The effective energy for neutron monitors and cosmogenic isotopes-redefined concept
Abstract
Cosmic ray variability is often described in terms of the modulation potential (φ) changes. Based on measurements of ground-based energy-integrating detectors, such as neutron monitors for the recent decades, and by cosmogenic isotopes stored in natural archives for the millennial timescale, variability of φ can be reconstructed. Here we defined the effective energy of an energy-integrating detector as energy at which the cosmic ray flux changeability is straightforward proportional to that of the detector's response. We calculated that the effective energy for the standard sea-level polar neutron monitor is around 11-12 GeV/nucleon, while for cosmic ray reconstruction based on cosmogenic isotopes it is around 6-7 GeV/nucleon and 5.5-6 GeV/nucleon for 14C data and 10Be, respectively. We compared results based on different models of local interstellar spectrum (LIS) of galactic cosmic rays, showing that the effective energy is determined robustly against the particular LIS model.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E1207G