University of Oulu

Mishev, A. & Usoskin, I. Sol Phys (2016) 291: 1225.

Analysis of the ground-level enhancements on 14 July 2000 and 13 December 2006 using neutron monitor data

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Author: Mishev, A.1; Usoskin, I.1,2
Organizations: 1ReSolve Center of Excellence, University of Oulu, Oulu, Finland
2Sodankylä Geophysical Observatory (Oulu unit), University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.5 MB)
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Language: English
Published: Springer Nature, 2016
Publish Date: 2017-03-22


On the basis of neutron monitor data, we estimate the energy spectrum, anisotropy axis direction, and pitch-angle distribution of solar energetic particles during two major ground-level enhancements (GLE 59 on 14 July 2000 and GLE 70 on 13 December 2006). For the analysis we used a newly computed neutron monitor yield function. The method consists of several consecutive steps: definition of the asymptotic viewing cones of neutron monitor stations considered for the data analysis by computing the cosmic ray particle propagation in a model magnetosphere with the MAGNETOCOSMICS code, computing the neutron monitor model responses, and deriving the solar energetic particle characteristics on the basis of inverse problem solution. The pitch-angle distribution and rigidity spectrum of high-energy protons are obtained as a function of time in the course of ground-level enhancements. A comparison with previously reported results is performed and reasonable agreement is achieved. A discussion of the obtained results is included.

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Series: Solar physics
ISSN: 0038-0938
ISSN-E: 1573-093X
ISSN-L: 0038-0938
Volume: 291
Issue: 4
Pages: 1225 - 1239
DOI: 10.1007/s11207-016-0877-2
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This work was supported by the Center of Excellence ReSoLVE (project No. 272157).
Academy of Finland Grant Number: 272157
Detailed Information: 272157 (Academy of Finland Funding decision)
Copyright information: © Springer Science+Business Media Dordrecht 2016. Published in this repository with the kind permission of the publisher.