Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm31a2073s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM31A-2073
Physics
Plasma Physics
[2704] Magnetospheric Physics / Auroral Phenomena, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7827] Space Plasma Physics / Kinetic And Mhd Theory
Scientific paper
The generation of parallel electric fields and associated low density cavities in auroral acceleration regions is a result of Alfvenic interactions in the M-I coupling system. The focus of this presentation is the mechanism of the generation of parallel electric fields. The dynamic generation of parallel electric fields in discrete auroral arcs may be the result of nonlinear Alfvenic interactions. Due to the approximate conservation of total magnetic helicity and angular momentum, the nonlinear interaction between incident and reflected Alfvén wave packets in the auroral acceleration region causes a local enhancement of azimuthal magnetic flux. This local dynamo effect supports and maintains parallel electric fields, which deepen the auroral density cavity. We will present new developments in the theory of two fluid kinetic Alfven waves (KAW). In the existing linear two fluid KAW theory, the generation of parallel electric fields associated with Alfven waves has not been completely given. Our approach emphasizes the physics of the generation of parallel electric field, which is particularly important in the nonlinear regime. This theory is able to explain the formation of not only Alfvénic auroral arcs but also inverted-V auroral arcs, which have larger spatial scales and can produce higher energy electrons than Alfvenic acceleration.
Lysak Robert L.
Song Yushu
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