Combined radial diffusion and adiabatic transport of radiation belt electrons with arbitrary pitch angles

Details Combined radial diffusion and adiabatic transport of radiation belt electrons with arbitrary pitch angles Combined radial diffusion and adiabatic transport of radiation belt electrons with arbitrary pitch angles

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11510249s&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A10, CiteID A10249

Physics

4

Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Forecasting (1922, 7924, 7964), Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Energetic Particles: Trapped, Magnetospheric Physics: Magnetosphere: Inner

Scientific paper

Storm-time radial diffusion of radiation belt electrons with arbitrary pitch angles in a time-varying geomagnetic field is simulated based on our recently developed STEERB code. In particular, the fully adiabatic response of energetic electrons to the variation of geomagnetic field is self-consistently incorporated. Simulation results show that the outward adiabatic transport (instead of outward radial diffusion) is primarily responsible for the main phase depletion of energetic electron fluxes at large pitch angles beyond 5Re (Re is the Earth's radius). However, combined radial diffusion and adiabatic transport contributes insignificantly to the main phase depletion of energetic electron fluxes within 5Re, or the recovery phase enhancement of energetic electron fluxes in the outer radiation belt. Moreover, the simulation with both radial diffusion and adiabatic transport shows that the pitch angle distribution of energetic outer zone electrons can evolve from a rounded 90°-peaked distribution to a butterfly-shaped distribution during the main phase, and back to a rounded 90°-peaked distribution during the recovery phase. Such essential changes of pitch angle distribution may further affect the efficiency of other local loss and energization mechanisms.

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