Weekly Notes from the Yohkoh Soft
X-Ray Telescope
(Week 8, 1998)
21-Feb-98 05:00 UT
Instrument Status
The SXT instrument continued to operate without problems.
A bakeout of the camera CCD was performed on Wednesday and Thursday.
See the weekly operations report
for details.
The GOES time series for the week:
In the display above (click to enlarge), the colored lines show the
times of SXT images that currently are on-line at ISAS.
The purple lines are flare mode.
Alas, the scale is too compressed here to be able to see individual data!
Most of the gaps will be filled in when the NASA telemetry arrives.
For a summary index listing of the weekly science reports, click
here.
Science nugget: Refinement of Eclipse Planning
This week we continued planning our observations for the upcoming
solar eclipse. SXT
is currently planning on making a series of quarter-resolution (256x256)
full-sun images in the AlMg filter. The selection of only one filter
for the sequence and the reduction of resolution to 256x256, allow
for a faster cadence of images; we should get one full-sun image every
32 seconds. If a suitable active region is expected to lie along the
edge of the moon's apparent path across the Sun, we also plan to
make a sequence of fast-cadence partial-sun images, in the hopes of
getting images of grazing occultation of the active region.
The rapid motion of Yohkoh makes it whiz in and
out of eclipse
several times, as shown in the plots below.
Please refer to the planning page for further
details, and we will present a view of the real thing in our notes for Week 9.
David McKenzie and Hugh Hudson, 21-Feb-97
(email mckenzie@isass0.solar.isas.ac.jp, hudson@isass0.solar.isas.ac.jp)
