Diffusion analysis of the GLE (ground-level enhancement) of September 29, 1989.

Details Diffusion analysis of the GLE (ground-level enhancement) of September 29, 1989. Diffusion analysis of the GLE (ground-level enhancement) of September 29, 1989.

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996cajph..74..290d&link_type=abstract

Can. J. Phys., Vol. 74, No. 5 - 6, p. 290 - 294

Physics

1

Cosmic Rays: Muons

Scientific paper

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, λ∥. By fitting the well-known diffusion model to worldwide neutron monitor and muon telescope data, the authors calculate the value of λ∥ observed by each station. A plot of λ∥ 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 λ∥ is rigidity dependent. If one assumes that λ∥ ∝ P2-q for P > 3 GV, where the power-law index q is a measure of the deviation from isotropic scattering (q = 1), then one finds that q = 0.86±0.03 at the time of this ground-level enhancement.

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