Periodicities in Fine Structure of Type IV Radio Solar Bursts

Details Periodicities in Fine Structure of Type IV Radio Solar Bursts Periodicities in Fine Structure of Type IV Radio Solar Bursts

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..848..243t&link_type=abstract

RECENT ADVANCES IN ASTRONOMY AND ASTROPHYSICS: 7th International Conference of the Hellenic Astronomical Society. AIP Conferenc

Astronomy and Astrophysics

Astrophysics

Radio Emission, Helioseismology, Pulsations, And Shock Waves, Solar Activity

Scientific paper

A study of periodicities appearing in the type-IV bursts fine structure (fibers and pulsations in particular) is presented. Our data set includes recordings by ARTEMIS IV with high time resolution; this facilitates the detection of lower than 1 sec periodicities. We introduce a method which employs directional filtering for the separation of intertwined fibers and pulsations for independent analysis of different events within complex radio bursts. For further analysis we use Short Time Fourier and Wavelet transforms which enable the study of the evolution of periodicities with time over specified periods of solar radio activity. Since, according to existing theoretical models, periodicities depend on basic parameters of active regions, this methodology provides the appropriate diagnostic tools.

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