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How Electron Beams Produce Continuous Coherent Plasma Emission by H. Che, M. Goldstein, P. Diamond, and R. Sagdeev

11 Apr 2017, 10:34 UTC
How Electron Beams Produce Continuous Coherent Plasma Emission  by H. Che, M. Goldstein, P. Diamond, and R. Sagdeev
(200 words excerpt, click title or image to see full post)

It is commonly accepted that energetic electron beams can produce drift frequency radio emission or Type III bursts since Ginzburg and Zhelezniakov first proposed the idea in 1958. However, the electron two-stream instability time (see reference 2) in the corona is fraction of a second, while the duration of coronal Type III bursts lasts several orders of magnitude longer. This problem is called the “Sturrock Dilemma” and remains a subject of active research for nearly 60 years.
Solar radio bursts can be produced by the interaction of a Langmuir wave and a wave whose frequency is thousands of times lower than that of Langmuir wave. The mechanism is as follows: In homogeneous plasma, all the electrons oscillate around the equilibrium. However, if a low frequency wave is superposed to the Langmuir wave, the plasma becomes inhomogeneous and the electrons would experience an additional force. This force drives the electric charges to separate further on a large scale and cause the energy of the Langmuir waves to be transferred to electrons from low electric potential energy states to high electric potential energy states (See Fig. 1). This process is unstable and the electrons eventually have to jump back to a low ...

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