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Energy dependence of cumulative suprathermal and energetic particle fluence plots

Kiraly, P. and Mason, G. M. and Mewaldt, R. A. and Posner, A. and Rodriquez-Posner, J. (2005) Energy dependence of cumulative suprathermal and energetic particle fluence plots. In: Proceedings of the 29th International Cosmic Ray Conference. Vol.1. Tata Institute of Fundamental Research , Pune, India, pp. 71-74.

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Suprathermal and energetic particle flux variability can be statistically characterized in a number of ways. As time histories of flux integrals (cumulative fluences) are relevant both for practical reasons (radiation effects) and for a better understanding of the production and propagation processes, simple quantitative methods are of some interest. Previous studies (e.g. Mewaldt et al., 2001)[1] showed that the character of cumulative fluence plots changed substantially with energy. While at several MeV/nuc a few solar particle events predominate, at much lower energies similar contributions from many separate events of various origins were found. We shall now use a simple parametric method for comparisons, and mention some other possibilities. As in the Kolmogorov hypothesis test, the maximum vertical distance of normalized cumulative plots from the straight line valid for a constant flux will be shown to be useful. Small values of that parameter (called K here for Kolmogorov) indicate variation in many small steps, while large K-values correspond to the dominance of a small number of large events. Below a few MeV/nuc K-parameters will be shown to decrease with decreasing energies. Extrapolations to small energies will be mainly discussed.

Item Type:Book Section
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URLURL TypeDescription
Mason, G. M.0000-0003-2169-9618
Mewaldt, R. A.0000-0003-2178-9111
Additional Information:Copyright TATA Institute of Fundamental Research
Group:Space Radiation Laboratory
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Space Radiation Laboratory2005-10
Record Number:CaltechAUTHORS:20150406-144458133
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56396
Deposited By: Deborah Miles
Deposited On:22 Apr 2015 01:16
Last Modified:22 Nov 2019 09:58

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