Spectral analysis of ionospheric electron density and mesospheric neutral wind diurnal nonmigrating tides observed by COSMIC and TIMED satellites

We use two-dimensional spectral analysis method to extract diurnal eastward zonal wavenumber 3 (E3) and westward zonal wavenumber 2 (W2) nonmigrating tide in the mesospheric winds from TIMED TIDI instrument and ionosphere density from the COSMIC six satellite cluster GPS data to study seasonal and inter-annual variations. In the case of the diurnal E3 component our results show that the ionospheric electron density feature has the same inter-annual variation trend as the symmetric mode of the mesospheric wind E3 component.

The mesospheric wind E3 antisymmetric mode has the opposite inter-annual trend and less influence on the ionosphere. The diurnal W2 component show less clear correlation between the mesosphere and the ionosphere. Quasi-Biennial Oscillation (QBO) influences on both the mesosphere and ionosphere are implied.