Solar noise storms in the decametric wavelength range

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Decametric Waves, Noise Storms, Solar Radio Bursts, Solar Storms, Spectroheliographs, Solar Activity, Solar Limb, Solar Spectra, Spatial Distribution, Type 3 Bursts

Scientific paper

High resolution dynamic spectra of decametric storm activity, obtained during 15 months with the Nancay spectrographs, are described. The decametric storms, which correspond to a Type I storm at higher frequencies, are characterized by a rapid succession of bursts: Type III bursts, Type IIIb bursts, drift pairs and fast drift storm bursts, differing from one storm to another. It is shown that the kind of bursts involved in a decametric storm depends on the longitude of the source. Type III storms with or without drift pair bursts correspond to active regions close to the central meridian, while Type IIIb storm centers are located closer to the limb. This center-to-limb variation of the nature of the storms might give a clue to the mechanism of emission of the fast decametric bursts.

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