Enhanced velocities and a shear in daytime E(sub sq) over Kwajalein and their relationship to 150 km echoes over the dip equator

Details Enhanced velocities and a shear in daytime E(sub sq) over Kwajalein and their relationship to 150 km echoes over the dip equator Enhanced velocities and a shear in daytime E(sub sq) over Kwajalein and their relationship to 150 km echoes over the dip equator

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2741t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 24, p. 2741-2744

Physics

19

Daytime, E Region, Echoes, Electric Fields, Electrodynamics, Gravity Waves, Velocity, Doppler Radar, Radar Measurement, Variations

Scientific paper

We present the first evidence of enhanced irregularity-drift velocities and a velocity shear in the daytime E region at 4.3 deg N dip latitude. These features, found in radar measurements from Kwajalein during q-type sporadic E (E(sub sq)) events, are interpreted in terms of a polarization electric field that develops in response to the presence of latitudinal gradients in field-line-integrated conductivity caused by sporadic-E layers. Because the E region over Kwajalein connects directly to 150-km altitude over the magnetic dip equator, we suggest that a similar polarization process is responsible for the so-called 150-km echoes that have been observed routinely by the Jicamarca radar.

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