Characterization of GPS total electron content (GPS-TEC) in Antarctica from 2004 to 2011
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Artigo
Date
2013
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Annals of Geophysics
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7
Authors
Correia E.
Junqueira Paz A.
Gende M.A.
Junqueira Paz A.
Gende M.A.
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Abstract
The vertical total electron content (VTEC) obtained from 2004 to 2011 at Comandante Ferraz Brazilian Antarctic Station (62.1°S, 58.4°W) is analyzed to study the mean diurnal, seasonal and annual variations. The maximum daytime VTEC had an annual variation that decreased from 2004 to 2008, and then starting to increase in 2009, which followed the variation of the solar activity. The daily VTEC shows good linear correlation with solar radiation intensity, which is also dependent on the solar zenithal angle. The mean diurnal VTEC shows a semiannual variation, with larger peaks in equinoxes for all years; no winter anomaly was observed, and in summer, there was no clear diurnal variation. The semiannual variation of the VTEC is also modulated by solar activity, with larger VTEC peaks when the solar activity was higher. © 2013 by the Istituto Nazionale di Geofisica e Vulcanologia. All rights reserved.