HR: 0800h
AN: SH41A-1112    [Abstracts]
TI: Variation of solar activity and its effect on climate since the Spoerer Minimum
AU: * Miyahara, H
EM: miyahara@stelab.nagoya-u.ac.jp
AF: Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601 Japan
AU: Masuda, K
EM: kmasuda@stelab.nagoya-u.ac.jp
AF: Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601 Japan
AU: Muraki, Y
EM: muraki@stelab.nagoya-u.ac.jp
AF: Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601 Japan
AB: This paper presents the evolution of the eleven-year solar cycle since the Spoerer Minimum (1415-1534 AD) deduced from the cosmogenic isotope in tree rings. We have measured the carbon-14 content from 1410 to 1745 AD with annual time resolution, and investigated the modulation of the length of the eleven-year solar cycle associated with the occurrence of the prolonged sunspot minima such as the Spoerer and Maunder minima (1645-1715 AD). A phase transition is found in the waveform of C14 record after the Maunder Minimum. We investigate the global structure of the heliospheric magnetic field during the transition interval. Possible roles of cosmic ray variation in the climate change are also discussed.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 2104 Cosmic rays
DE: 2479 Solar radiation and cosmic ray effects
DE: 4918 Cosmogenic isotopes (1150)
DE: 7536 Solar activity cycle (2162)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005