Physics
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010soph..261..295a&link_type=abstract
Solar Physics, Volume 261, Issue 2, pp.295-309
Physics
1
Sun: Radio Emission, Fine Structure Of Radio Bursts
Scientific paper
This paper investigates one of the kinds of fine structure of solar decametric type II radio bursts in the form of drifting narrowband fibers. The appearance of such a structure is customarily explained by the features of the radio emission mechanism in the source, which is formed when the shock wave catches up the previously-generated coronal mass ejection. On the other hand, the characteristics of radio emission in the process of its propagation from the source to the observation point are affected by inhomogeneities in the corona. Hence it is of considerable interest to estimate the role of the propagation effects on the formation of fiber structures in radio bursts. Our calculations show that strong refraction effects (caustics) can give rise to narrowband structures in the dynamic spectrum, resembling in their characteristics the fibers observed.
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