3-D Anisotropies of Galactic Cosmic Rays: Theoretical Modeling

Details 3-D Anisotropies of Galactic Cosmic Rays: Theoretical Modeling 3-D Anisotropies of Galactic Cosmic Rays: Theoretical Modeling

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.3939k&link_type=abstract

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

Physics

Scientific paper

We report on 3-dimensional model calculations on the anisotropies of galactic cosmic rays that appear as solar and sidereal daily waves in earth based observations. Both the ecliptic and the sector-dependent North-South components of the anisotropy are considered. Particular attention is paid to the N-S component which is widely used to infer radial gradients and which cannot be properly addressed in 2-D models. We illustrate that the cross-field streaming due to latitudinal gradients may be considerable and the simple picture based solely on the B × U streaming may, in some instances, be misleading in inferring the radial gradient. We present 3-D simulations assuming different field models. The concept of upper limiting cutoff rigidity will be addressed. At high rigidities the diffusive description becomes inapplicable. An extension of numerical modeling is proposed for the regime of upper limiting cutoff.

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