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Spatially inhomogeneous acceleration of electrons in solar flares View all abstracts by submitter

Eduard Kontar   Submitted: 2018-01-16 07:54

The imaging spectroscopy capabilities of the Reuven Ramaty high energy solar spectroscopic imager (RHESSI) enable the examination of the accelerated electron distribution throughout a solar flare region. In particular, it has been revealed that the energisation of these particles takes place over a region of finite size, sometimes resolved by RHESSI observations. In this paper, we present, for the first time, a spatially distributed acceleration model and investigate the role of inhomogeneous acceleration on the observed X-ray emission properties. We have modelled transport explicitly examining scatter-free and diffusive transport within the acceleration region and compare with the analytic leaky-box solution. The results show the importance of including this spatial variation when modelling electron acceleration in solar flares. The presence of an inhomogeneous, extended acceleration region produces a spectral index that is, in most cases, different from the simple leaky-box prediction. In particular, it results in a generally softer spectral index than predicted by the leaky-box solution, for both scatter-free and diffusive transport, and thus should be taken into account when modelling stochastic acceleration in solar flares.

Authors: Duncan J. Stackhouse and Eduard P. Kontar
Projects: RHESSI

Publication Status: Accepted tp Astronomy and Astrophysics journal
Last Modified: 2018-01-16 11:10
Go to main E-Print page   Evolution of Photospheric Flow and Magnetic Fields Associated with The   2015 June 22 M6.5 Flare  Probing Twisted Magnetic Field Using Microwave Observations in an M Class Solar Flare on 11 February, 2014  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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