Polarization electric fields in the nighttime F layer at Arecibo

Physics

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Electric Fields, F Region, Incoherent Scatter Radar, Ionospheric Conductivity, Radar Measurement, Dynamo Theory, E Region, Electrodynamics, Night Sky, Polarization (Charge Separation)

Scientific paper

Incoherent scatter radar measurements made in 1981 and 1982 are used to determine the electrical conductivity of the nighttime E and F regions at Arecibo, Puerto Rico. The height-integrated Pedersen conductivity of the F region exceeds that of the E region by a factor of 10 on the average. It is therefore concluded that, for the solar maximum conditions studied, the local E region has little influence on nighttime F region electrodynamics. Simultaneous measurements of ion and neutral velocities are often inconsistent with the hypothesis that a fully developed electric polarization field is generated by dynamo action in the local F region. A better explanation of the present results is obtained by including the influence of polarization fields that originate in the F region of the conjugate hemisphere.

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