Polarization of fundamental type III radio bursts

Details Polarization of fundamental type III radio bursts Polarization of fundamental type III radio bursts

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...90..139w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 90, Jan. 1984, p. 139-159. NSF-supported research.

Physics

9

Polarization Characteristics, Solar Corona, Type 3 Bursts, Beam Plasma Amplifiers, Electromagnetic Scattering, Electron Beams, Ion Acoustic Waves, Mode Transformers, Plasma Frequencies, Polarized Electromagnetic Radiation, Radio Wave Refraction, Solar Electrons

Scientific paper

The fundamental of type III bursts is only partially polarized, yet all theory for emission near the plasma frequency predicts pure o-mode emission. It is argued that depolarization is inherent in the burst itself. The o-mode radiation is intensely scattered and mode-converted when it temporarily falls behind its own source and finds itself in the medium that is already disturbed by the electron beam. The predicted minimum polarization nearly equals the polarization of the harmonic, as observed. 'Spike polarization' is naturally explained by the earlier arrival of the scattered o-mode. Additional residual polarization depends on the refraction at the site of emission; larger beam velocities imply higher polarization, as observed, because a larger fraction of the radiation escapes without mode-conversion. The polarization at the frequencies where U-bursts reverse is of particular interest.

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