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 |
Total number of downloads: Loading...
Files | Size | Format | View |
---|---|---|---|
2017JA024469.pdf | 789.3Kb |
View/ |