SH009-0014
Separation of Magnetic Field Lines in Transverse 3D Turbulence Using the Random Ballistic Decorrelation

Tuesday, 8 December 2020
Poster
Chutima Yannawa1, Peera Pongkitiwanichakul1, David J Ruffolo2, Wirin Sonsrettee3, Piyanate Chuychai4 and Andrew P Snodin5, (1)Kasetsart University, Department of Physics, Faculty of Science, Bangkok, Thailand, (2)Mahidol University, Department of Physics, Faculty of Science, Bangkok, Thailand, (3)Faculty of Engineering and Technology, Panyapiwat Institute of Management, Nonthaburi, Thailand, (4)33/5 Moo 16, Tambon Bandu, Muang District, Chiang Rai, Thailand, (5)Newcastle University, School of Mathematics, Statistics and Physics, Tyne and Wear, United Kingdom
Abstract:
The interplanetary magnetic field is turbulent, and its field lines follow a random walk that becomes diffusive beyond a correlation scale. The field line random walk (FLRW) strongly influences the transport of energetic charged particles. While the FLRW determines how far a field line can wander, the separation of magnetic field lines determines how a bundle of field lines spread out into space, along with a distribution of energetic charged particles, such as solar energetic particles. In this work, we study the separation of two magnetic field lines subject to transverse turbulent magnetic fluctuations. We assume Corrsin's hypothesis and random ballistic decorrelation and derive the diffusion coefficient for the separation of two field lines for different types of turbulence. We verify our analytic results with computer simulations. Partially supported by grant RTA6280002 from Thailand Science Research and Innovation.
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