Temporal stability of induction vectors from Antarctic Peninsula, AIA INTERMAGNET observatory

Induction vectors represent geomagnetic transfer functions used in magnetotellurics and related passive electromagnetic sounding methods geophysics. They are obtained from the measurements of variation carry information on distribution local regional electric resistivity subsurface, which can be interpreted terms geology tectonics. The underlying concept their interpretation works properly if so-called far-field condition is fulfilled, i.e., certain assumptions geometry utilized natural source fields met. magnetotelluric practitioner expects problems regions where variations originate to a high extent ionospheric currents as sources. Due polar (or auroral) electrojets, this skepticism towards clearly applies latitudes, regions, auroral zones. In present study, investigation focuses typical for electrojet sources occur data Argentine Islands INTERMAGNET observatory (AIA) located at Ukrainian Antarctic Akademik Vernadsky station. one month AIA measured normal framework analysed stability over both period time, time resolution day allows detection changes originating signals instead subsurface distribution. outcomes compared corresponding ones two northern hemisphere stations belong International Monitor Auroral Geomagnetic Effects (IMAGE) network, Finland Poland. Results show that induction do not exhibit expected latitudes; very similar comparable but opposite latitude 50 degrees, corresponds geographically mid-latitudes Europe. A further outcome study some slight, occasional attributed increased activity because they correlated planetary diurnal Ap index.