Challenges for an ab initio Theory of Cosmic Ray Modulation

Details Challenges for an ab initio Theory of Cosmic Ray Modulation Challenges for an ab initio Theory of Cosmic Ray Modulation

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3670p&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

2

Scientific paper

Recent efforts to improve and complete modulation theory are described, emphasizing factors that arise in attempts to understand the diffusion tensor based upon turbulence theory and the theory of charged particle scattering. Direct numerical solutions of the transport equations are used to study a new perpendicular diffusion formalism that can smoothly vary between the field line random walk limit and a recent treatment based upon the Taylor-Green-Kubo equation. Using this new formalism we show that modulation is strongly influenced by the radial variation of the correlation length. This variation is still poorly understood, in part owing to the uncertain impact of pickup ion driven turbulence in the outer heliosphere.

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