Upward propagating tidal effects across the E- and F-regions of the ionosphere

Details Upward propagating tidal effects across the E- and F-regions of the ionosphere Upward propagating tidal effects across the E- and F-regions of the ionosphere

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa43a..01i&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA43A-01

Physics

0310 Airglow And Aurora, 2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2494 Instruments And Techniques

Scientific paper

Recent far-ultraviolet (FUV) observations of Earth have shown the remarkable spatial correspondence between the amplitude of non-migrating atmospheric tides originating in the troposphere and the density and morphology of the nighttime equatorial ionospheric anomaly (EIA). This is likely a result of the modulation of the E-region dynamo electric field in daytime by the tidal winds. In FUV observations around the time of the vernal equinox of 2002, the signature of tidal influence; a wave-4 periodicity in the separation and density of the two EIA bands, itself exhibits significant temporal variability. Here, we seek to understand this variability, and whether (or not) it is linked to variations in the strength of the upward-propagating tides. This study relies on tidal measurements provided by the global observations from the TIMED-SABER instrument that measures the temperature variations in the MLT associated with the upward-propagating tides. TIMED-GUVI provides F-region density measurements concurrent to the MLT temperature retrievals. It is found that the atmospheric and ionospheric zonal wave-4 signatures very nearly covary over a 30-day period, strongly supporting the theory that the dirunal eastward 3 (DE3) tide originating in the troposphere has effects extending to the F-layer of the ionosphere. Additionally, a 6- day periodicity in the power of the ionospheric wave-4 signature is found that may originate with the tide's interaction with longer period planetary waves.

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