Physics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..847t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 7, p. 847-850
Physics
4
E Region, Electrodynamics, Equatorial Regions, Incoherent Scatter Radar, Space-Time Functions, Metal Ions, Periodic Variations, Plasma Density, Time Series Analysis, Wind Shear
Scientific paper
We describe the first incoherent-scatter (IS) radar measurements made of the daytime E layer at equatorial latitudes. Using ALTAIR, a steerable IS radar located in the Kwajalein Atoll, we not only show that the E-layer profiles are consistent with those obtained in-situ by rockets, we present the first direct evidence of a latitudinal gradient in plasma density in the bottomside E layer that extended from 3 deg N dip latitude to beyond 6 deg N. We suggest that the gradient involves the electrodynamic transport of metallic ions, e.g., the gradient could be produced by the equatorial metallic-ion fountain or possibly by the dumping of metallic ions at the base of the E layer by the wind-shear mechanism for sporadic E. We close with a brief discussion of the implications of such a gradient on the equatorial electrojet.
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