Radio signatures of fast oscillatory phenomena in the solar corona

Details Radio signatures of fast oscillatory phenomena in the solar corona Radio signatures of fast oscillatory phenomena in the solar corona

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..619m&link_type=abstract

In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2

Physics

1

Solar Radio Bursts, Type Iv Bursts, Solar Radio Fine Structures, Radio Pulsations

Scientific paper

During type IV solar radio bursts different types of periodic fine structures (PFSs) are frequently observed, which can be interpreted as radio signatures of fast oscillatory phenomena in the coronal plasma. We analyze a large set of type IV bursts containing PFSs, recorded with high time resolution at single frequencies in the metric and decimetric bands. Focusing on the association with flares and flare-like phenomena we found: PFSs can be found in about 50% of type IV bursts characterized by fine structures; 10% of PFS-containing events are weak/short type IV-like radio bursts that occur in absence of any flare-like activity. In the weakest events the whole radio burst was in fact just one short PFS-episode recorded at only one observing frequency; In flare associated events we found two distinct classes of PFSs - impulsive phase and decay phase related PFSs; yet, no statistically significant difference in the characteristic periods and amplitudes is found between the two classes; PFS-rich radio events are characterized by large SXR and radio peak fluxes - neither one of the weak type IV bursts was PFS-rich. The opposite is not true: mainly powerful bursts are PFS-poor.

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