Early Results from the YOHKOH Soft X-ray Telescope

Details Early Results from the YOHKOH Soft X-ray Telescope Early Results from the YOHKOH Soft X-ray Telescope

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.2301b&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #23.01; Bulletin of the American Astronomical Society, Vol. 24, p.759

Computer Science

Sound

1

Scientific paper

The The Soft X-ray Telescope on the Yohkoh satellite, launched by Japan on August 30, 1992, has proved to be a resounding success. It is providing a wealth of new information and many surprises, both on flares and on the behavior of the solar corona. Performance of the telescope has met or exceed our most optimistic expectations and it appears to be in perfect focus. Unlike the Skylab instruments, the Yohkoh telescope is not limited by a finite supply of film, permitting long sequences of images to be made with relatively high time resolution. Repetition rates for a given exposure / filter combination are typically a few seconds per frame to a few minutes per frame, depending on the selected field size. Movies assembled from long exposure sequences have shown the corona to be even more dynamic than expected. Major re-structuring, involving large fractions of the visible corona, can take place in an hour or two. Smaller regions are even more dynamic, changing almost continuously. Movies, created from long exposure sequences, have demonstrated the fundamental importance of large-scale coronal loops in connecting widely separated regions such that activity in one region quickly affects the physical conditions at remote sites. The images also show that the majority of the loops have nearly constant cross sections along their lengths, rather than one that increases with height. Several X-class flares have been observed; the surprising result is that they do not appear to be very dynamic in soft X-rays. The flare kernels seem to consist of compact loop structures that brighten and then fade without changing size or shape. Bright points are not as prominent as in the Skylab images; a result of using a CCD (a linear detector) rather than film which has a logarithmic response. The other instruments on Yohkoh are producing equally exciting results; it seems clear that the Yohkoh mission will produce many major advances in our knowledge of the flare mechanism.

Affiliated with

Also associated with

No associations

Rating

Early Results from the YOHKOH Soft X-ray Telescope does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Early Results from the YOHKOH Soft X-ray Telescope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Early Results from the YOHKOH Soft X-ray Telescope will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1512459