setup: Dedicate the FFI sequence to the following two entries. QR AlMg dark DPE=2 QR AlMg dark DPE=26

Additional information regarding these and other coordinated solar observations may be found on the WWW Selsis Campaign page at http://www.sel.noaa.gov/solcoord/solcoord.html.

For SOHO operations, see http://sohowww.nascom.nasa.gov/operations. For TRACE operations, see http://chippewa.nascom.nasa.gov/TRACE/ops/timeline/

GENERAL INFORMATION ABOUT Yohkoh

The SXT instrument is a grazing-incidence soft X-ray telescope. See Tsuneta et al., Solar Physics 136, 37 (1991) for details. The options for an observing setup consist of where we look, how often we take exposures, what resolution they are in, what filters and exposure times, etc, etc. All of this is traded off within a fixed telemetry budget and various other constraints. For certain special operations we'll list some of this information here if we can. Otherwise please contact the SXT chief observer for whatever details are needed. e-mail to the "campaign" account is forwarded to the SXT Chief Observer.

The World-Wide Web has more to offer regarding Yohkoh and SXT. See http://www.lmsal.com/SXT/homepage.html.

SXT Chief Observer plan (version of 01-Feb-98)

freeland@sxt1.lmsal.com
ypop@sag.lmsal.com