Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13b0284e&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA13B-0284
Physics
2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335)
Scientific paper
A new large-scale longitudinal structure has recently been discovered in the equatorial ionosphere. The peak plasma density and separation of the two bands of the post-sunset equatorial ionospheric anomaly (EIA) observed by the FUV instruments onboard the NASA IMAGE and TIMED satellites were found to vary significantly, with maxima in 4 sectors around the planet during equinox. It has been demonstrated that this wavenumber-4 structure corresponds well with the non-migrating diurnal tide in the lower thermosphere. Modulation of the strength of the E-region dynamo fields and associated equatorial fountain in the F-region ionosphere by these tides has been suggested to be the likely mechanism for creating the observed longitudinal variations in the EIA. Here we present the first attempts to use the NRL SAMI2 model to quantify what change in the dynamo fields as a function of universal time and longitude would be required to reproduce changes in the EIA of the same order as those observed by IMAGE and TIMED.
England Scott L.
Huba Joseph D.
Immel Thomas J.
Mende Stephen B.
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