Computer Science
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996adspr..18..215k&link_type=abstract
Advances in Space Research, Volume 18, Issue 11, p. 215-215.
Computer Science
Scientific paper
The pickup process of cometary ions in the solar wind leads to strong wave activity. It has been observered at comet P/Halley and at comet P/Grigg-Skjellerup (GS) for example. During Giotto/GS encounter the magnetic background field is nearly perpendicular to solar wind velocity and the cometary ions should form a ring distribution in velocity space. GS is smaller compared to P/Halley, and, since it's inhomogeneity scale is smaller than the pickup scale the ring distribution in phase space cannot be filled completely. Thus, a non-gyrotropic distribution is formed. A non-gyrotropic distribution is a source of free energy; the corresponding excitation of instabilities is discussed. The injection of ions quasi-perpendicular to a constant background magnetic field in a warm proton-electron plasma is studied by 2-d Hybrid-Code Simulation. Typical time scales and properties as for diffusion and growth rate for gyrotropic and non-gyroropic distributions are shown. Different processes are studied. The ring diffusion, the arc diffusion, and the energy diffusion. These processes are depending on the injected ion density and the resulting wave activity (deltaB/B ratio). Times for arc diffusion are ranging from 100Omega^-1_c for low density (rho_p/rho_c ~ 0.001) to 1Omega^-1_c for high density (rho_p/rho_c ~ 0.1); ring diffusion: from 50Omega^-1_c (low density) to 10Omega^-1_c (high density).
Glassmeier Karl-Heinz
Kafemann Heino D. F.
Motschmann Uwe M.
Scholer Manfred
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