Dependence of pitch-angle scattering rates and loss timescales on the magnetic field model

Details Dependence of pitch-angle scattering rates and loss timescales on the magnetic field model Dependence of pitch-angle scattering rates and loss timescales on the magnetic field model

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3705105o&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 5, CiteID L05105

Physics

Plasma Physics

12

Magnetospheric Physics: Energetic Particles: Precipitating, Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Magnetic Storms And Substorms (7954), Interplanetary Physics: Energetic Particles (7514)

Scientific paper

Radiation belt diffusion codes require, as inputs, precomputed scattering rates, which are currently bounce-averaged in the dipole magnetic field. We present the results of computations of the bounce-averaged quasi-linear pitch-angle diffusion coefficients of relativistic electrons for various distances and two MLT in the Tsyganenko 89c magnetic field model. The coefficients were computed for quiet and storm-time conditions. We compare scattering rates bounce-averaged in a non-dipole field model with those in the dipole field. We demonstrate that on the day side the effects of taking into account a realistic magnetic field are negligible at distances less than six Earth radii. On the night side diffusion coefficients may significantly depend on the assumed field model. Pitch-angle scattering rates calculated in the non-dipole field can explain the often observed night-side chorus induced precipitation. The physical explanation for the changes of pitch-angle scattering rates with the field model is presented and discussed.

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