Numerical analysis of ionosphere disturbances and Schumann mode splitting in the Earth-ionosphere cavity

摘要

The variability of ionosphere properties plays an important role in the Schumann resonances (SR), amplitudes, frequencies, and Q factor. Therefore, as atmosphere ionization is related to solar activity, SR could be devised as a source of indirect parameters that locally from the surface of the Earth could provide space weather information. A proper understanding of this link to SR parameters can be obtained through finite difference time domain (FDTD) simulations, specifically with the numerically obtained modes and frequencies that relate frequency shifts to the day-night asymmetry and polar inhomogeneities. Day-Night asymmetry is observed to have a minor influence in SR; however, large changes are deduced from polar nonuniformities associated to Solar Proton Events (SPE) and X-ray bursts. The field volume distribution of the modes provides the understanding of the SR variability, related to the altitude and latitude of the ionization phenomenon.