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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar wind turbulence and production of proton beams Voitenko Yuriy , Pierrard Viviane Belgian Institute for Space Aeronomy Super-Alfvénic proton beams are a common observation in the fast solar wind, but their origin is still uncertain. We consider the possibility that these beams are generated by the dissipation range of the solar wind turbulence. In accordance to modern turbulence theories, the spectral energy transport in the solar wind is dominated by the perpendicular cascade towards small perpendicular length scales. When the cross-field wavelengths become of the order of ten ion gyroradii or less, kinetic effects come into play initiating wave-particle interactions and plasma energization. In this case the dissipation range of the solar wind turbulence is formed by highly oblique kinetic Alfvén waves (KAWs). We study the field-aligned electric potential well created by the KAWs in the dissipation range and its effect on the solar wind protons. The average KAW potential propagates with the super-Alfvén velocity that depends on the KAW spectral index and spectral breaks in such a way that it is larger in the old (developed) turbulence than in the young (under-developed) turbulence. We show that the protons trapped by the potential well closer to the Sun, where the turbulence is younger, can be accelerated to 1.5-2 Alfvén velocities at larger heliocentric distances, where the turbulence is older, building up the proton beam with the relative number density about 0.1.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Inhomogeneous currents and anomalous resistivity along auroral field lines Voitenko Yuriy , De Keyser Johan Belgian Institute for Space Aeronomy Field-aligned auroral currents are intrinsically inhomogeneous across the background magnetic field, which may have a significant influence on the physics of magnetosphereionosphere coupling. We study effects of current inhomogeneity on current-driven microinstabilities that could result in the anomalous resistivity along auroral field lines. We show that the current shear, even with relatively small cross-field gradient, highly reduces the thresholds of kinetic ion sound (KSW) and kinetic Alfvén waves (KAWs) micro-instabilities. The KAW instability dominates for relatively high plasma β ~ 0.1, whereas the KSW instability dominates for β
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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