F-region ionospheric structure associated with antisunward flow near the dayside polar cusp

Details F-region ionospheric structure associated with antisunward flow near the dayside polar cusp F-region ionospheric structure associated with antisunward flow near the dayside polar cusp

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..907k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, Sept. 1984, p. 907-910.

Physics

23

Atmospheric Ionization, F Region, Plasma Density, Plasma Drift, Polar Cusps, Convective Flow, Daytime, Incoherent Scatter Radar, Solar Terrestrial Interactions

Scientific paper

After one year of measurements using the Sondrestrom incoherent-scatter radar (74 deg Lambda), a number of repeatable features have been identified that interrelate the F-region ionization, and plasma convection patterns. One of these is an extended (poleward) ridge of ionization frequently present overhead near magnetic local noon. This ionization enhancement is associated with large ion drift velocities, with a significant poleward component. Similar ionization features have been reported and thought to be produced by convection of F-layer plasma through an ionization source soft particle precipitation associated with the polar cusp. In this study, however, it was possible to measure the electron temperature as well as number density and drift velocity. These measurements indicate that the electron temperature is not elevated within the density enhancement suggesting that the enhancement is not caused by local soft particle precipitation. Rather, it may simply be F-region plasma convected from lower latitudes, with correspondingly lower solar zenith angles.

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