The Height of White-light Flare Continuum Formation

Details The Height of White-light Flare Continuum Formation The Height of White-light Flare Continuum Formation

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2211m&link_type=abstract

American Astronomical Society, SPD meeting #42, #22.11; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

White-light continuum and hard X-ray emission in flares have strong correlations in time and in horizontal position, but at present we do not have a clear idea about their height structures. On 24 February 2011 a white-light flare (SOL2011-02-24T07:35) was observed on the east limb, simultaneously by the Helioseismic Magnetic Imager (HMI) on the Solar Dynamics Observatory (SDO), and by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI). This observation gives us the opportunity to determine the heights of these emissions directly, limited only by the limb references for the two spacecraft, with almost no projection undertainty. HMI obtained clear images in the pseudo-continuum around 6173A, and RHESSI obtained hard X-ray images. For both data sets, the precision of centroid determination is of order 0.1 arc s. We believe that the position of the white-light limb, as a local reference, can also be understood at a corresponding level of accuracy for the two data sets. We report the results of this analysis and discuss our findings in terms of present models of particle acceleration and energy transport in the impulsive phase.

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