Solar Flare Impulsive-phase Footpoints in Extreme UV, Soft X-Rays and Hard X-Rays

Details Solar Flare Impulsive-phase Footpoints in Extreme UV, Soft X-Rays and Hard X-Rays Solar Flare Impulsive-phase Footpoints in Extreme UV, Soft X-Rays and Hard X-Rays

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..397..157b&link_type=abstract

First Results From Hinode ASP Conference Series, Vol. 397, Proceedings of the conference held 20-24 August, 2007, at Trinity Col

Astronomy and Astrophysics

Astronomy

Scientific paper

We examine the flare of 14 March 2002, which has early impulsive phase TRACE 171 Å channel EUV footpoints co-spatial with RHESSI foopoints at energies between 6 and 50 keV. Surprisingly, the HXR spectrum from these footpoint sources at this time is clearly thermal, consistent with plasma temperatures up to 30 MK. The evidence points to impulsive thermal footpoint emission, such as was observed previously with the Yohkoh Soft X-ray Telescope, implying that the upper chromosphere or transition region plasma is heated rapidly to temperatures of millions of degrees.

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