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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Modulation of equatorial electrojet plasma waves by overshielding electric field during geomagnetic storms

Texto completo
Autor(es):
Shume, E. B. [1] ; de Paula, E. R. [1] ; Abdu, M. A. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Natl Inst Space Res, BR-12227010 Sao Jose Dos Campos - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF GEOPHYSICAL RESEARCH; v. 116, AUG 5 2011.
Citações Web of Science: 8
Resumo

This brief report presents daytime 30 MHz radar observations of equatorial electrojet plasma irregularities in Sao Luis, Brazil, during the 10 January 2002, 4 September 2002, and 6 November 2001 geomagnetic storms. Modulation of equatorial electrojet plasma waves by the overshielding electric field is detected by the radar during the January and September storm events. The depressions of radar echo intensity observed by the Sao Luis radar during the 10 January and 4 September 2002 storms are caused by inhibition of large-, medium-, and short-scale electrojet plasma waves by the overshielding electric field. Corresponding to the depressions of the radar echoes, counter equatorial electrojets were observed by ground-based magnetometer in Sao Luis. The influences of disturbance dynamo, undershielding, and overshielding electric fields on the equatorial electrojet irregularities and current have been evident on the 6 November 2001 radar and magnetic field data. This study demonstrates the control of the equatorial electrojet plasma waves (growth and suppression) by the interplanetary magnetic field and also the coupling between the high-latitude and equatorial ionospheres. (AU)

Processo FAPESP: 04/01065-0 - Imageamento das irregularidades ionosféricas por radar VHF
Beneficiário:Eurico Rodrigues de Paula
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 07/08185-9 - Investigação das irregularidades do plasma do eletrojato equatorial e do eco de 150 km no setor brasileiro utilizando multi-instrumentos e modelagem
Beneficiário:Esayas Belay Shume
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 99/00026-0 - Estudos das irregularidades ionosféricas utilizando radar HF/VHF/ de espalhamento coerente
Beneficiário:Eurico Rodrigues de Paula
Linha de fomento: Auxílio à Pesquisa - Regular