The role of magnetic helicity in cosmic ray transport theory

Details The role of magnetic helicity in cosmic ray transport theory The role of magnetic helicity in cosmic ray transport theory

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981cicc.conf....5g&link_type=abstract

In its Contrib. to the 17th Intern. Cosmic Ray Conf. p 5-8 (SEE N81-25029 15-93)

Physics

Cosmic Rays, Diffusion Coefficient, Magnetic Fields, Solar Wind, Transport Theory, Pitch (Inclination), Voyager 2 Spacecraft

Scientific paper

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.

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