Gradient pattern analysis of short solar radio bursts |
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Authors: | RR Rosa M Karlický TB Veronese NL Vijaykumar HS Sawant AI Borgazzi MS Dantas EBM Barbosa RA Sych O Mendes |
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Institution: | 1. Laboratório Associado de Computação e Matemática Aplicada (LAC), Instituto Nacional de Pesquisas Espaciais (INPE) São José dos Campos – São Paulo, Brazil;2. Astronomical Institute of Academy of Sciences of the Czech Republic, Ondrejov, Czech Republic;3. Divisão de Astrofísica (DAS) – INPE, Brazil;4. Divisão de Geofísica Espacial (DGE) – INPE, Brazil;5. Institute of Solar-Terrestrial Physics, Irkutsk, Russia |
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Abstract: | We analyze the weak component of the localized temporal pattern variability of 3 GHz solar burst observed by the Ondrejov radiospectrograph. A complex, short and weak impulsive sample from the time series was analyzed by applying a method based on the gradient pattern analysis and discrete wavelet decomposition. By analyzing canonical temporal variability patterns we show that the new method can reliably characterize the phenomenological dynamical process of short time series (N ? 103 measurements) as the radio burst addressed here. In the narrowest sense, by estimating the mutual information distance in the gradient spectra, we show that the fluctuation pattern of the short and weak 3 GHz impulsive solar burst, with energetic amplitudes <350 SFU, is closer to the intermittent and strong MHD turbulent variability pattern. |
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Keywords: | Solar radio bursts Stochastic processes Gradient pattern analysis Wavelets MHD turbulence |
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