Soft X-ray observations of helmet structures from SXT: YOHKOH

Details Soft X-ray observations of helmet structures from SXT: YOHKOH Soft X-ray observations of helmet structures from SXT: YOHKOH

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ssrv...70..273c&link_type=abstract

Space Science Reviews, Volume 70, Issue 1-2, pp. 273-278

Physics

5

Solar, X-Ray, Helmet Structure

Scientific paper

We present soft X-ray observations of helmet structures in solar active regions obtained from SXT/Yohkoh. These helmet structures are observed to form in the flare decay phase and to be associated with active region loop interactions. Their morphology is similar to the much larger scale helmet streamers that appear in the outer corona as shown in optical images of solar eclipse. The observed X-ray helmet structures appear to be in quasi-equilibrium with lifetimes greater than the MHD time scale. Using the filter ratio method for the X-ray observations, we find that the cusp region has lower temperature and higher density than that in the stalk region above it. The plasma pressure in the cusp region is about the same or slightly higher than that in the stalk region.

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