The Nature of Decimeter-Wave Microburst Emission

Details The Nature of Decimeter-Wave Microburst Emission The Nature of Decimeter-Wave Microburst Emission

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005arep...49..144b&link_type=abstract

Astronomy Reports, vol. 49, Issue 2, p.144-154

Astronomy and Astrophysics

Astronomy

6

Scientific paper

New observations of solar microbursts are reported. The spectra of microbursts can contain narrow features (Δf/f ≤ 0.03). Possible mechanisms for the generation of the microburst radio emission are analyzed, focusing on mechanisms that preferentially generate ordinary waves. Together with the well-known generation of radio emission at the fundamental plasma frequency, mechanisms associated with upper-hybrid waves and resonant-transition radiation are considered. The radio emission at the upper-hybrid frequency always corresponds to ordinary waves. Ordinary waves can also dominate in resonant-transition radiation, but the presence of well-developed small-scale turbulence in the emission region is required. Possible mechanisms for the generation of this turbulence include thermal fluctuations, Langmuir turbulence, quasi-stationary structures created by plasmawaves, and ion-acoustic waves. Probable origins of the quasi-periodicity of microbursts are analyzed.

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