Physics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91..204c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Jan. 1, 1986, p. 204-210. Research supported by the Lockheed Independ
Physics
3
Auroral Arcs, Kinetic Theory, Magnetospheric Instability, Space Plasmas, Adiabatic Conditions, Atmospheric Models, Electric Fields, Field Aligned Currents, Ionospheric Currents, Plasma Turbulence
Scientific paper
A kinetic theory of the origins of the auroral arc scale spectrum is presented in this paper. The conceptual basis of the theory is current conservation in a turbulent plasma at the magnetospheric equatorial region in which a field-aligned current is generated and the local electrostatic potential structure is forced to adjust to the presence of the field-aligned current. This simple model uses an ad hoc Ohm's law relationship between the perpendicular current and the perpendicular electric field, but with a negative conductance in the generator region so that J(perpendicular) x E(perpendicular) is less than 0. An exact solution of a simple model of the concept yields a bistatic auroral generator for which multiple-arc formation is predicted if the field-aligned current exceeds a critical value. The predicted scale spectrum is inversely proportional to the square root of the field-aligned current strength spectrum.
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