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Artículo

Quasi-biennial oscillation in foF2 at the south crest of the equatorial anomaly

Mansilla, Gustavo AdolfoIcon ; Fernández de Campra, Patricia; Zossi Artigas, Marta MariaIcon
Fecha de publicación: 12/2009
Editorial: Elsevier
Revista: Journal of Atmospheric and Solar-Terrestrial Physics
ISSN: 1364-6826
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

The aim of this paper is to report some periodicities observed in the ionospheric parameter foF2 measured at Tucuman (26.9°S; 65.4°W), station placed near the southern crest of the equatorial anomaly. For that, monthly medians of foF2 at several hours of LT for the period 1958–1987 are used. The data are run with Fast Fourier Transform (FFT). Data gaps (∼4–5 months) are filled by means of linear interpolation. Several periodicities are present. Besides the solar cycle dominant dependence (∼11 years), semi-annual, annual, five years and quasi-biennial periodicities are also observed. A marked quasi-biennial periodicity is observed at daytime and nighttime hours being their greater amplitude at local noon and midnight. Different mechanisms or combined effects possibly cause them. It is suggested that the solar activity by means of extreme ultraviolet radiation (EUV), which present a quasi-biennial oscillation (QBO) and it is responsible for the ionization, could be the dominant mechanism for the diurnal quasi-biennial periodicity of foF2. At night, since the photoionization by extreme ultraviolet radiation is not significant and the F2 layer is lower than during daytime (∼100 km) other mechanism may be operative for the quasi-biennial periodicity observed. Possibly the stratospheric QBO contributes to the modulation of the observed behaviour in foF2 at night. This result is preliminary because it needs to be extended to other stations so as to extract definite conclusions. Moreover, we cannot dismiss the possibility of a combined effect of both these mechanisms mainly at daytime and/or QBO influence of geomagnetic parameters.
Palabras clave: Ionosphere , Equatorial Anomaly , Quasi-Biennial Oscillation
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/76693
DOI: https://dx.doi.org/10.1016/j.jastp.2009.03.003
URL: https://www.sciencedirect.com/science/article/pii/S1364682609000510?via%3Dihub
Colecciones
Articulos(CCT - NOA SUR)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - NOA SUR
Citación
Mansilla, Gustavo Adolfo; Fernández de Campra, Patricia; Zossi Artigas, Marta Maria; Quasi-biennial oscillation in foF2 at the south crest of the equatorial anomaly; Elsevier; Journal of Atmospheric and Solar-Terrestrial Physics; 71; 14-15; 12-2009; 1610-1612
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