Acceleration and stochastic heating of ions drifting through an auroral arc

Details Acceleration and stochastic heating of ions drifting through an auroral arc Acceleration and stochastic heating of ions drifting through an auroral arc

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719333r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,333-19,339.

Physics

8

Auroral Arcs, Field Aligned Currents, Ionospheric Currents, Ionospheric Drift, Ionospheric Heating, Stochastic Processes, Geomagnetic Tail, Harmonic Oscillators, Ion Accelerators, Ion Charge, Neutral Sheets

Scientific paper

We find that ions E x B drifting through an auroral arc can undergo transverse acceleration and stochastic heating. This result is very analogous to recent work regarding similar phenomena in the magnetotail (Buechner and Zelenyi, 1990; Chen and Palmadesso, 1986; Brittnacher and Whipple, 1991). An analytic expression for the maximum arc width for which chaotic behavior is present is derived and numerically verified. We find, for example, that a 1.5-km-thick arc at Lambda = 65 deg requires a minimum potential drop of 3 kV for transverse ion acceleration and heating to occur. Thicker arcs require higher potential drops for stochasticity to occur. This mechanism could be a source for conic ions.

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