Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...90..689s&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 90, no. 2, p. 689-691
Astronomy and Astrophysics
Astrophysics
18
Beam Interactions, Chromosphere, Decimeter Waves, Type 3 Bursts, Wave-Particle Interactions, Electron Beams, Flux Density, Gamma Ray Observatory, Particle Acceleration
Scientific paper
A decimetric (1600 +/- 100 MHz), high-sensitivity digital spectroscope has been put into regular operation at Sao Jose dos Campos, Brazil, since 1991 March. The dynamic spectra are recorded on 35 mm film while 20 frequencies each separated by 10 MHz are digitized with time resolution of 100 ms. So far, about 350 groups of solar bursts have been observed by this system. These have been classified as microwave type and decimetric reverse slope (RS) type III bursts. Here, we report statistical investigations of the properties of the 44 moderately strong groups of decimetric type III-RS bursts. The average total duration of these bursts is approximately 0.7 s, the drift rate varied between approximately 400 and 3000 MHz/s, and average decay time is approximately 120 ms. These observed drifts and timescales suggest that decimetric type III-RS bursts are generated by beam plasma interaction at second harmonic in the inhomogeneous chromosphere, and that the acceleration region is located at a density level of less than or equal to 109/cu cm.
Fernandes Francisco Carlos Rocha
Neri Jose Angelo C. F.
Sawant Hanumant S.
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