Dependence of AKR Growth rate on Electron Velocity Distribution Parameters and Perturbation by Solitary Structures

Details Dependence of AKR Growth rate on Electron Velocity Distribution Parameters and Perturbation by Solitary Structures Dependence of AKR Growth rate on Electron Velocity Distribution Parameters and Perturbation by Solitary Structures

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm53a1447m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM53A-1447

Physics

0654 Plasmas, 2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409), 2753 Numerical Modeling

Scientific paper

We have investigated the growth rate and bandwidth associated with radiation from the cyclotron maser instability as a function of the ambient electron velocity distribution and k-vector orientation. We used an analytic horseshoe velocity distribution similar to that observed in the acceleration region of the Earth's magnetosphere. The growth rate depends most strongly on horseshoe width and effective radius, as well as the plasma density and the k-vector orientation. While the growth rate is typically strongest for k∥ = 0, for some electron distributions the growth rate is peaked near k∥/k ≍ ± 0.1. We find that perturbation of the velocity distribution by small-scale solitary structures (e.g., ion and electron holes, tri-polar structures) can either enhance or diminish the growth rate depending on the ambient electron velocity distribution. We compare these results to several recent papers in which AKR fine structure is associated with these perturbations.

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