A test for large-angle radio scattering in the solar corona

Details A test for large-angle radio scattering in the solar corona A test for large-angle radio scattering in the solar corona

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...159...40w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 159, no. 1-2, April 1986, p. 40-48. NSF-CNR-supported research.

Physics

16

Polarization Characteristics, Radio Scattering, Solar Corona, Solar Radio Bursts, Circular Polarization, Polarized Radiation, Solar Physics, Solar Radiation Shielding, Stellar Models

Scientific paper

A significant fraction of all solar type-I radio bursts are only partially or negligibly polarized. The polarization during such bursts is shown to remain so constant that the delay during coronal propagation of one circularly polarized mode relative to the other is at most 4 milliseconds. This leads to the deductions (1) that the radiation is emitted fully polarized, because partially polarized emission anywhere near the plasma level would yield vastly longer delays, and (2) that the depolarization occurs by large-angle scattering at least as high in the corona as the harmonic level. Any roughly isotropic scattering is excluded, because it cannot yield bursts of sufficiently constant polarization. One model of highly directional scattering in which the radiation is 'reflected' by the magnetic field, much like from a half-silvered mirror, is discussed. Bursts within a group arise from a single source.

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