Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113723f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13723-13728.
Physics
144
E Region, Electric Field Strength, Equatorial Atmosphere, F Region, Ionospheric Conductivity, Wind Effects, Atmospheric Models, Diurnal Variations, Dynamo Theory, Magnetic Equator, Reversing
Scientific paper
The electric fields in the ionospheric E and F regions near the magnetic equator often show a strong eastward enhancement shortly after sunset and before the eastward (normally) daytime field reverses to westward. Several theoretical models of the low-latitude fields suggest that this enhancement is caused mainly or entirely by F region winds (the F region dynamo), but some authors have suggested that it could be produced solely by E region tidal winds. Additional calculations and arguments in support of the F region source are given. The enhancement of the eastward field for an eastward F region wind turns out to be a simple direct consequence of the fact that after sunset the ionospheric conductivity decreases far more rapidly in the E region than in the F region.
Bonelli Eduardo
Farley Donald T.
Fejer Bela G.
Larsen Mark F.
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