On the spectra of type-III solar radio bursts observed at low frequencies

Physics

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Low Frequencies, Radio Spectra, Type 3 Bursts, Energy Spectra, Ogo-5, Power Spectra, Radiant Flux Density, Spectrum Analysis

Scientific paper

The spectra of strong bursts observed at low frequencies by OGO-5 during 1968-1970 are presented. They usually exhibit an intense main peak between 100 kHz and 1 MHz, and sometimes a less intense secondary peak between 1 and 3.5 MHz. Main peaks of 10 to the -12th W per sq m per Hz or more were obtained in very strong events, but because of antenna calibration problems those could be one or two orders of magnitude too high. Recently published work supports the finding that type III bursts at low frequencies can be at least four orders of magnitude more intense than at ground-based frequencies of observation. It is found that the energy received at the earth increases with decreasing frequency approximately as f to the -n, where n is between 3 and 4.

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