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Published November 1978 | Published
Journal Article Open

The radial diffusion coefficient of 1.3 - 2.3 MeV protons in recurrent proton streams


Direct estimates of the radial diffusion coefficient κ_(rr) for 1.3-2.3 MeV protons in 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 κ_(rr) near 1 AU range from (3 to 9) × 10^(20) cm^²/sec, corresponding to scattering mean free paths between 0.03 and 0.1 AU.

Additional Information

© 1978 by the American Geophysical Union. Manuscript Accepted: 21 Sep 1978. Manuscript Received: 25 Jul 1978. We are grateful to H. S. Bridge and J. D. Sullivan for providing IMP-7 and 8 plasma data prior to publication. This work was supported in part by NASA under Contract NAS5-11066 and Grant NGR 05-002-160.

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