High Energy Spectroscopy of Solar Flares

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Scientific paper

Particle acceleration in the solar corona during flares can be studied either via emissions from particles trapped at the Sun (radio, x-ray, gamma-ray) or by direct measurement of accelerated particles that escape to interplanetary space. The observations are complementary: among other effects, the escaping particles can be re-processed by shock acceleration in the inner heliosphere, and the trapped particles can be re-processed by scattering in a flare loop. The ultimate goal is to understand the initial acceleration mechanism or mechanisms as well as these subsequent effects. I will focus on remote x-ray and gamma-ray observations, with particular emphasis on recent results from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) satellite. Continuum spectroscopy and imaging of electron bremsstrahlung can be used to deduce the spectrum and transport of accelerated electrons, while nuclear line spectroscopy and imaging constrains these characteristics for accelerated ions, and their composition as well. I will discuss the particular observables involved, how they are currently being used, and the potential for future progress.

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