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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 1
Ann. Geophys., 22, 15–23, 2004
https://doi.org/10.5194/angeo-22-15-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 15–23, 2004
https://doi.org/10.5194/angeo-22-15-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Jan 2004

01 Jan 2004

Generation of large-scale equatorial F-region plasma depletions during lowrange spread-F season

Y. Sahai1, P. R. Fagundes1, J. R. Abalde1, A. A. Pimenta2, J. A. Bittencourt2, Y. Otsuka3, and V. H. Rios4 Y. Sahai et al.
  • 1Universidade do Vale do Paraiba (IPD), Av. Shishima Hifumi 2911,12244-000 S. J. Campos, SP, Brazil
  • 2Instituto Nacional de Pesquisas Espaciais, Av. dos Astronautas 1758, 12227-010 S. J. Campos, SP, Brazil
  • 3STELAB, Nagoya University, 3-13 Honohara, Toyokawa 442-8507, Japan
  • 4Physics Department, University of Tucuman, Av. Independencia 1800, 4000 San Miguel de Tucuman, Argentina

Abstract. All-sky imaging observations of the F-region OI 630nm nightglow emission allow us to visualize large-scale equatorial plasma depletions, generally known as trans-equatorial plasma bubbles. Strong range type spread-F is the radio signature of these (magnetically) north-south aligned plasma depletions. An extensive database of the OI 630nm emission all-sky imaging observations has been obtained at Cachoeira Paulista (22.7°S, 45.0°W; dip latitude ∼16°S), Brazil, between the years 1987 and 2000. An analysis of these observations revealed that relatively few large-scale ionospheric plasma depletions occur during the months of May to August (southern winter, June solstice) in the Brazilian sector. Of the few that are observed during these months, some occur in association with geomagnetic storms and some do not. In this paper, a detailed analysis of the events when large-scale ionospheric plasma depletions were initiated and evolved during the June solstice periods are presented and discussed.

Key words. Atmospheric composition and chemistry (airglow and aurora). Ionosphere (equatorial ionosphere; ionospheric irregularities)

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