Characterization of GPS total electron content (GPS-TEC) in Antarctica from 2004 to 2011

• Published in: Annals of Geophysics
• Main Authors: Emília Correia, Amanda Junqueira Paz, Mauricio A. Gende
• Format: Article in Journal/Newspaper
• Language: English
• Published: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 2013
• Subjects: Ionosphere; Total electron content; Seasonal variation; Solar cycle; Meteorology. Climatology; QC851-999; Geophysics. Cosmic physics; QC801-809; Antarctic; Ferraz; Antarc*; Antarctica
• Online Access: https://doi.org/10.4401/ag-6223; https://doaj.org/article/0bc31f48bef445678302a99c03a3dcab

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.