Plasma radio emission from inhomogeneous collisional plasma of a flaring loop

Ratcliffe, H. and Kontar, E.P. (2014) Plasma radio emission from inhomogeneous collisional plasma of a flaring loop. Astronomy and Astrophysics, 562, A57. (doi:10.1051/0004-6361/201322263)

Ratcliffe, H. and Kontar, E.P. (2014) Plasma radio emission from inhomogeneous collisional plasma of a flaring loop. Astronomy and Astrophysics, 562, A57. (doi:10.1051/0004-6361/201322263)

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Publisher's URL: http://dx.doi.org/10.1051/0004-6361/201322263

Abstract

The evolution of a solar flare accelerated non-thermal electron population and associated plasma emission is considered in collisional inhomogeneous plasma. Non-thermal electrons collisionally evolve to become unstable and generate Langmuir waves, which may lead to intense radio emission. We self-consistently simulated the collisional relaxation of electrons, wave-particle interactions, and non-linear Langmuir wave evolution in plasma with density fluctuations. Additionally, we simulated the scattering, decay, and coalescence of the Langmuir waves which produce radio emission at the fundamental or the harmonic of the plasma frequency, using an angle-averaged emission model. Long-wavelength density fluctuations, such as are observed in the corona, are seen to strongly suppress the levels of radio emission, meaning that a high level of Langmuir waves can be present without visible radio emission. Additionally, in homogeneous plasma, the emission shows time and frequency variations that could be smoothed out by density inhomogeneities.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kontar, Dr Eduard and Ratcliffe, Miss Heather
Authors: Ratcliffe, H., and Kontar, E.P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Astronomy and Astrophysics
Publisher:EDP Sciences
ISSN:0004-6361
ISSN (Online):1432-0746
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
542081Rolling Programme in Solar and Plasma AstrophysicsLyndsay FletcherScience & Technologies Facilities Council (STFC)ST/I001808/1P&A - PHYSICS & ASTRONOMY