The Influence of Tilt Angle and Magnetic Field Variations on Cosmic ray Modulation

Details The Influence of Tilt Angle and Magnetic Field Variations on Cosmic ray Modulation The Influence of Tilt Angle and Magnetic Field Variations on Cosmic ray Modulation

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ssrv...97..343w&link_type=abstract

Space Science Reviews, v. 97, Issue 1/4, p. 343-347 (2001).

Physics

6

Scientific paper

The maximum inclination of the heliospheric current sheet (the tilt angle) and the magnitude B of the heliospheric magnetic field are often used to characterize cosmic ray (CR) modulation. The relevance of B is likely to be the coupling of the interplanetary diffusion coefficients K to the field magnitude in a relation K∝ B -n. In this paper we study the coupled influence of tilt angle and magnetic field variations on the modulation of cosmic rays at neutron monitor energies for the 1974 mini-cycle and for the onsets of solar cycles 21, 22, and 23. It is suggested that for A>0 polarity epochs, the sensitivity of the CR response to variations in B is partly controlled by the size of the tilt angle, α. The onsets of cycles 21 and 23 exhibit differences, related to phase differences in these parameters. A simple model is used to predict the CR response to variations in B.

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