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Numerical simulation of the 6 day wave effects on the ionosphere: Dynamo modulation
Author(s) -
Gan Quan,
Wang Wenbing,
Yue Jia,
Liu Hanli,
Chang Loren C.,
Zhang Shaodong,
Burns Alan,
Du Jian
Publication year - 2016
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2016ja022907
Subject(s) - thermosphere , dynamo , ionosphere , physics , atmospheric sciences , atmospheric tide , geophysics , oscillation (cell signaling) , wavenumber , magnetic field , optics , quantum mechanics , biology , genetics
The Thermosphere‐Ionosphere‐Mesosphere Electrodynamics General Circulation Model (TIME‐GCM) is used to theoretically study the 6 day wave effects on the ionosphere. By introducing a 6 day perturbation with zonal wave number 1 at the model lower boundary, the TIME‐GCM reasonably reproduces the 6 day wave in temperature and horizontal winds in the mesosphere and lower thermosphere region during the vernal equinox. The E region wind dynamo exhibits a prominent 6 day oscillation that is directly modulated by the 6 day wave. Meanwhile, significant local time variability (diurnal and semidiurnal) is also seen in wind dynamo as a result of altered tides due to the nonlinear interaction between the 6 day wave and migrating tides. More importantly, the perturbations in the E region neutral winds (both the 6 day oscillation and tidal‐induced short‐term variability) modulate the polarization electric fields, thus leading to the perturbations in vertical ion drifts and ionospheric F 2 region peak electron density ( N m F 2 ). Our modeling work shows that the 6 day wave couples with the ionosphere via both the direct neutral wind modulation and the interaction with atmospheric tides.