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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 114,
A07216,
7 PP., 2009
doi:10.1029/2008JA013197
Dynamics and waves near multiple magnetic null points in reconnection diffusion region
Department of Space Physics, Wuhan University, Wuhan, China
Institute of Information and Engineering, Nanchang University, Nanchang, China
Department of Space Physics, Wuhan University, Wuhan, China
Department of Space Physics, Wuhan University, Wuhan, China
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Uppsala Division, Swedish Institute of Space Physics, Uppsala, Sweden
Centre d'Etude des Environnements Terrestre et Planétaires, L'Institut Pierre-Simon La Place, Velizy, France
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Division of Mathematics, University of Dundee, Dundee, UK
Centre d'Etude Spatiale des Rayonnements, CNRS, Toulouse, France
Space and Atmospheric Physics, Imperial College, London, UK
Mullard Space Sciences Laboratory, University College London, London, UK
Laboratoire de Physique et Chimie de l'Environnement, CNRS, Orleans, France
Max-Planck Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Department of Space Physics, Wuhan University, Wuhan, China
Department of Space Physics, Wuhan University, Wuhan, China
Department of Space Physics, Wuhan University, Wuhan, China
Max-Planck Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
Uppsala Division, Swedish Institute of Space Physics, Uppsala, Sweden
Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa, USA
Space Science Center, University of New Hampshire, Durham, New Hampshire, USA
Department of Space Physics, Wuhan University, Wuhan, China
Department of Space Physics, Wuhan University, Wuhan, China
Department of Space Physics, Wuhan University, Wuhan, China
Department of Space Physics, Wuhan University, Wuhan, China
Department of Space Physics, Wuhan University, Wuhan, China
Identifying the magnetic structure in the region where the magnetic field lines break and how reconnection happens is crucial to improving our understanding of three-dimensional reconnection. Here we show the in situ observation of magnetic null structures in the diffusion region, the dynamics, and the associated waves. Possible spiral null pair has been identified near the diffusion region. There is a close relation among the null points, the bipolar signature of the Z component of the magnetic field, and enhancement of the flux of energetic electrons up to 100 keV. Near the null structures, whistler-mode waves were identified by both the polarity and the power law of the spectrum of electric and magnetic fields. It is found that the angle between the fans of the nulls is quite close to the theoretically estimated maximum value of the group-velocity cone angle for the whistler wave regime of reconnection.
Received 14 March 2008; accepted 12 May 2009; published 16 July 2009.
Citation: (2009), Dynamics and waves near multiple magnetic null points in reconnection diffusion region, J. Geophys. Res., 114, A07216, doi:10.1029/2008JA013197.
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