Magnetic field fluctuation geometry as a possible solution to the proton mean free path discrepancy problem

Details Magnetic field fluctuation geometry as a possible solution to the proton mean free path discrepancy problem Magnetic field fluctuation geometry as a possible solution to the proton mean free path discrepancy problem

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291l..35j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. L35-L38

Astronomy and Astrophysics

Astrophysics

6

Interplanetary Magnetic Fields, Mean Free Path, Nonlinearity, Proton Scattering, Solar Protons, Solar Wind, Correlation, Cosmic Rays, Magnetohydrodynamic Waves, Models, Pitch (Inclination), Turbulence

Scientific paper

Phenomenological values of the mean free path of solar energetic protons in the solar wind are compared to the values derived from measurements of the interplanetary magnetic fields by a standard quasilinear theory (QLT) for a slab geometry of the fields. For strongly scattering events the quality of QLT decreases systematically if the angle between the directions of the mean magnetic field and the solar wind velocity increases. We show that this surprising result can be interpreted as evidence for magnetic fluctuations with oblique wave number vectors, i.e. for field geometries differing from the slab model. We compare results from the standard slab model with those from three models with more complicated fluctuation geometries. Best results are obtained for a model with a 2D component of the fluctuations and for one with radially oriented wave vectors.

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