A Superhot Flare Observed by YOHKOH

Details A Superhot Flare Observed by YOHKOH A Superhot Flare Observed by YOHKOH

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...484..927n&link_type=abstract

Astrophysical Journal v.484, p.927

Astronomy and Astrophysics

Astronomy

16

Plasmas, Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

We report the first solar flare for which direct X-ray imaging (with focusing optics) has shown the location of superhot (T ~ 30 MK) plasma. This flare consists of two separate loop structures. The smaller structure dominates the soft X-ray emission, but the longer structure develops with persistently higher temperatures, which overlaps with low-energy hard X-ray sources with very soft spectra. Using a two-temperature model, we describe how the soft X-ray images lead to the inference of superhot temperatures in the latter structure, as we combine three broadband measurements at slightly different effective wavelengths.

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