Laboratory realization of an ion-ion hybrid Alfvén wave resonator

Details Laboratory realization of an ion-ion hybrid Alfvén wave resonator Laboratory realization of an ion-ion hybrid Alfvén wave resonator

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3811101v&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 11, CiteID L11101

Physics

Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Magnetospheric Physics: Plasma Waves And Instabilities (2471)

Scientific paper

In a magnetized plasma with two ion species, shear Alfvén waves (or guided electromagnetic ion cyclotron waves) have zero parallel group velocity and experience a cut-off near the ion-ion hybrid frequency. Since the ion-ion hybrid frequency is proportional to the magnetic field, it is possible, in principle, for a magnetic well configuration to behave as an Alfvén wave resonator in a two-ion plasma. This study demonstrates such a resonator in a controlled laboratory experiment using a H+-He+ mixture. The resonator response is investigated by launching monochromatic waves and sharp tone-bursts from a magnetic loop antenna. The observed frequency spectra are found to agree with predictions of a theoretical model of trapped eigenmodes.

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