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The ground level event 70 on December 13th, 2006 and related effective doses at aviation altitudes

Matthiä, Daniel and Heber, Bernd and Reitz, Günther and Sihver, Lembit and Berger, Thomas and Meier, Matthias (2009) The ground level event 70 on December 13th, 2006 and related effective doses at aviation altitudes. Radiation Protection Dosimetry, 136 (4), pp. 304-310. Oxford University Press. DOI: 10.1093/rpd/ncp141 . ISSN Online 1742-3406 Print 0144-8420.

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Abstract

The 70th ground level event in the records of the Neutron Monitor network occurred on 13 December 2006 reaching a maximum count rate increase at the Oulu station of more than 90 % during the 5 min interval 3.05–3.10 UTC. Thereafter, count rates gradually decreased registering increases of a few per cent above the galactic cosmic ray background after a few hours. The primary proton spectrum during the first 6 h after the onset of the event is characterised in this work by fitting the energy and angular distribution by a power law in rigidity and a linear dependence in the pitch angle using a minimisation technique. The results were obtained by analysing the data from 28 Neutron Monitor stations. At very high northern and southern latitudes, the effective dose rates were estimated to reach values of 25–30 μSv/h at atmospheric depth of 200 g/cm² during the maximum of the event. The increase in effective dose during north atlantic and polar flights was estimated to be in the order of 20 %.

Document Type:Article
Title:The ground level event 70 on December 13th, 2006 and related effective doses at aviation altitudes
Authors:
AuthorsInstitution or Email of Authors
Matthiä, Daniel UNSPECIFIED
Heber, Bernd Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität Kiel, Kiel, Germany
Reitz, Günther UNSPECIFIED
Sihver, Lembit Nuclear Engineering, Chalmers University of Technology, Göteborg, Sweden
Berger, Thomas UNSPECIFIED
Meier, Matthias UNSPECIFIED
Date:2009
Journal or Publication Title:Radiation Protection Dosimetry
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:136
DOI:10.1093/rpd/ncp141
Page Range:pp. 304-310
Publisher:Oxford University Press
ISSN:Online 1742-3406 Print 0144-8420
Status:Published
Keywords:70th ground level event, Neutron Monitor network, galactic cosmic rays
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:01 Dec 2009 14:13
Last Modified:20 Mar 2013 19:42

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