Effective rigidity of a polar neutron monitor for recording ground-level enhancements
|Author:||Koldobskiy, Sergey A.1,2; Kovaltsov, Gennady A.3; Usoskin, Ilya G.1,4|
1Space Climate Research Unit, University of Oulu, Finland
2National Research Nuclear University MEPhI, Moscow, Russia
3Ioffe Physical-Technical Institute, St. Petersburg, Russia
4Sodankylä Geophysical Observatory, University of Oulu, Finland
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2018080833519
|Publish Date:|| 2019-07-25
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.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
115 Astronomy and space science
This work was partially supported by the ReSoLVE Centre of Excellence (Academy of Finland, project 272157). S.A. Koldobskiy acknowledges grant no. MK-6160.2018.2 of the President of the Russian Federation and MEPhI Academic Excellence Project (contract 02.a03.21.0005).
|Academy of Finland Grant Number:||
272157 (Academy of Finland Funding decision)
© 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.