Weekly Notes from the Yohkoh Soft
X-Ray Telescope (Week 46)
14-Nov-97 23:00 UT
Instrument Status
The Soft X-ray Telescope remains in fine working order.
After the super region AR 8100 rotated off the west limb, at least
two active regions emerged on the disk. But the flare activity was
seen in two returning regions AR 8103 and AR 8108. The latter region,
in particular, produced a long duration event on 14 November 1997.
The region is still growing.
A more detailed report of this week's activities is
available here.
Observation of the Week
A long duration event (LDE) occurred a day after we completed a CCD bakeout.
It was from AR 8100, which was already bright and active on its appearance
on the east limb. The following plot shows a GOES 1-8 A light curve for
the flare. Yohkoh data for the rising part have already been reformatted,
and more data covering the soft X-ray peak will be reformatted within a
few days. The hard X-ray intensity was not high.
(Click on the graph to see a larger, more visible, version.)
The event was quite eruptive. Click on the following figure to see
images extracted from the full disk images. The field of view is
440000 km square.
Click on the following figure to see the images taken during flare mode.
The indicated loop moved to the east (probably to higer altitudes) at
a decreasing speed: it is 180 km/s between the first and second frames,
but only 67 km/s between the third and fourth frames.
Further analysis of this event is ongoing.
Nariaki Nitta 14-Nov-97 (email nitta@isass0.solar.isas.ac.jp)