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Turbulent cross-field transport of non-thermal electrons in coronal loops: theory and observations View all abstracts by submitter

Eduard Kontar   Submitted: 2012-02-01 15:17

Context. A fundamental problem in astrophysics is the interactionbetween magnetic turbulence and charged particles. It is now possibleto use Ramaty High Energy Solar Spectroscopic Imager (RHESSI)observations of hard X-rays (HXR) emitted by electrons to identify thepresence of turbulence and to estimate the magnitude of the magneticfield line diffusion coefficient at least in dense coronal flaringloops.
Aims: We discuss the various possible regimes of cross-field transportof non-thermal electrons resulting from broadband magnetic turbulencein coronal loops. The importance of the Kubo number K as a governingparameter is emphasized and results applicable in both the large andsmall Kubo number limits are collected.
Methods: Generic models, based on concepts and insights developed inthe statistical theory of transport, are applied to the coronal loopsand to the interpretation of hard X-ray imaging data in solar flares.The role of trapping effects, which become important in the non-linearregime of transport, is taken into account in the interpretation ofthe data.
Results: For this flaring solar loop, we constrain the ranges ofparallel and perpendicular correlation lengths of turbulent magneticfields and possible Kubo numbers. We show that a substantial amount ofmagnetic fluctuations with energy ~1% (or more) of the backgroundfield can be inferred from the measurements of the magnetic diffusioncoefficient inside thick-target coronal loops.

Authors: Bian, N. H.; Kontar, E. P.; MacKinnon, A. L.
Projects: RHESSI

Publication Status: published in Astronomy and Astrophysics
Last Modified: 2012-02-03 12:03
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