Seasonal drift of the global thunderstorms and Schumann resonance frequencies

We discuss the impact of the seasonal north-south drift of the global thunderstorm centers on the results of observation of the first mode Schumann resonance (SR) frequency. We apply two models of the global thunderstorm distribution. The first is the model of a single compact lightning center. This center is positioned near the evening terminator and has the size of some tens of degrees. At the solstice period of the year, the center shifts southward (during the winter time in the Northern hemisphere) or northward (during the summer). Its diurnal trace coincides with the equator at equinox conditions. The second model is based on the concept of three global thunderstorm centers situated over Africa, Central America and South-East Asia. Seasonal drifts of the centers are pertinent to the model as well.