Helicities in Geophysics, Astrophysics, and Beyond

Presents cutting-edge studies of helicities from different research fields

Helicities play essential roles in numerous geophysical, astrophysical, and magnetohydrodynamic phenomena, thus are studied from various disciplinary viewpoints.

Helicities in Geophysics, Astrophysics, and Beyond draws together experts from different research fields to present an interdisciplinary and integrated approach to helicity studies. This synthesis advances understanding of the fundamental physical processes underlying various helicity-related phenomena.

Volume highlights include:

• Concise introduction to fundamental properties of helicities
• Recent developments and achievements in helicity studies
• Perspectives from different fields including geophysics, space physics, solar physics, plasma physics, atmospheric and nonlinear sciences
• A cohesive mathematical, physical, observational, experimental, and numerical strategy for helicity studies

• A synthesized framework for the application of helicity to real-world problems

  The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.

  Autorentext

  Kirill Kuzanyan, IZMIRAN/Russian Academy of Sciences, Russia.

  Nobumitsu Yokoi, University of Tokyo, Japan.

  Manolis K. Georgoulis, Academy of Athens, Greece.

  Rodion Stepanov, Perm Federal Research Center, Russia.

  Klappentext
  Helicities in Geophysics, Astrophysics, and Beyond Helicities play essential roles in numerous geophysical, astrophysical, and magnetohydrodynamic phenomena, thus are studied from various disciplinary viewpoints. Helicities in Geophysics, Astrophysics, and Beyond draws together experts from different research fields to present an interdisciplinary and integrated approach to helicity studies. This synthesis advances understanding of the fundamental physical processes underlying various helicity-related phenomena. Volume highlights include: Concise introduction to fundamental properties of helicities Recent developments and achievements in helicity studies Perspectives from different fields including geophysics, space physics, solar physics, plasma physics, atmospheric and nonlinear sciences A cohesive mathematical, physical, observational, experimental, and numerical strategy for helicity studies * A synthesized framework for the application of helicity to real-world problems The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.

  Zusammenfassung
  Presents cutting-edge studies of helicities from different research fields Helicities play essential roles in numerous geophysical, astrophysical, and magnetohydrodynamic phenomena, thus are studied from various disciplinary viewpoints. Helicities in Geophysics, Astrophysics, and Beyond draws together experts from different research fields to present an interdisciplinary and integrated approach to helicity studies. This synthesis advances understanding of the fundamental physical processes underlying various helicity-related phenomena. Volume highlights include: Concise introduction to fundamental properties of helicities Recent developments and achievements in helicity studies Perspectives from different fields including geophysics, space physics, solar physics, plasma physics, atmospheric and nonlinear sciences A cohesive mathematical, physical, observational, experimental, and numerical strategy for helicity studies * A synthesized framework for the application of helicity to real-world problems The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.

  Inhalt

  List of contributors vii

  Preface ix

  Part I Helicity Essentials: Basic and Fundamental Concepts 1

  1 Introduction to Field Line Helicity 3
  Anthony R. Yeates and Mitchell A. Berger

  2 Magnetic Winding: Theory and Applications 17
  David MacTaggart

  3 Transport in Helical Fluid Turbulence 25 Nobumitsu Yokoi

  Part II Helicity Manifestations in Nature and Their Observations 51

  4 Observations of Magnetic Helicity Proxies in the Solar Photosphere: Helicity With Solar Cycles 53
  Hongqi Zhang, Shangbin Yang, Haiqing Xu, Xiao Yang, Jie Chen, and Jihong Liu

  5 Chirality of Solar Filaments and the Supporting Magnetic Field 75
  Peng-Fei Chen

  6 Solar Flares and Magnetic Helicity 83
  Shin Toriumi and Sung-Hong Park

  7 Magnetic Helicity Measurements in the Solar Wind 105
  Yasuhito Narita

  8 Magnetic Helicity in Rotating Neutron Stars 117
  Maxim Dvornikov

  9 Writhing From Biophysics to Solar Physics and Back 133
  Christopher Prior and Arron N. Bale

  10 Kinetic Helicity in the Earth's Atmosphere 149 Otto Chkhetiani and Michael Kurgansky

  Part III Theoretical and Numerical Helicity Modeling 167

  11 Effects of P-Noninvariance, Particles, and Dynamos 169
  Victor B. Semikoz and Dmitry D. Sokoloff

  12 Stability of Plasmas Through Magnetic Helicity 179
  Simon Candelaresi and Fabio Del Sordo

  13 Helicity-Conserving Relaxation in Unstable and Merging Twisted Magnetic Flux Ropes 189
  Philippa K. Browning, Mykola Gordovskyy, and Alan W. Hood

  14 Emergence of Magnetic Structure in Supersonic Isothermal Magnetohydrodynamic Turbulence 203
  Jean-Mathieu Teissier and Wolf-Christian Müller

  15 Nonlinear Mean-Field Dynamos With Magnetic Helicity Transport and Solar Activity: Sunspot Number and Tilt 217
  Nathan Kleeorin, Kirill Kuzanyan, Igor Rogachevskii, and Nikolai Safiullin

  16 The Spatial Segregation of Kinetic Helicity in Geodynamo Simulations 241 Avishek Ranjan and Peter Davidson

  Index 259