Tidal wind shear observed by meteor radar and comparison with sporadic E occurrence rates based on GPS radio occultation observations
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Published:2019-09-19
Issue:
Volume:17
Page:213-224
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ISSN:1684-9973
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Container-title:Advances in Radio Science
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language:en
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Short-container-title:Adv. Radio Sci.
Author:
Jacobi ChristophORCID, Arras Christina
Abstract
Abstract. We analyze tidal (diurnal, semidiurnal, terdiurnal, quarterdiurnal) phases
and related wind shear in the mesosphere/lower thermosphere as observed by
meteor radar over Collm (51.3∘ N, 13.0∘ E). The wind shear phases are
compared with those of sporadic E (Es) occurrence rates, which were
derived from GPS radio occultation signal-to-noise ratio (SNR) profiles
measured by the COSMIC/FORMOSAT-3 satellites. At middle latitudes Es are
mainly produced by wind shear, which, in the presence of a horizontal
component of the Earth's magnetic field, leads to ion convergence in the region
where the wind shear is negative. Consequently, we find good correspondence
between radar derived wind shear and Es phases for the semidiurnal,
terdiurnal, and quarterdiurnal tidal components. The diurnal tidal wind
shear, however, does not correspond to the Es diurnal signal.
Funder
Deutsche Forschungsgemeinschaft
Publisher
Copernicus GmbH
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