Busca avançada
Ano de início
Entree
(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.)

Scintillation-producing Fresnel-scale irregularities associated with the regions of steepest TEC gradients adjacent to the equatorial ionization anomaly

Texto completo
Autor(es):
Muella, M. T. A. H. [1, 2] ; Kherani, E. A. [1] ; de Paula, E. R. [1] ; Cerruti, A. P. [2] ; Kintner, P. M. [2] ; Kantor, I. J. [1] ; Mitchell, C. N. [3] ; Batista, I. S. [1] ; Abdu, M. A. [1]
Número total de Autores: 9
Afiliação do(s) autor(es):
[1] Inst Nacl Pesquisas Espaciais, Div Aeron, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[2] Cornell Univ, Sch Elect & Comp Engn, Ithaca, NY 14853 - USA
[3] Univ Bath, Dept Elect & Elect Engn, Bath BA2 7AY, Avon - England
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF GEOPHYSICAL RESEARCH; v. 115, MAR 4 2010.
Citações Web of Science: 31
Resumo

Using ground-based GPS and digital ionosonde instruments, we have built up at latitudes of the equatorial ionization anomaly (EIA), in the Brazilian sector, a time-evolving picture of total electron content (TEC), L-band amplitude scintillations, and F region heights, and we have investigated likely reasons for the occurrence or suppression of equatorial scintillations during the disturbed period of 18-23 November 2003. During the prestorm quiet nights, scintillations are occurring postsunset, as expected; however, during the storm time period, their spatial-temporal characteristics and intensity modify significantly owing to the dramatic changes in the ionospheric plasma density distribution and in the temporal evolution of TEC. The two-dimensional maps showing both TEC and amplitude scintillations revealed strong evidence of turbulences at the Fresnel length (causing scintillations) concurrent with those regions of steepest TEC gradients adjacent to the crests of the EIA. The largest density gradients have been found to occur in an environment of increased background electron density, and their spatial distribution and location during the disturbed period may differ significantly from the magnetic quiet night pattern. However, in terms of magnitude the gradients at equatorial and low latitudes appear to not change during both magnetic quiet and disturbed conditions. The scenarios for the formation or suppression of scintillation-producing Fresnel-scale irregularities during the prestorm quiet nights and disturbed nights are discussed in view of different competing effects computed from numerical simulation techniques. (AU)

Processo FAPESP: 08/04892-5 - Estudo da dependência temporal e espacial entre as irregularidades do plasma e o conteúdo eletrônico total como fundamentos para o desenvolvimento de um modelo de cintilação ionosférica: investigação simultânea de radiotomografia ionosférica
Beneficiário:Marcio Tadeu de Assis Honorato Muella
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 07/00104-0 - Estudo experimental e teórico das irregularidades ionosféricas equatoriais
Beneficiário:Esfhan Alam Kherani
Linha de fomento: Bolsas no Brasil - Pós-Doutorado