Ambiguity in Determining the Diffusion Coefficient from Shock-Associated Energetic Particle Increases |
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| Authors: | Savopulos M Quenby J J |
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| Institution: | (1) Astrophysics Group, Blackett Laboratory, Imperial College of Science, Technology and Medicine, Prince Consort Rd., London, SW7 2BZ, U.K. |
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| Abstract: | A numerical solution to the Fisk and Lee (1980) equations for the particle intensity upstream of a corotating interplanetary shock is considered for the November 1991 event observed at Ulysses. A numerically derived parallel diffusion coefficient is available for this region (Quenby et al., 1993), based upon in-situ magnetometer data. Fitting the transport equations solution to the upstream energetic particle distribution function, employing a radial diffusion coefficient  = 0  r , where r and are, respectively, radial distance from the Sun and particle velocity, and with 0 fixed from the magnetometer derived coefficient yielded a range of statistically acceptable values of (, ). These ran from (0.5, 0.0) to (1.8, 1.6) along a thin strip of — space, hence demonstrating the improbability that the velocity and radial dependence of the particle diffusion can be fixed from such particle and magnetic field data alone. |
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