LANDAU DAMPING AND GROWTH OF PROTON-CYCLOTRON TURBULENCE BY THE ELECTRON DISTRIBUTION FUNCTION IN DOWNWARD AURORAL-CURRENT REGIONS

Details LANDAU DAMPING AND GROWTH OF PROTON-CYCLOTRON TURBULENCE BY THE ELECTRON DISTRIBUTION FUNCTION IN DOWNWARD AURORAL-CURRENT REGIONS LANDAU DAMPING AND GROWTH OF PROTON-CYCLOTRON TURBULENCE BY THE ELECTRON DISTRIBUTION FUNCTION IN DOWNWARD AURORAL-CURRENT REGIONS

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41a1690j&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM41A-1690

Physics

[2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

We have identified two FAST satellite passes in downward, field-aligned, auroral-current regions, where Landau damping and Landau growth of proton cyclotron turbulence is correlated with the shape of the electron distribution function in velocity space. Recently, and for the first time, we have developed and published a new kinetic and multi-moment fluid, anomalous transport theory that contains the effect of electrostatic turbulence in inhomogeneous, non-uniformly magnetized plasmas [1, 2]. We apply the new theory to a downward current sheet and show that an electron, bump-on-tail, ion-cyclotron instability occurs, where the time-asymptotic state for the spectral density of the turbulent electric field fluctuates on an intermediate time scale between maximum and minimum values; and that these maximum and minimum values are, in turn, correlated with fluctuations in the electron distribution function between unstable and stable configurations, respectively. Given enough time, the ions will heat up and the electron, bump-on-tail, ion-cyclotron instability will shut off. [1] J. R. Jasperse et al. (2006), Phys. Plasmas 13, 072903, and [2] J. R. Jasperse et al. (2006), Phys. Plasmas 13, 112902.

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