Predictions of lithium interactions with earth's bow shock in the presence of wave activity

Physics

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Earth Magnetosphere, Ion Injection, Lithium, Particle Interactions, Space Plasmas, Atmospheric Models, Bow Waves, Ion Distribution, Positive Ions, Shock Wave Interaction

Scientific paper

The results of a test-particle simulation studying the movement of a lithium tracer ion injected upstream of the bow shock are reported. Wave activity consists of parallel and antiparallel propagating Alfven waves characterized by a frequency power spectrum within a frequency or range of amplitudes defined separately in the upstream and downstream regions. The results show that even a moderate level of wave activity can substantially change the results obtained in the absence of waves. Among the effects observed are: (1) increased ion transmission; (2) both the average energy gain and spread about the average are increased for transmitted and reflected particles; (3) the average final pitch angle for transmitted particles tends to 90 deg, and the spread of reflected particles is reduced; and (4) the spatial dispersion of the ions on the bow shock after a single encounter is increased.

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