Physics – Plasma Physics
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3306106d&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 6, CiteID L06106
Physics
Plasma Physics
4
Magnetospheric Physics: Plasma Sheet, Space Plasma Physics: Charged Particle Motion And Acceleration, Magnetospheric Physics: Magnetotail Boundary Layers, Magnetospheric Physics: Numerical Modeling
Scientific paper
We examine the non-linear dynamics of charged particles in ``bifurcated'' (double-humped) current sheets. We show that, when the adiabaticity parameter $\kappa$ is of the order unity, particles experience a negligible change of magnetic moment. Such a behavior contrasts with the prominent magnetic moment scattering that is achieved in single-humped current sheets at such $\kappa$ values. It resembles the quasi-adiabatic (Speiser-type) behaviors that is obtained at $\kappa$ $\ll$ 1 as a result of resonance between the fast oscillation about the midplane and the slow gyromotion near this plane. We demonstrate that beams of $\kappa$ ~ 1 particles may form downstream of bifurcated current sheets, which propagate along the magnetic field lines up to high latitudes. Quasi-adiabaticity and associated beam formation thus occur at significantly larger $\kappa$ values in double-humped current sheets than in single-humped ones, or equivalently for lower particle energy and/or weaker field reversal.
Delcourt Dominique C.
Malova H. V.
Zelenyi Lev M.
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