Computer Science
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001stin...0276318z&link_type=abstract
Technical Report, PB2002-105638; HUT-MET-36
Computer Science
Solar Flares, Modulation, Low Frequencies, Millimeter Waves, Fast Fourier Transformations, Pulse Modulation, Stellar Spectra, Solar Magnetic Field, Radio Telescopes, Radio Bursts
Scientific paper
Analysis of low-frequency (LF) fluctuations of solar flare emission at 22 and 37 GHz is performed. Four microwave bursts observed in Metsahovi Radio Observatory with the time resolution of 100 and 50 ms are investigated. To find time-frequency diagram for LF-pulsations the Wagner-Ville method is applied. The Wagner-Ville (WV) transform presents a time-lag Fourier-conjugate of a local correlation function of an analytical signal formed using the sample of the signal to be investigated. As a result the dynamic spectra of LF-fluctuations were obtained in the first time, which were interpreted in terms of eigen oscillations of coronal magnetic loops. We compared as an example the time-frequency diagrams for selected events obtained by WV-method and Fast Fourier transform (FFT).
Kislyakov Albert G.
Shkelev E. I.
Stepanov Alexander V.
Urpo Seppo
Zaitsev Valerii V.
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