Stereoscopic electron spectroscopy of solar hard X-ray flares with a single spacecraft

Details Stereoscopic electron spectroscopy of solar hard X-ray flares with a single spacecraft Stereoscopic electron spectroscopy of solar hard X-ray flares with a single spacecraft

2006-11-06

arxiv.org/abs/astro-ph/0611170v1

Astrophys.J.653:L149-L152,2006

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures, accepted to Astrophysical Journal Letters

Scientific paper

10.1086/510586

Hard X-ray (HXR) spectroscopy is the most direct method of diagnosing energetic electrons in solar flares. Here we present a technique which allows us to use a single HXR spectrum to determine an effectively stereoscopic electron energy distribution. Considering the Sun's surface to act as a 'Compton mirror' allows us to look at emitting electrons also from behind the source, providing vital information on downward-propagating particles. Using this technique we determine simultaneously the electron spectra of downward and upward directed electrons for two solar flares observed by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI). The results reveal surprisingly near-isotropic electron distributions, which contrast strongly with the expectations from the standard model which invokes strong downward beaming, including collisional thick-target model.

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