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Title: Modeling polar region atmospheric ionization induced by the giant solar storm on 20 January 2005
Authors: W. Mitthumsiri
A. Seripienlert
U. Tortermpun
P. S. Mangeard
A. Sáiz
D. Ruffolo
R. Macatangay
Mahidol University
Rajamangala University of Technology Thanyaburi (RMUTT)
National Astronomical Research Institute of Thailand
Dacon Inspection Services Co.
University of Delaware
Keywords: Agricultural and Biological Sciences;Earth and Planetary Sciences;Environmental Science
Issue Date: 1-Aug-2017
Citation: Journal of Geophysical Research: Space Physics. Vol.122, No.8 (2017), 7946-7955
Abstract: ©2017. American Geophysical Union. All Rights Reserved. Ionization in Earth's troposphere is mainly due to Galactic cosmic rays. Occasionally, solar storms produce intense relativistic ion beams that significantly increase such ionization. One of the largest recorded solar radiation storms, on 20 January 2005, resulted in up to 55-fold increases in the count rates of ground-based particle detectors in polar regions. We use McMurdo and Inuvik neutron monitor data to estimate accurate time profiles of ion energy spectra above the atmosphere at each location. Using data-driven atmospheric models, we perform Monte Carlo simulations of particle-air interactions and calculate atmospheric ionization and potential biological dosage versus altitude and time for each location. We found that if airplane passengers had traversed the south polar region, they could have been exposed to the typical annual cosmic radiation dosage at sea level within 1 h. These techniques can help evaluate possible influences of solar activity on atmospheric properties.
ISSN: 21699402
Appears in Collections:Scopus 2016-2017

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