Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21a1880d&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM21A-1880
Physics
Plasma Physics
[2704] Magnetospheric Physics / Auroral Phenomena, [2753] Magnetospheric Physics / Numerical Modeling, [7827] Space Plasma Physics / Kinetic And Mhd Theory, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Some of the most intense electron precipitation and largest ion outflows are found in regions of intense, Alfvenic waves. Recent analysis of auroral turbulence suggests that large-scale waves couple energy to smaller scale lengths on the order of the electron inertial, ion-acoustic or ion-gyroradius. In this presentation, we examine the effects of electron temperature on the characteristics of electron acceleration and cross-scale energy coupling of wave energy using a hybrid MHD-kinetic electron simulation of Field Line Resonances in a dipolar coordinate system. The simulations describe a cascade of energy from a large-scale global driver to kinetic scales principally in the auroral acceleration region where electron inertial effects dominate and electron acceleration occurs. However, the fine scale transverse structuring of the upward current associated with this cascade appears to depend on the temperature of the ambient electron population suggesting that the ion acoustic scale length (which is dominant at higher altitudes) can influence the characteristics of the current fragmentation. Additionally, although the majority of the electron acceleration remains in the auroral acceleration region, the higher temperature cases appear to require a more extended (along the field line) source of electrons in order to carry the parallel current. We also consider the possible mechanisms by which coupling of large and small perpendicular scale lengths occurs and what effects the addition of ion gyro-radius physics may have on the characteristics of the acceleration and cascade.
Damiano Peter A.
Johnson Jesse
Wright Andrew. N.
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