Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3601r&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 24, p. 3601-3604
Physics
30
Ionosphere: Auroral Ionosphere, Magnetospheric Physics: Current Systems, Magnetospheric Physics: Electric Fields, Magnetospheric Physics: Energetic Particles, Precipitating
Scientific paper
Existing theories do not explain large parallel electric fields that are associated with keV electron precipitation in auroral arcs. The MHD electron response results in an electrical conductivity in the low altitude magnetosphere that is two orders of magnitude greater than is required. We suggest a new mechanism for forming parallel electric fields based on a nonlocal electron response to standing shear Alfvén waves on dipole magnetic fields. Electron trapping is the primary cause of a significant reduction in the collisionless electron conductivity and consequent enhancement of parallel electric fields in the 1-4 mHz frequency range.
Rankin Robert
Samson John C.
Tikhonchuk Vladimir T.
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