Japan Geoscience Union Meeting 2015

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International Session (Oral)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG07] Continental-Oceanic Mutual Interaction: Global-scale Material Circulation through River Runoff

Wed. May 27, 2015 9:00 AM - 10:45 AM 201B (2F)

Convener:*Yosuke Yamashiki(Global Water Resources Assessment Laboratory - Yamashiki Laboratory Graduate School of Advanced Integrated Studies in Human Survivability Kyoto University), Yukio Masumoto(Japan Agency for Marine-Earth Science and Technology), Swadhin Behera(Climate Variation Predictability and Applicability Research Program Research Institute for Global Change/JAMSTEC, 3173-25 Showa-machi, Yokohama 236-0001), Yasumasa Miyazawa(Japan Agency for Marine-Earth Science and Technology), Toshio Yamagata(Japan Agency for Marine-Earth Science and Technology), Kaoru Takara(Disaster Prevention Research Institute, Kyoto University), Chair:Yukio Masumoto(Japan Agency for Marine-Earth Science and Technology), Swadhin Behera(Climate Variation Predictability and Applicability Research Program), Toshio Yamagata(Japan Agency for Marine-Earth Science and Technology)

9:00 AM - 9:30 AM

★ [ACG07-01] Variability of the Sun

*Hiroaki ISOBE1 (1.Unit of Synergetic Studies for Space, Kyoto University)

The Sun is a variable star. In addition to the evolution of its internal structure and the rotational velocity as a main sequence star, its magnetic activity changes with time scales from seconds to millennia. Accordingly, the solar influence on the terrestrial environment also changes. The temporal variation of the solar magnetic activity results in the variation of the electromagnetic radiation, the solar wind and the energetic particles. The variation of the energetic particles consists of the variation of the solar energetic particles, which positively correlates with the solar magnetic activity, and the variation of the galactic cosmic rays, which negatively correlates with the solar magnetic activity. In this presentation I will summarize the current understandings of the mechanisms and the terrestrial consequences of the solar variability in various time scales. Then I will introduce selected recent topics, such as the UV/EUV radiation of the abnormally quiet minima in the last solar cycle, and the investigation of the past solar activities recorded in the historical documents.