Microscopic decimetric radio fine structures associated with solar chromospheric irregularities in density

Details Microscopic decimetric radio fine structures associated with solar chromospheric irregularities in density Microscopic decimetric radio fine structures associated with solar chromospheric irregularities in density

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23q.177m&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 177-177

Astronomy and Astrophysics

Astronomy

Scientific paper

Brazilian Solar Spectroscope (BSS), operating in the frequency range of (1000-2500) MHz with high time and frequency resolutions for the last ten years, has observed various fine structures showing intensity variations as a function of time and frequency. Various types of plasma effects explain many of these fine structures. We have analysed a group of fine structures observed by BSS from August to October/2001 associated with decimetric type III bursts, showing variation of intensity as a function of frequency and curvatures in the time-frequency plane. In particular, decimetric type III bursts presented emission gaps over 50-100 MHz, and curvatures at the low frequency edge. These fine structures can be explained as a propagation effect. We suggest that these structures are the signatures of the chromospheric inhomogeneties lying in the line-of-sight path between the observer and the radio source. For the emitted frequencies lower than the plasma frequencies of the density inhomogeneties, there will be absorption over a certain band, corresponding to the dimension of the inhomogeneties. The curved like structures are due to the interaction of the waves with the medium. The waves are dispersed since each small range of frequencies travels at a slightly different velocity. Some of the obtained results for the dimensions of the irregularities are of the order of 102 103 km. The density excess of the inhomogeneties responsible for the curvatures at the low frequency edge is associated with propagation delays of the order of 300 ms.

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