| Texto completo | |
| Autor(es): |
Kherani, E. Alam
;
de Paula, E. R.
;
Cueva, R. Y. C.
;
Camargo, L. A. P.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 75, p. 7-pg., 2012-02-01. |
| Resumo | |
Radar observations of nighttime irregular structures in the equatorial upper-E-valley region are presented. These structures are observed strictly during occurrences of an ascending irregular bottomtype or bottomside F layer, during or prior to the appearance of a high-rising F region plume and a momentarily intensification of E-region irregularities. The slope and the altitude coverage of these structures are proportional to the ascending rate of the irregular bottomtype/bottomside F layer and the altitude coverage of the plume respectively. These structures are found to consist of substructures separated in times suggesting the presence of quasi-periodic striations within these irregular structures. On the basis of occurrence statistics during October 2001-December 2008, the occurrence rate of these structures is found to be 3.5%, indicating the nature of rare occurrence of these structures over Soa Luis. Moreover, their occurrence remains confined to the maximum solar-flux period (2001-2003) and to the summer months (October-January). The presence of these structures is a manifestation of the vertical coupling of E and F regions owing to the ambient electric fields of the ionosphere and the fringe-field associated with the F region plume. (C) 2011 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 07/00104-0 - Estudo experimental e teorico das irregularidades ionosfericas equatoriais. |
| Beneficiário: | Esfhan Alam Kherani |
| 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 |