What determines the latitudinal extent of the auroral acceleration region?

Details What determines the latitudinal extent of the auroral acceleration region? What determines the latitudinal extent of the auroral acceleration region?

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55.1171b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 8, p. 1171-1184.

Physics

7

Auroral Arcs, Electron Acceleration, Field Aligned Currents, Geomagnetic Tail, Magnetohydrodynamics, Dynamic Models, Electric Fields, Electron Precipitation

Scientific paper

The spatial extent of the auroral precipitation region and, possibly, embedded auroral arcs is examined by using large-scale equilibrium models, resistive MHD simulations, and basic estimates. The latitudinal width in the ionosphere is found to be closely related to the characteristic scale height of the cross-tail current distribution. Dynamic region 1 currents are shown to be related to the velocity shear of earthward flow, which can be generated by a tail instability. The possible role of flow and its shear or vorticity in generating field-aligned currents is discussed.

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