Diffusion analysis of the GLE (ground-level enhancement) of September 29, 1989 Journal Article uri icon



  • On September 29, 1989, neutron monitors and muon telescopes around the world recorded a significant increase in their count rate. This ground-level enhancement affords a unique opportunity to study the rigidity dependence of the interplanetary scattering mean free path, [Formula: see text]. By fitting the well-known diffusion model to worldwide neutron monitor and muon telescope data, we calculate the value of [Formula: see text] observed by each station. A plot of [Formula: see text] observed by each station versus the mean rigidity of solar flare particles observed by each station (which ranges from 3–16 GV) clearly indicates that [Formula: see text] is rigidity dependent. If we assume that [Formula: see text] for P > 3 GV, where the power-law index q is a measure of the deviation from isotropic scattering (q = 1), then we find that q = 0.86 ± 0.03 at the time of this ground-level enhancement.

publication date

  • May 1, 1996

has restriction

  • closed

Date in CU Experts

  • June 11, 2021 5:27 AM

Full Author List

  • Koning CAD; Mathews T

author count

  • 2

Other Profiles

International Standard Serial Number (ISSN)

  • 0008-4204

Electronic International Standard Serial Number (EISSN)

  • 1208-6045

Additional Document Info

start page

  • 290

end page

  • 294


  • 74


  • 5-6