Physics – Plasma Physics
Scientific paper
2011-10-17
Physics
Plasma Physics
13 pages, 9 figures, 4 tables
Scientific paper
10.1063/1.3692092
We consider the weak turbulence of whistler waves in the in low-\beta\ inner magnetosphere of the Earth. Whistler waves with frequencies, originating in the ionosphere, propagate radially outward and can trigger nonlinear induced scattering by thermal electrons provided the wave energy density is large enough. Nonlinear scattering can substantially change the direction of the wave vector of whistler waves and hence the direction of energy flux with only a small change in the frequency. A portion of whistler waves return to the ionosphere with a smaller perpendicular wave vector resulting in diminished linear damping and enhanced ability to pitch-angle scatter trapped electrons. In addition, a portion of the scattered wave packets can be reflected near the ionosphere back into the magnetosphere. Through multiple nonlinear scatterings and ionospheric reflections a long-lived wave cavity containing turbulent whistler waves can be formed with the appropriate properties to efficiently pitch-angle scatter trapped electrons. The primary consequence on the Earth's radiation belts is to reduce the lifetime of the trapped electron population.
Crabtree Chris
Galinsky Vitaly
Ganguli Gurudas
Mithaiwala Manish
Rudakov Leonid
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