Geomagnetic Activity and Generation of TIDs

Geomagnetic activity at high latitudes is one of the sources of generation of traveling ionospheric disturbances (TIDs). We use high spatial and temporal resolution maps of total electron content (TEC) obtained with the ground-based global network of GNSS receivers to study the role of auroral electrojet activity in generation of TIDs. Detrended TEC time series are used in spectral analysis of TIDs with several methods that include the continuous wavelet transform and the Adaptive Fourier transform. We present results of analysis for events with different levels and types of geomagnetic activity (nearly quiet, isolated and recurrent non-storm substorms, and large geomagnetic storms) to deduce spectral characteristics of observed TIDs and their relationship to the auroral activity at different latitudes and local time sectors.