Geographic asymmetries of the Viking auroral distribution - Implications for ionospheric coordinate systems

Details Geographic asymmetries of the Viking auroral distribution - Implications for ionospheric coordinate systems Geographic asymmetries of the Viking auroral distribution - Implications for ionospheric coordinate systems

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1653h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1653-1667.

Physics

7

Auroras, Satellite Imagery, Earth Ionosphere, Geomagnetic Tail

Scientific paper

A number of old concepts concerning the Viking auroral distribution are reexamined on the basis of the current understanding of the magnetosphere. Two new coordinate systems are described using magnetospheric magnetic field models which leave the aurora invariant under a much wider range of conditions than was previously possible. The cross-tail current running from dawn to dusk in the near-earth magnetotail maps to a circular distribution if a centered dipole field is used in combination with the external field. The diameter of the main UV auroral oval can be linked directly to the strength and location of the peak in the cross-tail current distribution. Model calculations and observations indicate that the auroral distribution can have significant deviations from circularity even in corrected geomagnetic coordinates. The auroral distribution moves equatorward with increasing magnetic activity in response to an enhanced cross-tail current which moves eastward.

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