Announcement of “Helicity Thinkshop 3”

19-23 November 2017, Tokyo, Japan

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.
γ€€γ€€γ€€γ€€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

  1. to share frontier knowledge on the topic of helicity stemming from observational investigations in astrophysics and geophysics, and from numerical simulations and experiments in fluids and plasmas;
  2. to promote closer collaboration between different research fields involved in helicity studies (e.g., solar/stellar/geo, theory/modeling/experimental/observations);
  3. to construct models of phenomena potentially influenced by helicity whose underlying physical mechanisms are not entirely understood.
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.

Host Institutes of the Helicity Thinkshop 3:
Institute of Industrial Science (IIS), University of Tokyo
Isntitute for Space-Earth Environmental Research (ISEE), Nagoya University

Sponsors of the Helicity Thinkshop 3:
IIS, University of Tokyo
Institute for Space-Earth Environmental Research (ISEE), Nagoya University
The Kajima Foundation
Japan Society for the Promotion of Science (JSPS, for participants from Japan)
Russia Foundation for Basic Research (RFBR, for participants from Russia)

Scientific Organizing Committee:
Axel Brandenburg (Sweden/USA), Manolis Georgoulis (Greece), Kirill Kuzanyan (Russia), Raffaele Marino (France), Alexei Pevtsov (USA/Finland), Takashi Sakurai (Japan), Dmitry Sokoloff (Russia), Nobumitsu Yokoi (Chair, Japan), Hongqi Zhang (China)

Local Organizing Committee:
Nobumitsu Yokoi (Chair, University of Tokyo), Shoji Koyama (University of Tokyo), Takashi Sakurai (NAOJ), Yoichiro Hanaoka (NAOJ), Masaoki Hagino (NAOJ), Shin Toriumi (NAOJ)

Venues of the Helicity Thinkshop 3:
Institute of Industrial Science (IIS), University of Tokyo
4-6-1, Komaba, Meguro, Tokyo 153-8505, Japan
National Astronomical Observatory of Japan (NAOJ)
2-21-1, Mitaka, Tokyo 181-8588, Japan

Preliminary Schedule:
Sunday, 19 Nov. Registration at IIS from Monday, 20 Nov. to Thursday, 23 Nov. Scientific Talks and Discussions including one session at NAOJ and tour to Solar Observatory

Registration fee is 10,000 yen (about 80 Euro or 90 USD) excluding the banquet.
Further information about the Thinkshop including registration, housing, etc. is given at a webpage (

If you have some questions, suggestions, and comments, please contact Nobumitsu Yokoi: nobyokoi (at) or Kirill Kuzanyan: kuzanyan (at)