Pitch angle and radial diffusion of MeV protons in the outer magnetosphere

Details Pitch angle and radial diffusion of MeV protons in the outer magnetosphere Pitch angle and radial diffusion of MeV protons in the outer magnetosphere

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.1737s&link_type=abstract

Journal of Geophysical Research, vol. 81, Apr. 1, 1976, p. 1737-1743.

Physics

1

Atmospheric Diffusion, Earth Magnetosphere, Proton Scattering, Solar Protons, Diffusion Coefficient, Incident Radiation, Ion Cyclotron Radiation, Magnetic Storms, Pitch (Inclination), Ring Currents

Scientific paper

The paper calculates the latitude dependence of the field-line averaged pitch angle diffusion coefficient of energetic (1 MeV) solar protons in the magnetosphere. The calculations assume a distorted magnetosphere which incorporates solar wind compression, currents flowing in the neutral sheet and distributed ring current models. Proton scattering is due to gyroresonant interaction with ion cyclotron waves and Alfven waves. It is shown that the power levels of quiet time magnetospheric wave activity are not sufficient to cause strong pitch angle scattering but that the situation could change in magnetically disturbed periods. The associated radial diffusion coefficient was calculated from the pitch angle diffusion coefficient.

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