Strong evidence for couplings between the ionospheric wave-4 structure and atmospheric tides

Details Strong evidence for couplings between the ionospheric wave-4 structure and atmospheric tides Strong evidence for couplings between the ionospheric wave-4 structure and atmospheric tides

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3814101h&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 14, CiteID L14101

Other

Ionosphere: Equatorial Ionosphere, Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Ionospheric Dynamics, Atmospheric Processes: Thermospheric Dynamics (0358), Atmospheric Processes: Tides And Planetary Waves

Scientific paper

Recently a so-called “wave-4 structure” was discovered in the equatorial ionosphere, which describes plasma density enhancements within four longitude sectors separated about 90° from each other. This structure was proposed to be controlled by the tide mode of DE3 (diurnal eastward-propagating with zonal wave number-3) excited by different heating in the tropical troposphere due to land-sea differences. Here, using F2-layer peak density (NmF2) and the peak height (hmF2) extracted from the COSMIC data set, we investigate the wave-4 structure by decomposing it into interhemispheric symmetric and antisymmetric components. Our results indicate that the generally accepted mechanism of DE3 modulation of E region dynamo only accounts for the daytime symmetric components, while the antisymmetric components could be explained well in the terms of the SE2 (semidiurnal eastward-propagating with zonal wave number-2) tide in transequatorial neutral wind. Surprisingly, the antisymmetric component dominates the wave-4 structure in hmF2 during nighttime, suggesting the SE2 transequatorial wind is the leading contributor to the nighttime wave-4 structure in hmF2.

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