Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm33a0437o&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM33A-0437
Physics
2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2774 Radiation Belts, 2778 Ring Current
Scientific paper
Satellites in the radiation belt are regularly damaged by enhanced fluxes of relativistic electrons, however it is not yet understood how these electrons are able to become energized to relativitistic energies (>1 MeV). Ground-based magnetometer observations have shown that there is a strong correlation between ULF wave power in the Pc-5 frequency range and the flux of relativistic electrons. We examine how radiation belt electrons can be resonantly accelerated by the electric field of these Pc-5 standing ULF Alfven waves. In contrast to radial diffusion we show that ULF waves may cause the inward radial transport of radiation belt electrons. The guided Alfven waves considered here are dominantly poloidal mode waves with moderate azimuthal wave numbers (m~20). We show that it is possible for these poloidal FLR's to be excited by ring current protons. Consequently, it may be possible for the electrons to be energized by the ring current protons via the intermediary action of ULF waves. We also examine how the maximum amount of energy gained by the electrons depends on how close the resonant electrons are to the position of the FLR. We show that electrons which are in resonance with the wave at the position of the FLR may not experience the largest increase in energy. In addition to the spatial variation of the waves' electric field, the acceleration of the electrons by the wave is strongly dependent on how the amplitude of the waves' equatorial electric field varies with time. We find that when the electric field amplitude of the wave remains fixed with time then the electrons are accelerated and decelerated equal amounts by the wave with no net change in the electrons energy. However, if we allow the amplitude of the wave to decay with time then it is possible for the wave to permanently energize the electrons and move them onto lower L-shells
Mann Ian
Ozeke Louis
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