The role of magnetic helicity in cosmic ray transport theory

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1981ICRC____3__294G.pdf (342.04 KB)

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https://ntrs.nasa.gov/citations/19810016496

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http://hdl.handle.net/11603/30490

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UMBC Goddard Planetary Heliophysics Institute (GPHI)

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Author/Creator ORCID

https://orcid.org/0000-0002-5317-988X

Date

1981-04-01

Type of Work

conference papers and proceedings
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Program

Citation of Original Publication

Goldstein, M. L., and W. H. Matthaeus. “The Role of Magnetic Helicity in Cosmic Ray Transport Theory,” 1981. https://ntrs.nasa.gov/citations/19810016496.

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This is a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

The pitch angle scattering of cosmic ray is modified greatly if the medium through which they propagate contains significant amounts of magnetic helicity. When helicity is present in the medium, the often used expression for the pitch angle diffusion coefficient derived from quasilinear theory must be modified. These modifications are illustrated for slab and isotropic symmetries. Using measurements of helicity in the solar wind determined from single point measurements of the correlation tensor of magnetic fluctuations obtained from Voyager 2, the effects of the observed helicity on both the pitch angle and spatial diffusion coefficients are estimated.