Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..965m&link_type=abstract
Geophysical Research Letters, vol. 5, Nov. 1978, p. 965-968.
Astronomy and Astrophysics
Astronomy
7
Diffusion Coefficient, Radial Distribution, Solar Flares, Solar Protons, Anisotropic Media, Astronomical Spectroscopy, Solar Wind Velocity
Scientific paper
The paper presents anisotropy measurements of 1.3-2.3 MeV protons in the interplanetary space during recurrent events for which the radial intensity variation is measured within the radial range from about 0.3 to about 4 AU for the period from June, 1973 through April, 1976. The simultaneous measurements of the diffusive anisotropy and the radial gradient are used to make a direct estimate of the interplanetary radial diffusion coefficient, which is independent of any particular solution of the propagation equation. IMP 7 and 8 is required to be sunward of the earth and hence outside of the magnetosphere; if both spacecraft are sunward, measurements from the one farthest from the magnetosphere are used. The resulting values for the radial diffusivity coefficient near 1 AU lie in the range (3 to 9) x 10 to the 20th sq cm/sec, corresponding to scattering mean free paths between 0.03 and 0.1 AU with a mean of 0.06 AU.
Mewaldt Richard A.
Stone Edward C.
Vogt Rochus E.
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