The polarization of second harmonic plasma emission

Details The polarization of second harmonic plasma emission The polarization of second harmonic plasma emission

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..315m&link_type=abstract

Astronomy and Astrophysics, vol. 66, no. 3, June 1978, p. 315-324. Research supported by the Aspen Center for Physics

Astronomy and Astrophysics

Astrophysics

28

Harmonic Radiation, Plasma Radiation, Polarized Electromagnetic Radiation, Electrostatic Waves, Lines Of Force, Magnetic Flux, Solar Corona, Type 3 Bursts

Scientific paper

It is shown that second-harmonic plasma emission is partially polarized in the sense of the ordinary mode of magnetoionic theory only when the Langmuir waves are confined to a small range of angles (less than 30 deg) to the magnetic-field lines. Consequently, Suzuki and Sheridan's (1977) observations of the polarization of harmonic Type III emission implies that (at least in the cases reported) the Langmuir waves must be nearly one-dimensional. For a nearly one-dimensional distribution, the degree of polarization and the frequency of observation should be related to the magnetic field. For the observed polarization of Type III bursts, the implied magnetic-field strengths are strong enough for induced scattering to cause the Langmuir waves to become nearly one-dimensional, which is consistent with the observed sense of polarization. In other applications of harmonic plasma emission where the Langmuir waves might be isotropic or in a loss-cone distribution, polarization in the sense of the extraordinary mode is predicted.

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