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Semi-harmonic and intermittent solar decimetric spikes

Published online by Cambridge University Press:  26 February 2010

Francisco C. R. Fernandes
Affiliation:
Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba - UNIVAP, São José dos Campos, SP, Brazil email: guga@univap.br
Maurício J. A. Bolzan
Affiliation:
Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba - UNIVAP, São José dos Campos, SP, Brazil email: guga@univap.br
Reinaldo R. Rosa
Affiliation:
Divisão de Astrofisica, Instituto Nacional de Pesquisas Espaciais - INPE, São José dos Campos, SP, Brazil email: reinaldo@lac.inpe.br
José A. S. S. Dutra
Affiliation:
Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba - UNIVAP, São José dos Campos, SP, Brazil email: guga@univap.br
José R. Cecatto
Affiliation:
Divisão de Astrofisica, Instituto Nacional de Pesquisas Espaciais - INPE, São José dos Campos, SP, Brazil email: reinaldo@lac.inpe.br
Hana Mészárosová
Affiliation:
Ondrejov Observatory, Astronomical Institute Academy of Sciences of the Czech Republic Ondrejov, Czech Republic email: hana@asu.cas.cz
Hanumant S. Sawant
Affiliation:
Divisão de Astrofisica, Instituto Nacional de Pesquisas Espaciais - INPE, São José dos Campos, SP, Brazil email: reinaldo@lac.inpe.br
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Abstract

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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

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