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Temporal and spatial evolution of the solar energetic particle event on 20 January 2005 and resulting radiation doses in aviation

Matthiä, Daniel and Heber, B. and Reitz, Günther and Meier, Matthias and Sihver, L. and Berger, Thomas and Herbst, K. (2009) Temporal and spatial evolution of the solar energetic particle event on 20 January 2005 and resulting radiation doses in aviation. Journal of Geophysical Research, 114 (A08104). American Geophysical Union. DOI: 10.1029/2009JA014125.

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Abstract

The solar energetic particle event on 20 January 2005 was one of the largest ground level events ever observed. Neutron monitor stations in the Antarctic recorded count rate increases of several thousand percent caused by secondary energetic particles, and it took more than 36 h to return to background level. Such huge increases in high energetic solar cosmic radiation on the ground are obviously accompanied by considerable changes in the radiation environment at aviation altitudes. Measurements of 28 neutron monitor stations were used in this work to numerically approximate the primary solar proton spectra during the first 12 h of the event by minimizing the differences between measurements and the results of Monte-Carlo calculated count rate increases. The primary spectrum of solar energetic protons was approximated by a power law in rigidity and a linear angular distribution. The incoming direction of the solar energetic particles was determined and compared to the interplanetary magnetic field direction during the event. The effects on the radiation exposure at altitudes of about 12 km during that time were estimated to range from none at low latitudes up to almost 2 mSv/h for a very short time in the Antarctic region and about 0.1 mSv/h at high latitudes on the Northern Hemisphere. After 12 h, dose rates were still increased by 50% at latitudes above 60° whereas no increases at all occurred at latitudes below 40° during the whole event.

Document Type:Article
Title:Temporal and spatial evolution of the solar energetic particle event on 20 January 2005 and resulting radiation doses in aviation
Authors:
AuthorsInstitution or Email of Authors
Matthiä, DanielRadiation Biology Department, German Aerospace Center, Cologne, Germany; Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, Kiel, Germany
Heber, B.Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, Kiel, Germany
Reitz, GüntherUNSPECIFIED
Meier, MatthiasUNSPECIFIED
Sihver, L. Department of Nuclear Engineering, Chalmers University of Technology, Gothenburg, Sweden
Berger, ThomasUNSPECIFIED
Herbst, K. Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, Kiel, Germany
Date:2009
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:114
DOI:10.1029/2009JA014125
Publisher:American Geophysical Union
Series Name:Space Physics
Status:Published
Keywords:solar energetic particle event
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Strahlenbiologie (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kerstin Kopp
Deposited On:15 Dec 2009 09:37
Last Modified:23 Jan 2014 11:36

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