Kinematic properties of the F region ion velocity field inferred from incoherent scatter radar measurements at Arecibo

Details Kinematic properties of the F region ion velocity field inferred from incoherent scatter radar measurements at Arecibo Kinematic properties of the F region ion velocity field inferred from incoherent scatter radar measurements at Arecibo

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3345b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3345-3355.

Physics

19

Electric Potential, F Region, Ionospheric Ion Density, Line Of Sight, Radar Measurement, Radar Scattering, Error Analysis, Incoherent Scatter Radar, Velocity Distribution

Scientific paper

A new multiple-frequency incoherent scatter observing technique has improved the precision of F region ion velocity measurements at Arecibo. This technique makes it possible to analyze velocity data without making the assumption that the horizontal gradients in each component of the velocity vector are zero. By assuming that spatial gradients in ion velocity are constant and that the magnetic field line through the F region is equipotential, it is possible to determine completely the variation of the ion velocity vector in the plane of the magnetic meridian. The horizontal divergence of the velocity vector is generally observed to be small. At night, the most significant spatial variation in the ion velocity field is usually converging flow parallel to the magnetic field; this reverses to diverging flow in the daytime. Neglect of these horizontal gradients in the vertical ion velocity can result in systematic errors in the evaluation of the meridional ion velocity as large as 30 m/s.

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