Space Science Reviews

, Volume 97, Issue 1, pp 343–347

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

  • G. Wibberenz
  • H.V. Cane
  • I.G. Richardson
  • T.T. von Rosenvinge
Article

DOI: 10.1023/A:1011849605820

Cite this article as:
Wibberenz, G., Cane, H., Richardson, I. et al. Space Science Reviews (2001) 97: 343. doi:10.1023/A:1011849605820

Abstract

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 KB−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.

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • G. Wibberenz
    • 1
  • H.V. Cane
    • 2
  • I.G. Richardson
    • 2
  • T.T. von Rosenvinge
    • 2
  1. 1.IEAPUniversity of KielKielGermany
  2. 2.LHEA, NASA/GSFCGreenbeltU.S.A