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. We analyze tidal (diurnal, semidiurnal, terdiurnal, quarterdiurnal) phasesand related wind shear in the mesosphere/lower thermosphere as observed bymeteor radar over Collm (51.3 ∘  N, 13.0 ∘  E). The wind shear phases arecompared with those of sporadic E (Es) occurrence rates, which werederived from GPS radio occultation signal-to-noise ratio (SNR) profilesmeasured by the COSMIC/FORMOSAT-3 satellites. At middle latitudes Es aremainly produced by wind shear, which, in the presence of a horizontalcomponent of the Earth's magnetic field, leads to ion convergence in the regionwhere the wind shear is negative. Consequently, we find good correspondencebetween radar derived wind shear and Es phases for the semidiurnal,terdiurnal, and quarterdiurnal tidal components. The diurnal tidal windshear, however, does not correspond to the Es diurnal signal.

Tidal wind shear observed by meteor radar and comparison with sporadic E occurrence rates based on GPS radio occultation observations