The radial diffusion coefficient of 1.3- 23 MeV protons in recurrent proton streams

R. A. Mewaldt, E. C. Stone, R. E. Vogt
1978 Geophysical Research Letters  
Direct estimates of the radial diffusion coefficient • for 1.3-2.3 MeV protons in rr interplanetary space are made by comparing simultaneous observations of the diffusive anisotropy and radial gradient of these particles within recurrent streams. The 1.3-2.3 MeV proton anisotropy has been measured at 1 AU by the Caltech Electron/Isotope Spectrometers on IMP-7 and 8 during recurrent proton events for which measurements of the radial intensity gradient have been reported. The resulting values for
more » ... • near 1 AU range from (3 to 9) x 1020 cm2/sec, rr corresponding to scattering mean free paths between 0.03 and 0.1 AU.
doi:10.1029/gl005i011p00965 fatcat:dyqfgeq75vchvovvh56ikm7mxm