Articles | Volume 37, issue 3
Ann. Geophys., 37, 273–288, 2019

Special issue: Vertical coupling in the atmosphere–ionosphere system

Ann. Geophys., 37, 273–288, 2019

Regular paper 06 May 2019

Regular paper | 06 May 2019

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

Christoph Jacobi et al.

Data sets

Radio occultation data UCAR

Short summary
Sporadic E (Es) layers in the Earth's ionosphere are produced by ion convergence due to vertical wind shear in the presence of a horizontal component of the Earth's magnetic field. We present analyses of the 6 h tidal signatures in ES occurrence rates derived from GPS radio observations. Times of maxima in ES agree well with those of negative wind shear obtained from radar observation. The global distribution of ES amplitudes agrees with wind shear amplitudes from numerical modeling.