Generalized adiabatic theory applied to the magnetotail current sheet

Details Generalized adiabatic theory applied to the magnetotail current sheet Generalized adiabatic theory applied to the magnetotail current sheet

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.144..231r&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 144, no. 1-2, May 1988, p. 231-256.

Astronomy and Astrophysics

Astrophysics

5

Adiabatic Equations, Current Sheets, Geomagnetic Tail, Geomagnetism, Magnetic Field Configurations, Magnetic Moments, Maxwell-Boltzmann Density Function, Plasma Currents, Plasma Density, Plasma Drift

Scientific paper

The authors use the generalized first adiabatic invariant to treat particles in the magnetotail current sheet. The equations of motion can be expressed in terms of drift parameters which vary slowly and smoothly at the drift rate, not at the gyration rate. The analysis leads to boundaries in phase space which form a generalized loss cone and separate particles drifting into and out of the layer from particles trapped within the layer. The authors give examples of how different kinds of particle orbits contribute to the spatial profiles of density and current and thus to the field structure of the current sheet. They find that the parallel pressure of the drifting particles must exceed the transverse pressure for self-consistent solutions to exist, and based on this result, they give examples of fully self-consistent solutions using bi-Maxwellian ion and Maxwellian electron distributions. A proof of Cowley's (1978) theorem is given that particles trapped in the current layer experience zero net drift.

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