University of Oulu

Koldobskiy, S. A., Kovaltsov, G. A., & Usoskin, I. G. (2018). A solar cycle of cosmic ray fluxes for 2006–2014: Comparison between PAMELA and neutron monitors. Journal of Geophysical Research: Space Physics, 123, 4479–4487.

A solar cycle of cosmic ray fluxes for 2006–2014 : comparison between PAMELA and neutron monitors

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Author: Koldobskiy, Sergey A.1,2; Kovaltsov, Gennady A.3; Usoskin, Ilya G.1
Organizations: 1Space Climate Research unit and Sodankylä Geophysical Observatory University of Oulu, Oulu, Finland
2National Research Nuclear University, Moscow Engineering Physics Institute, Moscow, Russia
3Ioffe Physical-Technical Institute, St. Petersburg, Russia
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.3 MB)
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Language: English
Published: American Geophysical Union, 2018
Publish Date: 2018-08-07


A comparison of cosmic proton spectra directly measured by the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) experiment during 2006–2014 with data of polar neutron monitors for the same time interval is presented. It is shown that the measured spectra are well described by the force-field model for the modulation potential range 350–750 MV. The obtained modulation potential agrees with that calculated from the data of the world neutron monitor network for low solar activity between 2006 and 2012 but diverges during the maximum of solar cycle. The empirical relation between the modulation potential and the (inverted) neutron monitor count rate appears somewhat steeper than the modeled one, as confirmed also by data from fragmentary balloon-borne measurements. A reason for the discrepancy is unclear and calls for additional study using independent data sets.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 123
Pages: 4479 - 4487
DOI: 10.1029/2018JA025516
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This work was partially supported by the ReSoLVE Centre of Excellence (Academy of Finland, project 272157). S. A. K. acknowledges support from the Russian Foundation for Basic Research (grant 18-32-00062) and MEPhI Academic Excellence Project (contract 02.a03.21.0005).
Academy of Finland Grant Number: 272157
Detailed Information: 272157 (Academy of Finland Funding decision)
Copyright information: © 2018 American Geophysical Union. All Rights Reserved.