Institute of Industrial Science (IIS), University of Tokyo
Institute for Space-Earth Environmental Research (ISEE), Nagoya University
National Astronomical Observatory of Japan (NAOJ)
The Kajima Foundation
Helicities (kinetic, magnetic, current, cross, etc.), as well as energies, are fundamental quantities of hydrodynamics (HD) and magnetohydrodynamics (MHD). In the presence of certain combination of anisotropies (caused by, e.g., rotation, gravity, magnetic fields, etc.), mirror and reflectional symmetries in HD and MHD turbulence are broken. Symmetry-breaking in turbulence is measured by pseudoscalars such as helicities, which represent the topological properties of turbulence. In helical turbulence, mean-field structures (global vorticity, mean magnetic field, etc.) can be generated through a dynamo action by turbulent motions. Therefore, the dynamic and magnetic activities of the Sun and stars are intimately related to turbulent helicities. These relationships have been extensively investigated, both theoretically and observationally.
In the past, two Helicity Thinkshops, mainly on solar physics, were held in 2009 and 2013 at the National Astronomical Observatory of China (NAOC) at Beijing, China (Chair: Hongqi Zhang). They originated from a Chapman Conference on Magnetic Helicity in Space and Laboratory Plasmas held at Boulder, USA, in 1998 (Chair: Alexei Pevtsov). This time we organize a Helicity Thinkshop in Tokyo, Japan.
Aims and Topics:
The aims of this workshop (Helicity Thinkshop 3) are
Topics to be discussed include
In order to enhance interdisciplinary communication, all speakers in Helicity Thinkshop 3 are expected to present their talks in plain, generic physics language.
Nobumitsu Yokoi (Chair, University of Tokyo), Shoji Koyama (University of Tokyo), Takashi Sakurai (National Astronomical Observatory of Japan), Yoichiro Hanaoka (National Astronomical Observatory of Japan), Masaoki Hagino (National Astronomical Observatory of Japan), Shin Toriumi (National Astronomical Observatory of Japan)