Physics – Plasma Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3415104t&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 15, CiteID L15104
Physics
Plasma Physics
11
Magnetospheric Physics: Magnetosheath, Space Plasma Physics: Laboratory Studies And Experimental Techniques, Space Plasma Physics: Turbulence (4490), Space Plasma Physics: Wave/Wave Interactions
Scientific paper
We investigate the effect of slow expansion on a magnetosheath plasma and low-frequency waves using a two-dimensional hybrid expanding box simulation. We start our simulation with a homogeneous high beta plasma, which is marginally stable to the mirror and proton cyclotron instabilities. The expansion is imposed as an external force: the physical size of the simulation box increases in two dimensions: one parallel and one perpendicular with respect to the ambient magnetic field. This expansion leads to a continuous decrease of proton beta and drives an increase of the proton temperature anisotropy. In the early stages of the simulation, both mirror and proton cyclotron waves appear. The system establishes a marginally stable state with respect to both mirror and proton cyclotron instabilities. Initially, the mirror waves dominate the proton cyclotron waves, even when the system is below the linear mirror threshold, but as time increases the proton cyclotron waves become dominant in the low beta region. We also include an initial comparison of the simulated data with Cluster observations.
Dandouras Iannis
Escoubet Christophe P.
Hellinger Petr
Lucek Elizabeth
Taylor Matthew G. G. T.
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