| Texto completo | |
| Autor(es): |
de Abreu, A. J.
;
Correia, E.
;
de Jesus, R.
;
Venkatesh, K.
;
Macho, E. P.
;
Roberto, M.
;
Fagundes, P. R.
;
Gende, M.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 245, p. 13-pg., 2023-04-01. |
| Resumo | |
The first-time statistical response of the positive and negative ionospheric storms phases using Vertical Total Electron Content (VTEC) measurements during 70 geomagnetic storms at near high-and mid-latitudes regions in the Antarctic and Argentine/Chilean sectors in the Southern hemisphere are investigated. The study covers the years between 1999 and 2018 of solar cycles 23 and 24, using the Dst <= -100 nT as a criterion for all 70 storms selected. Significant features of solar cycle, seasonal and local time of ionospheric storms are showed. Our results indicate that the occurrence of geomagnetic storms follows a pattern of solar activity dependence, and also indicate a predominance of positive and positive-negative phases during autumn, winter, and spring at mid-latitudes and winter at near high-latitudes. Negative and negative-positive phases occur during all seasons at near high- and mid-latitudes. In addition, positive phases occur more frequently during the daytime while the negative phases occur predominantly in nighttime. There is also a predominance of positive and positive-negative phases simultaneously at near high-and mid-latitudes in the Antarctic and Argentine/Chilean sectors. The percentages of occurrence of positive and positive-negative phases are of 50% and 19%, respectively, at mid-latitude and 60% and 22%, respectively, at near high-latitudes. Negative and negative-positive phases are below 9% at both latitudes. (AU) | |
| Processo FAPESP: | 16/24970-7 - Programa de Pesquisa de Observação e Previsão da Cintilação (SPORT) |
| Beneficiário: | Mangalathayil Ali Abdu |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/05455-2 - Caracterização da dinâmica da ionosfera no setor da América do Sul e Antártica frente aos impactos do clima espacial |
| Beneficiário: | Emilia Correia |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |