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Semi-harmonic and intermittent solar decimetric spikes

Published online by Cambridge University Press:  26 February 2010

Francisco C. R. Fernandes ,
Maurício J. A. Bolzan ,
Reinaldo R. Rosa ,
José A. S. S. Dutra ,
José R. Cecatto ,
Hana Mészárosová  and
Hanumant S. Sawant
Francisco C. R. Fernandes
Affiliation:
Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba - UNIVAP, São José dos Campos, SP, Brazil email: [email protected]
Maurício J. A. Bolzan
Affiliation:
Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba - UNIVAP, São José dos Campos, SP, Brazil email: [email protected]
Reinaldo R. Rosa
Affiliation:
Divisão de Astrofisica, Instituto Nacional de Pesquisas Espaciais - INPE, São José dos Campos, SP, Brazil email: [email protected]
José A. S. S. Dutra
Affiliation:
Instituto de Pesquisa e Desenvolvimento, Universidade do Vale do Paraiba - UNIVAP, São José dos Campos, SP, Brazil email: [email protected]
José R. Cecatto
Affiliation:
Divisão de Astrofisica, Instituto Nacional de Pesquisas Espaciais - INPE, São José dos Campos, SP, Brazil email: [email protected]
Hana Mészárosová
Affiliation:
Ondrejov Observatory, Astronomical Institute Academy of Sciences of the Czech Republic Ondrejov, Czech Republic email: [email protected]
Hanumant S. Sawant
Affiliation:
Divisão de Astrofisica, Instituto Nacional de Pesquisas Espaciais - INPE, São José dos Campos, SP, Brazil email: [email protected]
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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.

Keywords

Sun: activityradio radiationdecimetric spikesinstrumentation: spectrographs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S264: Solar and Stellar Variability: Impact on Earth and Planets , August 2009 , pp. 81 - 83
Copyright
Copyright © International Astronomical Union 2010

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