第67回「非線形・統計力学とその周辺」セミナーのご案内

日時：平成１７年９月１３日（火）午後１時半〜午後２時半

場所：京都大学工学部総合校舎１０２室

講演者： Prof. Abraham C.-L. Chian (Solar-Terrestrial Environment Laboratory (STEL), Nagoya Univ. & National Institute for Space Research (INPE), Brazil)

講演題目： On the Complex Nature of Space Environment

講演要旨：

Sun-Earth system is a complex, electrodynamically coupled, system
dominated by nonlinear interactions. The complex behaviors of space
environment are an indication that it is in a state far from
equilibrium whereby instabilities, nonlinear waves and turbulence
play key roles in the system dynamics. One of the ubiquitous
features of the complex space environment is the occurrence of
intermittency and chaos in solar dynamo, solar corona, solar wind,
and terrestrial magnetosphere-ionosphere-atmosphere. First we will
discuss the observational evidence of intermittency and chaos in
the solar-terrestrial environment. Next we will discuss a chaotic
model of interplanetary Alfven intermittency and its relevance
for the understanding of solar-wind driving of intense geomagnetic
activities. We show that the origin of temporal intermittency and
spatiotemporal intermittency is the unstable structures, namely,
chaotic saddles and unstable periodic orbits, embedded in the
chaotic attractors. The characteristics intermittency time obeys
a scaling law which can be useful for space weather forecasting
and economic forecasting. We will complete this talk by reviewing
the ongoing research and training activities of the international
network WISER - World Institute for Space Environment Research
(http://www.cea.inpe.br/wiser), which focuses on the application
of complex systems science for monitoring and forecasting natural
disasters in the Earth-Oceans-Space (EOS) systems.

Chian ACL et al., Phys. Rev. E 65, 035203 (R), 2002.
Rempel EL, Chian ALC, Phys. Lett. A 319, 104, 2003.
Rempel EL et al., Physica D 199, 407, 2004.
Rempel EL, Chian ACL, Int. J. Bifurcation & Chaos 14, 4009, 2004.
Rempel EL et al., Chaos 14, 545, 2004.
Rempel EL, Chian ACL, Phys. Rev. E 71, 016203, 2005.