Equatorial electrojet plasma irregularities observed during late afternoon by the 30 MHz coherent scatter radar in Sao Luis, Brazil

Autor(es)

Shume, E. B. ; de Paula, E. R. ; Kherani, E. A. ; Abdu, M. A. ; Denardini, C. M.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 73, n. 11-12, p. 8-pg., 2011-07-01.

Resumo

Coherent scatter radar observations conducted right before twilight by the 30 MHz radar in Sao Luis (Brazil) during both quiet (December 10, 2001) and disturbed (December 12, 2001) conditions detected type I echoes on the shoulders of broad type II spectra (near zero Doppler velocity). Zonal electric fields inferred from the Sao Luis ionosonde have a larger magnitude during the period where these spectral observations were made than on December 18, 2001 when type I echoes were not observed during late afternoon. The IMF B-z and AE index indicate that the extended geomagnetic disturbance in the afternoon of December 12, 2001 has allowed the interaction between disturbance dynamo and prompt penetration electric fields. The latter electric field component could have exceeded the former to give rise to the observed electric fields, and make possible observation of type I echoes. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

• 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
• Modalidade de apoio: 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
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 04/01065-0 - Imageamento das irregularidades ionosféricas por radar VHF
• Beneficiário: Eurico Rodrigues de Paula
• Modalidade de apoio: Auxílio à Pesquisa - Regular