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Artículo

Day-to-day variability of equatorial electrojet and its role on the day-to-day characteristics of the equatorial ionization anomaly over the Indian and Brazilian sectors

Venkatesh, K.; Fagundes, P. R.; Prasad, D. S. V. V. D.; Denardini, Clezio Marcos; De Abreu, A. J.; De Jesus, R.; Gende, Mauricio AlfredoIcon
Fecha de publicación: 10/2015
Editorial: Blackwell Publishing Ltd
Revista: Journal of Geophysical Research A: Space Physics
ISSN: 2169-9402
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

The equatorial electrojet (EEJ) is a narrow band of current flowing eastward at the ionospheric E region altitudes along the dayside dip equator. Mutually perpendicular electric and magnetic fields over the equator results in the formation of equatorial ionization anomaly (EIA), which in turn generates large electron density variabilities. Simultaneous study on the characteristics of EEJ and EIA is necessary to understand the role of EEJ on the EIA variabilities. This is helpful for the improved estimation of total electron content (TEC) and range delays required for satellite-based communication and navigation applications. Present study reports simultaneous variations of EEJ and GPS-TEC over Indian and Brazilian sectors to understand the role of EEJ on the day-to-day characteristics of the EIA. Magnetometer measurements during the low solar activity year 2004 are used to derive the EEJ values over the two different sectors. The characteristics of EIA are studied using two different chains of GPS receivers along the common meridian of 77E (India) and 45W (Brazil). The diurnal, seasonal, and day-to-day variations of EEJ and TEC are described simultaneously. Variations of EIA during different seasons are presented along with the variations of the EEJ in the two hemispheres. The role of EEJ variations on the characteristic features of the EIA such as the strength and temporal extent of the EIA crest has also been reported. Further, the time delay between the occurrences of the day maximum EEJ and the well-developed EIA is studied and corresponding results are presented in this paper.
Palabras clave: Electron Density Variability , Equatorial And Low-Latitude Ionosphere , Equatorial Electrojet (Eej) , Equatorial Ionization Anomaly (Eia)
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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/11336/53421
DOI: https://dx.doi.org/10.1002/2015JA021307
URL: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2015JA021307
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Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Citación
Venkatesh, K.; Fagundes, P. R.; Prasad, D. S. V. V. D.; Denardini, Clezio Marcos; De Abreu, A. J.; et al.; Day-to-day variability of equatorial electrojet and its role on the day-to-day characteristics of the equatorial ionization anomaly over the Indian and Brazilian sectors; Blackwell Publishing Ltd; Journal of Geophysical Research A: Space Physics; 120; 10; 10-2015; 9117-9131
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