A model for the coherent emission of solar radio moving type IV bursts

Details A model for the coherent emission of solar radio moving type IV bursts A model for the coherent emission of solar radio moving type IV bursts

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cha%26a..28..404w&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 28, Issue 4, p. 404-411.

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

A theoretical model is proposed for interpreting the coherent emissionmechanism of solar radio moving type IV bursts. Energetic electrons produced in flares captured by an expanding and rising magnetic flux tube exhibit a beam-like distribution of velocities on the top of the flux tube. These excite beaming plasma instability and directly amplifies O-mode electromagnetic waves. The instability growth rate sensitively depends on the coronal plasma parameter, ƒpe/ƒce and the beam-temperature Tb. This can qualitatively explain the high brightness temperature and high degree of polarization as well as the broad spectrum observed in this type of solar radio bursts.

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