_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
_/
_/ 流体力学セミナー ２００６ No. ９
_/
_/ 日 時 : ０６年 １０月 ６ 日 (金) １０：３０〜１２：００
_/
_/ 場 所 : 京大数理研 ２０２号室
_/
_/ 講 師： Abraham C.-L. Chian
_/ National Institute for Space Research (INPE) and
_/ World Institute for Space Environment Research (WISER),
_/ Brazil
_/
_/ 題 目： Title: Chaos and Intermittency in the Sun-Earth Complex System
_/
_/ 内 容 :
_/ Sun-Earth system is a complex, electrodynamically coupled system
_/ dominated by nonlinear interactions. The complex behaviors of the
_/ solar-terrestrial environment, e.g., the phenomena of solar flares and
_/ geomagnetic storms, 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 solar-terrestrial environment is the
_/ occurrence of intermittency and chaos in the solar dynamo, solar
_/ corona, solar wind, and terrestrial
_/ magnetosphere-ionosphere-atmosphere. The characterization of the
_/ chaotic and intermittent nature of the sun-Earth system is essential
_/ for efficient monitoring and forecasting of space weather and space
_/ climate, as well as global climate change. In this talk, we show that
_/ the dynamical systems approach is capable of elucidating the origin of
_/ the intermittent dynamics in the solar-terrestrial environment. Two
_/ partial differential equations are considered: the
_/ Kuramoto-Sivashinsky equation and the regularized long-wave equation,
_/ which govern the nonlinear evolution of Alfven waves and drift waves
_/ in plasmas, respectively. We demonstrate that a chaotic attractor in
_/ space plasmas and fluids is composed of chaotic saddles and unstable
_/ periodic orbits, and explain the links between theses unstable
_/ structures and spatiotemporal intermittency.
_/
_/ Chian, A.C.-L. et al., JGR 111, A07S03, 2006.
_/ Rempel, E.L. and Chian, A.C.-L., PRE 71, 016203, 2005.
_/ He, K. and Chian A.C-L., PRE 69,026207, 2004.
_/ He, K. and Chian, A.C.-L., PRL 91, 034102, 2003.
_/ Chian, A.C.-L. et al., PRE 65, 035203(R), 2002.
_/
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/

世話人：山田 道夫(京大数研)、藤 定義(京大理)、松本 剛(京大理)、
アドバイザー：藤坂博一（京大情報学）、船越 満明（京大情報学）、
水島 二郎(同志社大工)、余田 成男（京大理）
連絡先：yamada@kurims.kyoto-u.ac.jp
メールリスト連絡先： semi-adm@kyoryu.scphys.kyoto-u.ac.jp

戻る [http://www.kyoryu.scphys.kyoto-u.ac.jp/semi/semi2.html]