Theoretical models for high-energy solar flare emissions

Details Theoretical models for high-energy solar flare emissions Theoretical models for high-energy solar flare emissions

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aipc..294...26r&link_type=abstract

High-energy solar phenomena-A new era of spacecraft measurements. AIP Conference Proceedings, Volume 294, pp. 26-44 (1994).

Physics

23

Scientific paper

We discuss gamma ray production mechanisms and ion transport processes in solar flares. We investigate the implications of the extended GeV gamma ray emission observed from the 11 June and 15 June 1991 flares. We find that this extended emission could be produced by ions trapped in loops, provided there is a suitable combination of size, twist, field convergence, and turbulent energy density. We also consider in some detail the possibility of continuous acceleration by Alfvén turbulence. We find that this would require the continuous presence of turbulence with energy density of at least 1 erg cm-3. The strong pitch angle scattering caused by this turbulence leads to anisotropic pion decay emission with much steeper spectrum than observed. We discuss various alternatives, including the possibility of episodal acceleration.

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