Excitation of Magnetosonic Waves in the Terrestrial Magnetosphere: Particle-in-cell Simulations

Details Excitation of Magnetosonic Waves in the Terrestrial Magnetosphere: Particle-in-cell Simulations Excitation of Magnetosonic Waves in the Terrestrial Magnetosphere: Particle-in-cell Simulations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1720l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1720

Physics

Plasma Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [7829] Space Plasma Physics / Kinetic Waves And Instabilities

Scientific paper

Two-dimensional electromagnetic particle-in-cell simulations are performed to study the temporal development of an ion Bernstein instability driven by a proton velocity distribution with positive slope in the perpendicular velocity distribution function fp(v_⊥), where ⊥ denotes directions perpendicular to the background magnetic field {B}0. The instability grows at propagation angles nearly perpendicular to {B}0, and at frequencies close to the harmonics of the proton cyclotron frequency. The simulated field fluctuation spectrum shows peaks near the first few harmonics of the proton cyclotron frequency and resembles observations of ULF waves, commonly referred to as fast magnetosonic waves, near the geomagnetic equator in the terrestrial magnetosphere. This growing mode may play an important role in the transverse heating of thermal protons and the acceleration of radiation-belt electrons.

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