Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm23b0418d&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM23B-0418
Other
2744 Magnetotail, 2764 Plasma Sheet, 2772 Plasma Waves And Instabilities (2471), 4420 Chaos (7805)
Scientific paper
The influence of the magnetic field component parallel to the equilibrium current direction (guide field) on the non-adiabatic particle dynamics as well as on the features of current-driven instabilities in thin current sheets is explored. The properties of thin current sheets with the thickness comparable to the thermal ion gyroradius in the field outside the sheet may be very sensitive to the features of the single-particle motion, and in particular to its type (regular, chaotic or quasi-adiabatic). Simple criteria of the particle motion type, based on the comparison of the particle minimum Larmor frequency and the maximum bounce frequency, may be misleading in the presence of the guide field. We reconsider this issue and show, in particular, that the particle dynamics may remain quasi-adiabatic notwithstanding a considerable guide field. The guide field formally disappears from the steady-state Vlasov models of both the Harris current sheet and its generalizations assuming plasma anisotropy and non-gyrotropy. Therefore, this field can readily be included in particle simulations starting from these models. On the other hand, the guide field strongly affects the dynamics of thin current sheets. We report on the results of such simulations of current-driven instabilities in thin Harris sheets and their anisotropic/non-gyrotropic generalizations. The simulation results are compared with Cluster observations.
Dunstan R.
Guzdar Parvez N.
Sitnov Mikhail I.
Swisdak Michael
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