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Bespalov, V. I.; Kolbaenkova, I. I.; Shtein, M. M.

doi:10.1023/a:1020100403548

Cited by 1 publication

(1 citation statement)

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“…The typical feature of the self-consistent expansion of energetic electrons is the formation of a turbulent "wall" on its front. Due to strong diffusion, the initial anisotropy therefore reduces rapidly and excited plasma waves have a much lower phase velocity than a particle's average velocity V (Bespalov & Trakhtengerts 1974):…”

Section: "Wall" Due To Langmuir Wave Turbulence?mentioning

confidence: 99%

Turbulent propagation of high-energy electrons in a solar coronal loop

Stepanov

Yokoyama

Shibasaki

et al. 2007

A&A

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Aims. We study the solar flare on 28 August 1999 observed by the Nobeyama Radioheliograph at 17 and 34 GHz and analyze the unusual behavior of microwave source (a coronal loop) after injections of high-energy electrons. The observations reveal a propagation velocity of the emission front along the loop of about 10 4 km s −1 , which is 30 times less than the velocity of high-energy electrons generating gyrosynchrotron emission at 17 and 34 GHz. The main goal is to understand the physical origin of this electron propagation. Methods. We interpret this anomalous propagation in terms of the collective effects of relativistic electrons interacting with plasma turbulence. A cloud of highly energetic electrons responsible for microwave emission generates low-frequency whistler waves, and a turbulent "wall" in the loop is formed. Results. The electrons undergo strong resonant scattering due to wave-particle interaction, and the emission front propagates with the wave phase velocity, which is much lower than the particle velocity.

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Section: "Wall" Due To Langmuir Wave Turbulence?mentioning

confidence: 99%