Low-frequency mobility response functions for the central plasma sheet with application to tearing modes

Details Low-frequency mobility response functions for the central plasma sheet with application to tearing modes Low-frequency mobility response functions for the central plasma sheet with application to tearing modes

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5893h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5893-5906.

Physics

16

Collisionless Plasmas, Current Sheets, Particle Diffusion, Plasma Layers, Tearing Modes (Plasmas), Chaos, Correlation, Particle Trajectories, Power Spectra, Stochastic Processes, Vlasov Equations

Scientific paper

Consideration is given to the effect of constant cross-tail magnetic field By on the collisionless conductivity produced by chaotic scattering and stochastic diffusion of particles in the current sheet for a parabolic geometry. It is shown that the correlation time scales as (By/Bz)-squared, and from this strong By scaling a strong tendency toward stabilization of the linear tearing modes with increasing values of By is inferred. This effect of increased dawn-dusk mobility is particularly dramatic when electrons are introduced in the calculation, and is in agreement with the results of kinetic particle simulations. The collisionless conductivity is expressed in terms of the ensemble-averaged power spectrum of the single particle trajectories, which makes it possible to calculate directly the linear conductivity instead of deriving it from the calculation of the irreversible heating rates.

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