Magnetic field rotation and transition width in rotational discontinuities and Alfvén wave trains

Details Magnetic field rotation and transition width in rotational discontinuities and Alfvén wave trains Magnetic field rotation and transition width in rotational discontinuities and Alfvén wave trains

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105..139l&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A1, p. 139-156

Physics

Plasma Physics

6

Space Plasma Physics: Discontinuities, Space Plasma Physics: Magnetic Reconnection, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Numerical Simulation Studies

Scientific paper

A hybrid simulation is carried out to study the evolution of magnetic field rotations in rotational discontinuities (RDs) and large-amplitude Alfvén wave trains (AWTs) whose initial field rotation angle |ΔΦ|>180°. For a given initial half width D, the RDs or AWTs lose a multiple of +/-360° field rotation at a critical time, until a smallest rotation angle |ΔΦ|<180° is reached. The critical time tc for losing the first 360° field rotation is found to be tc~=F(ΔΦ,β1,θBn)D3.3+/-0.8, where the function F decreases linearly with ΔΦ, decreases linearly with β1 for upstream ion beta β1>0.1, and decreases with decreasing shock normal angle θBn. At t180° for a given transient convection time at the dayside magnetopause and minimum widths of AWTs per 360° field rotation in the solar wind.

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