Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42b04s&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM42B-04
Physics
2744 Magnetotail, 2764 Plasma Sheet, 2788 Storms And Substorms, 7835 Magnetic Reconnection
Scientific paper
We investigate the excitation of electrostatic lower hybrid waves in the magnetic field reversal region of the plasma sheet using a gyro-kinetic description for electrons and Vlasov's equation for ions. Considering a two-dimensional magnetic field configuration for the tail, we examine the effects of curvature drift and gradient-B resonances and derive an eigenvalue differential equation for studying the electrostatic wave characteristics. We show that the gradient in the x-component of the equilibrium magnetic field drives the electrostatic mode unstable in the field reversal region. The growth rate solutions for various tail parameters are plotted as a function of wavelengths. This work highlights a possible dissipation mechanism for triggering magnetic reconnection processes and subsequent substorm onsets.
Fairfield Donald H.
Sundaram A. K.
Viñas Adolfo F.
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