Spontaneous emission of Alfvénic fluctuations

Low-frequency fluctuations are pervasively observed in the solar wind. The present paper theoretically calculates the steady state spectra of low-frequency electromagnetic (EM) fluctuations of the Alfvénic type for thermal equilibrium plasma. The analysis is based upon a recently formulated theory o...

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Bibliographic Details
Published in:Plasma physics and controlled fusion 2017-09, Vol.59 (9), p.95002
Main Authors: Yoon, P H, López, R A, Vafin, S, Kim, S, Schlickeiser, R
Format: Article
Language:English
Subjects:
kinetic Alfvén
magnetosonic
spontaneous emission
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Summary:Low-frequency fluctuations are pervasively observed in the solar wind. The present paper theoretically calculates the steady state spectra of low-frequency electromagnetic (EM) fluctuations of the Alfvénic type for thermal equilibrium plasma. The analysis is based upon a recently formulated theory of spontaneously emitted EM fluctuations in magnetized thermal plasmas. It is found that the fluctuations in the magnetosonic mode branch is constant, while the kinetic Alfvénic mode spectrum is dependent on a form factor that is a function of perpendicular wave number. Potential applicability of the present work in the wider context of heliospheric research is also discussed.
ISSN:0741-3335
1361-6587
DOI:10.1088/1361-6587/aa77c3