Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9614189h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 1, 1991, p. 14,189-14,194.
Physics
6
Earth Ionosphere, Electrodynamics, Energy Dissipation, Geomagnetism, Interplanetary Magnetic Fields, Solar Terrestrial Interactions, Polar Regions, Solar Wind, Space Plasmas
Scientific paper
It is usually assumed that the profile of the ion Pedersen conductivity determines the altitude dependence of the energy dissipation rate This paper points out the strong altitude dependence of the energy dissipation rate on the spatial scale size of the imposed electric field. To illustrate the importance of such considerations, examples of the ubiquity to electric field structure in the high-latitude ionosphere are shown; this is particularly prominent when the interplanetary magnetic field has a northward component. It is then shown quantitatively how the existence of electric field structure with scale sizes of 10 km or less strongly impacts both the altitude extent over which the electromagnetic energy is dissipated and its partitioning between current systems perpendicular and parallel to the magnetic field.
Heelis Roderick A.
Vickrey James F.
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