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Author |
N. Fuller, K. L. Klein, J. F. Bottollier-Depois, P. Yaya, Y. Kubo, T. Sato |
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Title |
Neutron monitors and the evaluation of radiation doses for civil aviation |
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Communication |
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2019 |
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AGU Fall Meeting Abstracts |
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31 |
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7924 Forecasting 7934 Impacts on technological systems 7944 Ionospheric effects on radio waves SPACE WEATHER |
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Abstract |
Cosmic rays at energies that are able to trigger particle cascades in the Earth's atmosphere are the main source of radiation at aircraft altitudes. In 2018 the International Civil Aviation Organisation (ICAO) identified consortia for a worldwide space weather service that will operate starting November 2019. In this contribution we describe how the Australia-Canada-France-Japan (ACFJ) consortium intends to provide the service monitoring radiation due to galactic cosmic rays and solar energetic particles. It will be shown that neutron monitor measurements from ground are an essential ingredient to assess radiation doses aboard aircraft due to solar energetic particles, while space-borne measurements at lower energies (up to a few hundreds of MeV) may provide valuable additional information. We then briefly describe two types of models used to detect a solar event and evaluate dose rates: a semi-empirical model called SIGLE-RT developed at Paris Observatory, which has been employed since many years in cooperation with Institut de Radioprotection et Sûreté Nucléaire (IRSN) for the a posteriori evaluation of radiation doses for French aviation, and a physics-based model called WASAVIES employing particle transport and air shower calculations developed by National Institute of Information and Communications Technology (NICT), Japan Atomic Energy Agency (JAEA), and others in Japan. The two models are being compared for opposite extremes of recent solar energetic particle events, namely the strong event on 2005 Jan 20 and the rather weak one on 2017 Sep 10. Results will be presented and discussed. |
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227 |
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yes |
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7745 |
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