J. Space Weather Space Clim.
Volume 7, 2017
Measurement, Specification and Forecasting of the Solar Energetic Particle Environment and GLEs
|Number of page(s)||17|
|Published online||01 November 2017|
Assessment of spectral and angular characteristics of sub-GLE events using the global neutron monitor network
Space Climate Research Unit, University of Oulu,
2 Sodankylä Geophysical Observatory (Oulu Unit) University of Oulu, Oulu, Finland
* Correspondence: email@example.com
Accepted: 23 September 2017
New recently installed high-altitude polar neutron monitors (NMs) have made the worldwide NM network more sensitive to strong solar energetic particle (SEP) events, registered at ground level, namely ground-level enhancement (GLE) events. The DOMC/B and South Pole NMs in addition to marginal cut-off rigidity also possess lower atmospheric cut-off compared to the sea level. As a result, the two high-altitude polar NM stations are able to detect lower energy SEP events, which most likely would not be registered by the other (near sea level) NMs. Here, we consider several candidates for such type of events called sub-GLEs. Using the worldwide NM database (NMDB) records and an optimization procedure combined with simulation of the global NM network response, we assess the spectral and angular characteristics of sub-GLE particles. With the estimated spectral characteristics as an input, we evaluate the effective dose rate in polar and sub-polar regions at typical commercial flight altitude. Hence, we demonstrate that the global NM network is a useful tool to estimate important space weather effects, e.g., the aircrew exposure due to cosmic rays of galactic and/or solar origins.
Key words: SEP / GLE and sub-GLE events / neutron monitor network / spectral and angular characteristics of SEPs / radiation environment
© A. Mishev et al., Published by EDP Sciences 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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