Effective rigidity of a polar neutron monitor for recording ground-level enhancements
Koldobskiy, Sergey A.; Kovaltsov, Gennady A.; Usoskin, Ilya G. (2018-07-25)
Koldobskiy, S.A., Kovaltsov, G.A. & Usoskin, I.G. Sol Phys (2018) 293: 110. https://doi.org/10.1007/s11207-018-1326-1
© Springer Nature B.V. 2018. This is a post-peer-review, pre-copyedit version of an article published in Solar Physics. The final authenticated version is available online at: http://dx.doi.org/10.1007/s11207-018-1326-1.
The “effective” rigidity of a neutron monitor for a ground-level enhancement (GLE) event is defined so that the event-integrated fluence of solar energetic protons with rigidity above it is directly proportional to the integral intensity of the GLE as recorded by a polar neutron monitor, within a wide range of solar energetic-proton spectra. This provides a direct way to assess the integral fluence of a GLE event based solely on neutron-monitor data. The effective rigidity/energy was found to be 1.13 – 1.42 GV (550 – 800 MeV). A small model-dependent, systematic uncertainty in the value of the effective rigidity is caused by uncertainties in the low-energy range of the neutron-monitor yield function, which requires more detailed computations of the latter.
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