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. The GPS radio occultation (RO) technique is used to studysporadic E (Es) layer plasma irregularities of the Earth's ionosphere on aglobal scale using GPS signal-to-noise ratio (SNR) profiles from theCOSMIC/FORMOSAT-3 satellite. The maximum deviation from the mean SNR can beattributed to the height of the Es layer. Es are generally accepted to beproduced by ion convergence due to vertical wind shear in the presence of ahorizontal component of the Earth's magnetic field, while the wind shear isprovided mainly by the solar tides. Here we present analyses ofquarterdiurnal tide (QDT) signatures in Es occurrence rates. From a localcomparison with mesosphere/lower thermosphere wind shear obtained with ameteor radar at Collm (51.3 ∘  N, 13.0 ∘  E), we find that thephases of the QDT in Es agree well with those of negative vertical shear ofthe zonal wind for all seasons except for summer, when the QDT amplitudes aresmall. We also compare the global QDT Es signal with numerical model results.The global distribution of the Es occurrence rates qualitatively agrees withthe modeled zonal wind shears. The results indicate that zonal wind shear isindeed an important driving mechanism for the QDT seen in Es.

Quarterdiurnal signature in sporadic E occurrence rates and comparison with neutral wind shear