Effects of nonlinear Alfvén wave interaction on particle diffusive shock acceleration. The Earth’s bow shock |
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| Authors: | E G Berezhko S I Petukhov S N Taneev |
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| Institution: | (1) Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, pr. Lenina 31, Yakutsk, 677891, Russia |
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| Abstract: | We investigate the role of nonlinear Alfvén-wave interaction in the diffusive shock acceleration of solar-wind ions at the Earth’s bow shock. Allowance for the nonlinear wave interaction through induced scattering and two-quanta absorption at plasma parameters β?0.1 is shown to limit the Alfvén-wave amplitude δB to δB?B, whereas the quasi-linear approach predicts the generation of waves with amplitudes much larger than the diffusive shock magnetic field strength B. The nonlinear interaction results in spectral wave energy transfer to lower frequencies, which yields a significant increase in the particle acceleration rate. |
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| Keywords: | solar wind Alfvén waves Earth’ s bow shock diffusive acceleration |
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