Kinetic Treatment of Electrostatic Bounce Instabilities in a 2D Current Sheet

Details Kinetic Treatment of Electrostatic Bounce Instabilities in a 2D Current Sheet Kinetic Treatment of Electrostatic Bounce Instabilities in a 2D Current Sheet

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41b2036f&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM41B-2036

Physics

[2764] Magnetospheric Physics / Plasma Sheet, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2790] Magnetospheric Physics / Substorms

Scientific paper

In the general context of understanding the possible destabilization of the magnetotail before a substorm, we propose a kinetic model for electrostatic ballooning-type instabilities in resonant interaction with trapped particles moving in a 2D magnetic configuration. Using a quasi-parabolic equilibrium state (as Lembège and Pellat's model), the linearized gyrokinetic Vlasov equation is solved for electrostatic fluctuations with period of the order of the electron bounce period. The particle motion is restricted to its first Fourier component along the magnetic field and this allows the complete time integration of the non local perturbed distribution functions. The dispersion relation for electrostatic modes is finally obtained through the quasineutrality condition. A numerical integration over the constants of the particle motion (E, μ) is then performed. This work follows the initial investigation by Tur et al. 2010 but it includes the drift motion of the particles along the dawn-dusk direction, which may better describe the real situation. Unstable electrostatic modes are found whenever the temperature ratio Te/Ti is close to 1 with growth rate of the order of the minute. These modes extend more widely in Fourier space as the magnetic geometry is stretched.

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