Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2086c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2086
Physics
Plasma Physics
[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [7863] Space Plasma Physics / Turbulence, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
In the Earth's dipole magnetic field whistler-mode waves with frequencies (4-12 kHz), relevant to pitch angle scattering of relativistic electrons, originating in the ionosphere quickly propagate toward the hydrogen lower-hybrid resonant surface in the magnetosphere. The perpendicular wave-vector increases such that wave packets become quasi-electrostatic, experience large Landau and collisional damping, and quickly become less effective at pitch angle scattering. Recently Ganguli et al. [2010] showed that through nonlinear (NL) induced scattering by thermal electrons in low beta plasmas the direction of the wave-vector of whistler-mode waves can change substantially with only a small change in the frequency. Here we apply this mechanism to demonstrate that when the turbulent whistler-mode energy density is large enough, NL scattering allows a portion of whistler-mode waves to return toward the ionosphere and reduces the perpendicular wave-vector such that the corresponding linear damping is reduced and the wave's ability to pitch angle scatter relativistic electrons is revived. Near the ionosphere wave packets may again be reflected into the magnetosphere at an oxygen lower-hybrid resonant surface. Through multiple NL scatterings and ionospheric reflections a long-lived wave cavity may be formed with the appropriate properties to efficiently pitch-angle scatter trapped relativistic electrons. * Supported by ONR.
Crabtree C. E.
Galinsky Vitaly
Ganguli Gurudas
Mithaiwala Manish
Rudakov Leonid
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