Abstract
Taking recent observations of the differential radial gradients and energy spectra of quiet time energetic particles of different energies and masses and over a large heliocentric radial distance from 0.3 to 18 AU into account, we show that the transport equation for these particles (Fokker‐Planck equation) reduces to a first‐order differential equation for the radial diffusion coefficient, which then can be solved analytically. For energetic helium and oxygen nuclei we then discuss the radial dependence of their diffusion coefficient.
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