Analysis of the ground-level enhancements on 14 July 2000 and 13 December 2006 using neutron monitor data
|Author:||Mishev, A.1; Usoskin, I.1,2|
1ReSolve Center of Excellence, University of Oulu, Oulu, Finland
2Sodankylä Geophysical Observatory (Oulu unit), University of Oulu, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 0.5 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe201708118088
|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.
An erratum to this article can be found at http://dx.doi.org/10.1007/s11207-016-0937-7
|Pages:||1225 - 1239|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
115 Astronomy and space science
This work was supported by the Center of Excellence ReSoLVE (project No.
|Academy of Finland Grant Number:||
272157 (Academy of Finland Funding decision)
© Springer Science+Business Media Dordrecht 2016. Published in this repository with the kind permission of the publisher.