2007/05/31 by C. J. Xiao, Chijie Xiao, Xiaogang Wang +23 · 96 citations
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Astronomy #Astrophysical plasma #Computational physics #Field line #Geomagnetism and Paleomagnetism Studies #Ionosphere and magnetosphere dynamics #Magnetic field #Magnetic reconnection #Null (SQL) #Oscillation (cell signaling) #Physics #Plasma #Quantum mechanics #Solar and Space Plasma Dynamics #Spacecraft #physics.plasm-ph #physics.space-ph
paper · pdf · doi:10.1038/nphys650
published in Nature Physics 3(9), 609-613 (Nature Portfolio) · 10 pages, 3 figures and 1 table
openalex publication_date 2007/06/24 · arxiv created 2007/07/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Detection of a separator line that connects magnetic nulls and the determination of the dynamics and plasma environment of such a structure can improve our understanding of the three-dimensional (3D) magnetic reconnection process. However, this type of field and particle configuration has not been directly observed in space plasmas. Here we report the identification of a pair of nulls, the null-null line that connects them, and associated fans and spines in the magnetotail of Earth using data from the four Cluster spacecraft. With di and de designating the ion and electron inertial lengths, respectively, the separation between the nulls is found to be ~0.7di and an associated oscillation is identified as a lower hybrid wave with wavelength ~ de. This in situ evidence of the full 3D reconnection geometry and associated dynamics provides an important step toward to establishing an observational framework of 3D reconnection.