Neutron Monitors and Cosmogenic Isotopes as Cosmic Ray Energy-Integration Detectors : Effective Yield Functions, Effective Energy, and Its Dependence on the Local Interstellar Spectrum

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Asvestari , E , Gil , A , Kovaltsov , G A & Usoskin , I G 2017 , ' Neutron Monitors and Cosmogenic Isotopes as Cosmic Ray Energy-Integration Detectors : Effective Yield Functions, Effective Energy, and Its Dependence on the Local Interstellar Spectrum ' , Journal of geophysical research. Space physics , vol. 122 , no. 10 , pp. 9790 - 9802 . https://doi.org/10.1002/2017JA024469

Title: Neutron Monitors and Cosmogenic Isotopes as Cosmic Ray Energy-Integration Detectors : Effective Yield Functions, Effective Energy, and Its Dependence on the Local Interstellar Spectrum
Author: Asvestari, Eleanna; Gil, Agnieszka; Kovaltsov, Gennady A.; Usoskin, Ilya G.
Contributor organization: Department of Physics
Space Physics Research Group
Date: 2017-10-13
Language: eng
Number of pages: 13
Belongs to series: Journal of geophysical research. Space physics
ISSN: 2169-9380
DOI: https://doi.org/10.1002/2017JA024469
URI: http://hdl.handle.net/10138/307197
Abstract: The method of assessment of galactic cosmic rays (GCR) variability over different timescales, using energy-integrating ground-based detectors such as a neutron monitor and cosmogenic isotopes 10Be and 14C stored in natural archives is revisited here. The effective yield functions for cosmogenic 14C (globally mixed in the atmosphere) and 10Be (realistically deposited in the polar region) are calculated and provided, in a tabulated form, in the supporting information. The effective energy of a detector is redefined so that the variability of the flux of GCR particles at this energy is equal to that of the detector's count rate. The effective energy is found as 11–12 GeV/nucleon for the standard polar neutron monitor, and 6–7 GeV/nucleon and 5.5–6 GeV/nucleon for 14C and 10Be, respectively. New “calibration” relations between the force-field modulation potentials, based on different models of local interstellar spectra (LIS) are provided. While such relations are typically based on refitting the modeled cosmic ray spectra with a prescribed LIS model, the method introduced here straightforwardly accounts for the exact type of the detector used to assess the spectrum. The relations are given separately for ground-based neutron monitors and cosmogenic isotopes. This work allows for harmonization of different works related to variability of galactic cosmic ray flux in the vicinity of Earth, on long-term scale.
Subject: 115 Astronomy, Space science
Neutron Monitors
Cosmic Rays
cosmogenic isotopes C-14 and Be-10
Peer reviewed: Yes
Rights: cc_by_nc_sa
Usage restriction: openAccess
Self-archived version: publishedVersion


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