Nonlinear evolution of magnetopause tearing modes

Details Nonlinear evolution of magnetopause tearing modes Nonlinear evolution of magnetopause tearing modes

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..137c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 137-146.

Physics

17

Magnetic Field Configurations, Magnetopause, Space Plasmas, Tearing Modes (Plasmas), Lines Of Force, Magnetosheath, Nonlinear Equations, Topology, Wave Packets, Wavelengths

Scientific paper

Since the magnetosheath plasma is highly turbulent, reconnection at the dayside magnetopause is likely to be temporally unsteady. The tearing mode can be viewed as a model for the unsteady development of a reconnecting magnetic topology. Magnetopause tearing occurs in the guide-field limit and has a wave packet spatial structure in the east-west direction. This paper solves for the nonlinear evolution of a single wavelength guide-field tearing mode including the effects of finite transit time on the Landau resonant electrons. Short wavelength modes evolve algebraically in time with perturbation amplitudes proportional to t-squared. Long wavelength modes are fully nonlinear, and the amplitude grows linearly in time.

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