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High Resolution Studies of Type III Solar Radio Bursts

  • C. Chiuderi (a1), R. Giachetti (a1), C. Mercier (a2), H. Rosenberg (a3) and C. Slottje (a3)...

Abstract

(Solar Phys.). High spectral, temporal and spatial resolution observations were obtained with the 60-channel Utrecht solar radio spectrograph (160–320 MHz) and the 169 MHz Nançay solar radioheliograph. From a large number of type III bursts the average height was found to be 0.37 solar radius above the photosphere, corresponding to approximately the Newkirk streamer density, if the bursts are emitted at the harmonic of the local plasma frequency. No center-to-limb variation, nor east-west asymmetry was observed. All double bursts, double humped bursts, precursor-type III had exactly the same position and general shape for both members of the pair. From this it was concluded that fundamental-harmonic pairs are very rare at frequencies above 160 MHz (Mercier and Rosenberg, 1974).

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Copyright

References

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Chiuderi, C., Giachetti, R., and Rosenberg, H.: 1974, to be published.
Mercier, C. and Rosenberg, H.: 1974, to be published.
Rosenberg, H.: 1973, , Utrecht.
Slottje, C.: 1974, Astron. Astrophys. 32, 107.

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