Simultaneous conjugate observations of dynamic variations in high-latitude dayside convection due to changes in IMF By

Details Simultaneous conjugate observations of dynamic variations in high-latitude dayside convection due to changes in IMF By Simultaneous conjugate observations of dynamic variations in high-latitude dayside convection due to changes in IMF By

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.8057g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 8057-8072. Research supported by NERC.

Physics

97

Convection, Daytime, Earth Ionosphere, Interplanetary Magnetic Fields, Plasma Drift, Polar Cusps, Space Plasmas, Earth Magnetosphere, High Frequencies, Physics And Chemistry Experiment In Space, Radar

Scientific paper

Data from two conjugate HF radars currently operating at Goose Bay (Labrador) and the Halley Station (Antarctica), obtained for a single 45-min period about local noon on April 22, 1988, were used to study the near-instantaneous conjugate two-dimensional patterns of plasma convection in the vicinity of the cusp. In particular, the response of these plasma convection patterns to changes in the By component of the IMF was examined. Results indicate that, under quasi-stationary IMF conditions, the conjugate convection patterns are quite similar to the synthesized patterns of Heppner and Maynard (1987) and that the patterns respond rapidly to changes in the IMF By component. Results also show that transitions between convection states begin to occur within minutes of the time that an IMF state change is incident on the magnetospheric boundary, and that the convection reconfigurations expand poleward, completely filling the field of view of an HF radar within 6 min of the time of onset.

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