VERY LOW FREQUENCY ENVELOPE SPECTRA OF SOLAR RADIO BURSTS.
Environmental research papers,
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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The nature of amplitude fluctuation in solar radio bursts was studied. The very low frequency envelope spectra of radio noise from the quiet sun is uniform which conforms theoretically to Gaussian noise, and experimentally to a laboratory noise source. Type I solar bursts are characterised by broad-band enhancement in the envelope spectra, while Types II and III solar bursts depict narrow band regions of high spectral intensity in the envelope spectra. Type IV bursts yield a uniform spectra with narrow bands of attenuation. An explanation of the above in the case of Types I, II and III solar bursts is attempted by considering space charge wave amplification in the solar corona and assuming that the stream velocity has a very low frequency modulation. Author