Japan Geoscience Union Meeting 2014

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International Session (Oral)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM08_1PM2] Space Weather and Space Climate

Thu. May 1, 2014 4:15 PM - 6:00 PM 411 (4F)

Convener:*Ryuho Kataoka(National Institute of Polar Research), Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Kanya Kusano(Solar-Terrestrial Environment Laboratory, Nagoya University), Toshifumi Shimizu(Institute of Space and Astronautical Science, JAXA), Yoshizumi Miyoshi(Solar-Terrestrial Environement Laboratory, Nagoya University), Ayumi Asai(Unit for Synergetic Studies of Space, Kyoto University), Tatsuhiko Sato(Japan Atomic Energy Agency), Hidekatsu Jin(National Institude of Information and Communications Technology), Kiminori Itoh(Graduate School of Engineering, Yokohama National University), Hiroko Miyahara(College of Art and Design, Musashino Art University), Chair:Ryuho Kataoka(National Institute of Polar Research), Tatsuhiko Sato(Japan Atomic Energy Agency)

5:00 PM - 5:15 PM

[PEM08-04] Estimation of Astronaut Dose inside the Kibo Module during Large Solar Flare Events

*Tatsuhiko SATO1, Ryuho KATAOKA2, Aiko NAGAMATSU3 (1.Japan Atomic Energy Agency, 2.National Institute of Polar Research, 3.Japan Aerospace Exploration Agency)

Keywords:solar flare, radiation dose, solar energetic particle, astronaut, space weather, PHITS

Forecast of radiation doses for astronauts as well as aircrews due to the exposure to solar energetic particles (SEP) is one of the greatest challenges in space weather research. In last 3 years, we have developed a warning system of aviation exposure to solar energetic particles: WASAVIES, which can predict the SEP doses at any flight conditions within 2.5 hours after the onset of ground level enhancements (GLE). In this system, the SEP fluxes incident to the atmosphere are calculated by physics-based models [1,2], and they are converted to radiation doses using a database developed on the basis of air-shower simulation [3]. In this study, we applied the same physics-based models to the estimate of the SEP fluxes on the orbit of International Space Station, and converted the fluxes to radiation doses for astronauts staying inside the Kibo module. For this conversion, we performed Monte Carlo cosmic-ray transport simulation, using the Particle and Heavy Ion Transport code System PHITS [4] in combination with the realistic 3D model of the Kibo module. A brief outline of WASAVIES together with the results of the astronaut dose estimation will be presented at the meeting.[1] Y. Kubo, submitted to Space Weather[2] R. Kataoka et al. submitted to Space Weather[3] T. Sato et al. (2013) Radiat. Prot. Dosim. doi:10.1093/rpd/nct332[4] T. Sato et al. (2013) J. Nucl. Sci. Technol. 50, 913-923. http://phits.jaea.go.jp/