Solar noise storms - The polarization of storm Type III and related bursts

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Noise Storms, Polarization Characteristics, Solar Radio Bursts, Solar Storms, Type 3 Bursts, Circular Polarization, Continuous Spectra, Solar Radio Emission, Solar Spectra

Scientific paper

The spectral and polarization characteristics of 19 noise storms that occurred during 1976-1982 are reported. All components of the storms - Type I bursts and continuum, storm Type III bursts, and fine structures such as reverse drift pairs - are found to have the same sense of circular polarization. While the degree of polarization p of Type I bursts and continuum is generally greater than or approximately equal to 0.5, that of storm Type III bursts is almost always less than 0.5. Two set of storm Type III bursts stand out: one with less than or approximately equal to 0.2 and another with greater than or approximately equal to 0.3. Because these sets respectively have degrees of polarization so similar to those of fundamental (F) the harmonic (H) components of non-storm F - H pairs, it is deduced that storm Type III bursts are due sometimes to fundamental plasma radiation and sometimes to harmonic. However, F - H pairs are extremely rare among storm Type III bursts.

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