Physics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..577b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 40, May 1978, p. 577-580.
Physics
2
Bays (Topographic Features), Coastal Water, Continental Shelves, Electric Current, Magnetic Induction, Sea Water, Auroral Electrojets, Field Aligned Currents, Magnetic Signatures, Oceanography, Perturbation Theory, Polar Substorms, Ring Currents
Scientific paper
It is shown that induced currents in the sea can have a significant effect on magnetic bays at coastal observatories. The magnetic bays at Halley Bay (75 deg S, 27 deg W), a coastal site in the Antarctic, correspond to an electrojet to the south of the station modified by the effect of induced currents in the adjacent ocean. These currents flow parallel to the edge of the continental shelf and, because of its alignment, have a greater effect on bays in the D component than on those in the H component. Whether this occurs depends on the relative magnitudes of the D perturbation arising because of the coastal effect, Dc, and the normal perturbation, Dn, that would otherwise be observed. Any effects of field-aligned currents would be reflected in Dn and whether or not they were observed would depend on the ratio Dc/Dn.
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