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Title:
Semi-harmonic and intermittent solar decimetric spikes
Authors:
Fernandes, Francisco C. R.; Bolzan, Maurício J. A.; Rosa, Reinaldo R.; Dutra, José A. S. S.; Cecatto, José R.; Mészárosová, Hana; Sawant, Hanumant S.
Affiliation:
AA(Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba - UNIVAP, São José dos Campos, SP, Brazil ), AB(Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba - UNIVAP, São José dos Campos, SP, Brazil ), AC(Divisão de Astrofisica, Instituto Nacional de Pesquisas Espaciais - INPE, São José dos Campos, SP, Brazil ), AD(Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba - UNIVAP, São José dos Campos, SP, Brazil ), AE(Divisão de Astrofisica, Instituto Nacional de Pesquisas Espaciais - INPE, São José dos Campos, SP, Brazil ), AF(Ondrejov Observatory, Astronomical Institute Academy of Sciences of the Czech Republic Ondrejov, Czech Republic ), AG(Divisão de Astrofisica, Instituto Nacional de Pesquisas Espaciais - INPE, São José dos Campos, SP, Brazil )
Publication:
Solar and Stellar Variability: Impact on Earth and Planets, Proceedings of the International Astronomical Union, IAU Symposium, Volume 264, p. 81-83
Publication Date:
02/2010
Origin:
CUP
Keywords:
Sun: activity, radio radiation, decimetric spikes, instrumentation: spectrographs
DOI:
10.1017/S1743921309992420
Bibliographic Code:
2010IAUS..264...81F

Abstract

We present the analysis of the narrowband solar radio spike emissions observed by the Brazilian Solar Spectroscope (BSS) on 24 June, 1999, at 16:53:55-16:56:48 UT. The data were recorded with temporal resolution of 50 ms and frequency resolution of 5 MHz. The dynamic spectra of clusters of spikes were recorded in 100 channels in the 1.2-1.7 GHz frequency band. The groups of radio spikes observed clearly show spectral semi-harmonic structures and an intermittent temporal patter. The observational parameters were determined from the dynamic spectra analysis. The wavelet analysis technique able us to determine the temporal cadence for the clusters. The frequency ratio between two clusters of spikes recorded at same time were inferred. The preliminary results show average cadence of clusters of spikes occurrence of about 32 seconds and a semi-harmonic average frequency ratio of the order of 1:1.2.

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