Internal consistency of the Tsyganenko magnetic field model and the Heppner-Maynard empirical model of the ionospheric electric field distribution

Details Internal consistency of the Tsyganenko magnetic field model and the Heppner-Maynard empirical model of the ionospheric electric field distribution Internal consistency of the Tsyganenko magnetic field model and the Heppner-Maynard empirical model of the ionospheric electric field distribution

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1043d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, June 1991, p. 1043-1046. NSERC-supported research.

Physics

17

Atmospheric Electricity, Convective Flow, Earth Ionosphere, Electric Field Strength, Geomagnetic Tail, Neutral Sheets, Magnetohydrodynamics, Space Plasmas

Scientific paper

The Tsyganenko magnetic field models (1987 and 1989) are used to map the electric field distribution of Heppner and Maynard (1987) into the geomagnetic tail and to infer the velocity of the central plasma sheet (CPS) convective flow. Qualitatively different convection patterns are obtained from the two Tsyganenko models. Results obtained with the 1987 model predict a narrow jet of earthward moving plasma in the center of the CPS, while the 1989 model predicts relatively uniform earthward convection throughout the CPS. It is concluded from in situ observations of the CPS convection that the 1989 model provides the most realistic mapping. The convection distributions derived from measurements are compared with convection patterns inferred from the two magnetic field models and the Heppner-Maynard ionospheric convection model to help evaluate the magnetic field models. The results of this comparison can be used to direct research aimed at improving the magnetic field models.

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