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Quasi-biennial oscillation in GPS VTEC measurements
Authors:Laura I Fernández  Amalia M Meza  Ana G Elías
Institution:1. Facultad de Cs. Astronómicas y Geofísicas, Universidad Nacional de La Plata, Av. Centenario e/ Av. Iraola y calle 120, 1900FWA La Plata, Buenos Aires, Argentina;2. Dpto. de Física, Facultad de Cs. Exactas y Tecnología, Universidad Nacional de Tucumán, Av. Independencia 1800, 4000 Tucumán, Argentina;3. Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Argentina
Abstract:The quasi-biennial oscillation, QBO, a well known periodicity in the equatorial stratospheric zonal winds, is also found in ionospheric parameters and in solar and geomagnetic activity indices. Many authors speculated about the link between the QBO in solar and geomagnetic activity and the QBO in atmospheric parameters. In this work we analyze the presence of the QBO in the ionosphere using the Vertical Total Electron Content (VTEC) values obtained from Global Navigation Satellite System (GNSS) measurements during the period 1999–2012. In particular, we used IONEX files, i.e. the International GNSS Service (IGS) ionospheric products. IONEX provide VTEC values around the world at 2-h intervals. From these data we compute global and zonal averages of VTEC at different local times at mid and equatorial geomagnetic latitudes. VTEC and Extreme Ultra Violet (EUV) solar flux time series are analyzed using a wavelet multi resolution analysis. In all cases the QBO is detected among other expected periodicities.
Keywords:Quasi biennial oscillation  Wavelet  Global IGS VTEC maps
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