Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.1367k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 1, 1985, p. 1367-1374.
Physics
6
Current Distribution, Electric Fields, Ionospheric Currents, Kp Index, Magnetic Variations, Cross Correlation, Ionospheric Conductivity, Ionospheric Heating, Polar Regions
Scientific paper
Global distribution of ionospheric currents, field-aligned currents, electric fields, and Joule heat above the north polar region are determined from geomagnetic variations recorded at 107 stations and from modeled values of ionospheric conductance during two Coordinated Data Analysis Workshop 6 intervals. Several scalar indices reflective of changes in magnetic and electric fields at high altitudes are also computed. It is found that the latitudinal width of the westward electrojet current expands with an increase, and contracts with a decrease, in current density. It is shown that, when the electric potential difference across the polar cap is large in relation to a given intensity of the total current, the 'true' ionospheric current shows a maximum westward electrojet near dawn and a maximum eastward electrojet near dusk. A schematic visualization of the currents, fields, and Joule heat for late March are included.
Kamide Yohsuke
Kroehl Herbert W.
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