NDLI: Ambiguity in Determining the Diffusion Coefficient from Shock-Associated Energetic Particle Increases

Content Provider	Springer Nature Link
Author	Savopulos, M. Quenby, J. J.
Copyright Year	1998
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 К = К$_{0}$υ$^{α}$ r$^{∈}$, where r and υ are, respectively, radial distance from the Sun and particle velocity, and with К$_{0}$ fixed from the magnetometer derived coefficient yielded a range of statistically acceptable values of (α, ∈). These ran from (0.5, 0.0) to (1.8, 1.6) along a thin strip of α — ∈ 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.
Starting Page	479
Ending Page	485
Page Count	7
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	180
Issue Number	1-2
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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Ambiguity in Determining the Diffusion Coefficient from Shock-Associated Energetic Particle Increases