Center-to-limb variation of the peak flux spectra of type IV radio bursts associated with solar proton flares

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Type IV radio bursts with wide band from microwave to metric-wave frequency are generally associated with solar proton flares. Recently, Castelli et al. (1967, 1968) have shown that the type IV radio bursts associated with solar proton flares show the U-shaped peak flux spectra with the minimum flux at decimetric frequencies. In this paper, the center-to-limb variation of such peak flux spectra is investigated in order to examine the effect of decrease of the peak flux at metric frequencies with increase of the angular distance from the central meridian of the Sun. It is shown that the U-shaped spectra are obtained independent of the position of proton flares, although the spectral form changes significantly in the case of the flares near the limb. It is further suggested that the U-shaped spectra consist of the two essentially independent components for microwave and metric-wave frequencies, respectively. NAS-NRC Associate with NASA; Presently, NASA Associate at University of Maryland.

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