Issue |
A&A
Volume 562, February 2014
|
|
---|---|---|
Article Number | A57 | |
Number of page(s) | 11 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361/201322263 | |
Published online | 05 February 2014 |
Plasma radio emission from inhomogeneous collisional plasma of a flaring loop
1 Centre for Space, Fusion and Astrophysics, University of Warwick, CV4 7AL, UK
e-mail: h.ratcliffe@warwick.ac.uk
2 School of Physics & Astronomy, University of Glasgow, G12 8QQ, UK
Received: 11 July 2013
Accepted: 5 December 2013
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.
Key words: Sun: particle emission / Sun: radio radiation / Sun: flares
© ESO, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.