Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..781..146s&link_type=abstract
THE PHYSICS OF COLLISIONLESS SHOCKS: 4th Annual IGPP International Astrophysics Conference. AIP Conference Proceedings, Volume
Astronomy and Astrophysics
Astrophysics
Plasma-Beam Interactions, Ion Beams, Rotation, Plasma Simulation, Plasma Magnetohydrodynamics, Solar Wind, Shock Waves, Particle Beam Interactions In Plasmas, Two-Fluid And Multi-Fluid Plasmas, Magnetohydrodynamics, Gyrofluid And Gyrokinetic Simulations, Solar Wind Plasma, Sources Of Solar Wind, Planetary Bow Shocks, Interplanetary Shocks
Scientific paper
Localized events of low-frequency quasi-monochromatic waves in the 30s range observed by Cluster in the upstream region of Earth are analyzed. They are associated with a gyro-motion of the two ion populations consisting of the incoming solar wind protons and the back-streaming ions from the shock. A coordinate system is chosen in which one axis is parallel to the ambient magnetic field B0 and the other one is in the vsw×B0 direction. The variation of the plasma parameters is compared with the result of two-fluid Hall-MHD simulations using different beam densities and velocities. Keeping a fixed (relative) beam density (e.g. α=0.005), non-stationary `shock-like' structures are generated if the beam velocity exceeds a certain threshold of about ten times the Alfven velocity. Below the threshold, the localized events represent stationary, nonlinear waves (oscillitons) in a beam-plasma system in which the Reynold's stresses of the plasma and beam ions are balanced by the magnetic field stress.
Dandouras Iannis
Dubinin Edik
Franz Marcel
Glaßmeier K.-H.
Korth Alex
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