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

被引：5
|
作者：
deKoning, CA
Mathews, T
机构：
[1] Department of Physics and Astronomy, University of Calgary, Calgary, Alta. T2N 1N4
来源：
CANADIAN JOURNAL OF PHYSICS | 1996年 / 74卷 / 5-6期
关键词：
D O I：
10.1139/p96-045
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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, lambda(parallel to). By fitting the well-known diffusion model to worldwide neutron monitor and muon telescope data, we calculate the value of lambda(parallel to) observed by each station. A plot of lambda(parallel to) 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 lambda(parallel to) is rigidity dependent. If we assume that lambda(parallel to) proportional to P-2-q 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.
引用
收藏
页码：290 / 294
页数：5
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