University of Oulu

Gil, Agnieszka; Asvestari, Eleanna; Kovaltsov, Gennady A.; Usoskin, Ilya 2017 Heliospheric modulation of galactic cosmic rays : effective energy of ground-based detectors. 35th international cosmic ray conference, ICRC2017, The astroparticle physics conference. 12-20 July 2017, Bexco, Busan, Korea, PoS(ICRC2017)032, https://pos.sissa.it/301/032/pdf

Heliospheric modulation of galactic cosmic rays : effective energy of ground-based detectors

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Author: Gil, Agnieszka1; Asvestari, Eleanna2; Kovaltsov, Gennady A.3;
Organizations: 1Institute of Mathematics and Physics, Siedlce University, Stanislawa Konarskiego 2, 08-110 Siedlce, Poland
2Department of Physics, University of Helsinki, FIN-00014 Finland and Space Climate Research Unit, University of Oulu, FIN-90014 Finland
3Ioffe Physical-Technical Institute, Politechnicheskaya st. 26, 194021 St. Petersburg, Russia
4Space Climate Research Unit and Sodankylä Geophysical Observatory, University of Oulu, FIN-90014 Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2017102650306
Language: English
Published: Sissa, 2017
Publish Date: 2017-10-26
Description:

Abstract

Variability of Galactic cosmic ray (GCR) is often expressed in terms of the modulation potential, which is typically assessed using energy-integrating ground-based detectors, such as neutron monitors (NMs) for the last decades or cosmogenic isotopes on the time scales of centuries and millennia. In order to estimate the energy dependence of the GCR variability we re-assess here the effective energy Eeff of each type of detector, which is defined so that the variability of the GCR particles at this energy is equal to that of the detector’s count rate. We found that Eeff is 11–12 GeV/nuc for the standard polar sea-level neutron monitor, but it is essentially smaller for cosmogenic isotopes, being 6–7 GeV/nuc for 14C and 5.5–6 GeV/nuc for 10Be, respectively. It is also discussed that this effective energy is robustly defined and is hardly dependent on the primary assumptions on the local interstellar spectrum (LIS) of GCR.

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Series: Pos proceedings of science
ISSN: 1824-8039
ISSN-E: 1824-8039
ISSN-L: 1824-8039
Article number: 032
Host publication: 35th international cosmic ray conference, ICRC2017, The astroparticle physics conference. 12-20 July 2017, Bexco, Busan, Korea
Conference: 35th International Cosmic Ray Conference – ICRC217-12-20 July, 2017, Bexco, Busan, Korea
Type of Publication: B3 Article in conference pro-ceedings
Field of Science: 115 Astronomy and space science
Subjects:
Funding: This work was supported by the Center of Excellence ReSoLVE (project No. 272157). A.G. acknowledges The Polish National Science Centre, decision number DEC-2016/22/E/HS5/00406.
Academy of Finland Grant Number: 272157
Detailed Information: 272157 (Academy of Finland Funding decision)
Copyright information: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).
  https://creativecommons.org/licenses/by-nc-nd/4.0/