Critical Fluctuations in Beam-Plasma Systems and Solar Type III Radio Bursts

It is shown that the Langmuir waves are excited similar to critical fluctuations during phase transitions when the negative absorption due to electron beam traveling radially outward in the solar atmosphere is balanced by the positive absorption due to collisions in the corona and due to scattering...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-01, Vol.900 (1), p.12019
Main Authors: Thejappa, G., MacDowall, R. J.
Format: Article
Language:English
Subjects:
Absorption
Astrophysics
Electron beams
Electron density
Inhomogeneity
Interplanetary medium
Langmuir waves
Phase transitions
Physics
Radio bursts
Rayleigh scattering
Solar atmosphere
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Summary:It is shown that the Langmuir waves are excited similar to critical fluctuations during phase transitions when the negative absorption due to electron beam traveling radially outward in the solar atmosphere is balanced by the positive absorption due to collisions in the corona and due to scattering on electron density inhomogeneities in the interplanetary medium. The effective temperature of the Langmuir fluctuations range from 1011 to 1013 K, explaining the majority of the type III bursts. The Rayleigh scattering and direct coupling due to density gradient as well as due to density inhomogeneities are discussed in the context of fundamental radiation and the combination scattering for second harmonic. The number density of electrons in type III beams is estimated and compared with observations. It is also shown that the stabilization of type III beams is achieved automatically since the instability does not develop in the case of critical fluctuations.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/900/1/012019