Are Soft X-ray Loop-top Sources Diffuse or Filamentary?

Details Are Soft X-ray Loop-top Sources Diffuse or Filamentary? Are Soft X-ray Loop-top Sources Diffuse or Filamentary?

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...122.109k&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

Solar flares observed in soft X-rays show distinct bright loop-top sources, which usually form before flare maximum, and can last for many hours. The loop-top sources are recognizable in the the flare images from Skylab and are commonly present in the Yohkoh/SXT flare observations.
High resolution observations of TRACE however cast doubts on the diffuse structure of these sources. It was suggested that their diffuse appearance comes from the insufficient angular resolution of previous instruments and in fact they are composed of multitude of filamentary loops.
However some TRACE observations of solar flares exhibit diffuse structures located above bright loops, which location corresponds well with the Yohkoh loop-top sources. Therefore we analyze flares simultaneously observed in EUV and X-rays to find clues supporting or contradicting the hypothesis of filamentary nature of bright loop-top sources.

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