Particle Orbits in Magnetospheric Current Sheets: Accelerated Flows, Neutral Line Signature, and Transitions to Chaos
- Gordon R. Wilson
Published Online: 18 MAR 2013
Copyright 1991 by the American Geophysical Union.
Modeling Magnetospheric Plasma Processes
How to Cite
Speiser, T. W., Dusenbery, P.B., Martin, R.F. and Williams, D.J. (1991) Particle Orbits in Magnetospheric Current Sheets: Accelerated Flows, Neutral Line Signature, and Transitions to Chaos, in Modeling Magnetospheric Plasma Processes (ed G. R. Wilson), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM062p0071
- Published Online: 18 MAR 2013
- Published Print: 1 JAN 1991
Print ISBN: 9780875900285
Online ISBN: 9781118663905
- Space plasmas—Mathematical models—Congresses;
- Magnetosphere—Mathematical models—Congresses
Theory of particle motion in current sheets is reviewed. For small, approximately constant normal magnetic field, B z particles oscillate about the current sheet and “live” within the sheet for one-half gyroperiod based on B z. This lifetime replaces the mean collision time in the Lorentzian conductivity and thus gives rise to the concept of an inertial (or gyro-) conductivity. Asubstorm modelby Coroniti  utilizes this conductivity to allow reconnection to proceed without anomalous processes due to wave-particle interactions. Chaotic particle orbitsmay at times be important to the dynamics, depending on parameters such as particle energy, current sheet thickness, and field line curvature. A current sheet model with neutral line predicts a ridge structure and asymmetries in the distribution function. Observed ion distributions near the plasmasheet boundary layer, during the CDAW 6 interval, are consistent with the model predictions.