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Alfvén wave evolution into magnetic filaments in 3-D space plasma

GND
1198894776
Affiliation
Institut für Theoretische Physik, Technische Universität Braunschweig
Comisel, Horia;
GND
131591223
Affiliation
Space Research Institute, Austrian Academy of Sciences
Narita, Yasuhito;
GND
1198895373
Affiliation
Institut für Theoretische Physik, Technische Universität Braunschweig
Motschmann, Uwe

Nonlinearities in space and astrophysical plasmas generate a set of magnetic filaments or bundles that have an incompressible sense of fluctuations and propagate highly obliquely to the mean magnetic field. Those filaments are caused by wave–wave interactions in which a large-amplitude Alfvén wave (or pump Alfvén wave) is disturbed by thermal, density fluctuations and collapses into obliquely propagating Alfvén waves at shorter wavelengths than the pump. Hybrid simulations confirm the filament excitations in the three-dimensional low-beta plasma. Alfvén waves develop into magnetic filaments on a time scale of about 300 ion gyrations. The filaments grow in a multi-channel way at various azimuthal angles around the mean magnetic field.

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