Physics – Plasma Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11105204l&link_type=abstract
Journal of Geophysical Research, Volume 111, Issue A5, CiteID A05204
Physics
Plasma Physics
11
Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Space Plasma Physics: Kinetic Waves And Instabilities, Space Plasma Physics: Shock Waves (4455), Space Plasma Physics: Wave/Particle Interactions (2483, 6984)
Scientific paper
When the incident solar wind H+ and other minor ions cross a shock, they are decelerated differentially by the electrostatic potential at the shock. Therefore ring beam distributions of the minor ions are formed downstream of a quasi-perpendicular shock in the downstream frame. Moreover, the H+ distribution downstream of the quasi-perpendicular shock usually has large perpendicular temperature anisotropy. The He2+ ring beam distribution and H+ temperature anisotropy can excite helium cyclotron waves and proton cyclotron waves, respectively. In this paper, we perform one-dimensional hybrid simulations to investigate the competition between the helium cyclotron waves and proton cyclotron waves, and their influences on the evolution of He2+ and O6+ velocity distributions are also considered. When the wave spectrum is dominated by the helium cyclotron waves, He2+ and O6+ approximately move on the surface of a sphere, which results in shell-like distributions for He2+and O6+. With the increase of the H+ temperature anisotropy T$\perp$p/T$\parallel$p, the amplitude of the proton cyclotron waves also increases. When it is sufficiently large and comparable with that of the helium cyclotron waves, the motions of He2+ and O6+ are irregular, which results in bi-Maxwellian distributions of He2+and O6+. We also investigate the influence of the plasma β$\parallel$p on the excited ion cyclotron waves and the evolution of the He2+and O6+ distributions. The simultaneous observations for He2+ and O6+ in the downstream of shocks with Active Magnetospheric Particle Tracer Explorers (AMPTE)/CCE spacecraft have demonstrated their shell-like distributions. The observed results verify the existence of the helium cyclotron waves downstream of supercritical quasi-perpendicular shocks.
Lu Quan-Ming
Wang Shuang
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