Key Parameters Controlling the Nonlinear Cyclotron Instability for Whistler Mode Waves in the Magnetosphere

Details Key Parameters Controlling the Nonlinear Cyclotron Instability for Whistler Mode Waves in the Magnetosphere Key Parameters Controlling the Nonlinear Cyclotron Instability for Whistler Mode Waves in the Magnetosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2057h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2057

Physics

Plasma Physics

[7839] Space Plasma Physics / Nonlinear Phenomena, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Nonlinear amplification of whistler mode waves in the Earth's magnetosphere, due to gyroresonance with energetic electrons, has been investigated extensively with theory, experimental observations and computer simulations. It is generally accepted that non-linear effects are dominated by resonant and near-resonant electrons that are phase-trapped in the wave potential well. Numerous authors have investigated particle phase trapping in the non-linear growth process; however, the role of de-trapping has been comparatively ignored. We consider the effects of particle trapping and de-trapping on non-linear wave growth. To isolate the effects of particle trapping, we evaluate the phase-space hole model [Omura et al., JGR, 113, 2008] as the primary source of the resonant currents. To demonstrate the importance of particle de-trapping, we use an established hybrid code for VLF triggered emissions [Gibby et al., JGR, 113, 2008] to determine the physical location along the field line at which the transition from linear to nonlinear growth occurs. In particular, we show that temporal growth initiates off the equator, after particles escape from the wave potential well. That is, the de-trapping of resonant and near-resonant electrons is a crucial process for the initiation of the non-linear instability.

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