Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm44a..03x&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM44A-03
Astronomy and Astrophysics
Astrophysics
7526 Magnetic Reconnection (2723, 7835), 7835 Magnetic Reconnection (2723, 7526), 2723 Magnetic Reconnection (7526, 7835)
Scientific paper
Magnetic reconnection is one of the most important processes in astrophysical, space and laboratory plasmas for explaining fast dynamic release of magnetic energy. Though reconnection is three-dimensional (3D) in nature, the fundamental properties of 3D reconnection are not clearly understood. Based on the theoretical models and numerical simulations, magnetic nulls are regarded the elementary structure in 3D reconnection, on which magnetic field lines are breaking and reconnecting. Due to its three dimensional geometric property, the null can only be detected by an at least 4-point measurement which is so far uniquely provided by Cluster mission. We report here a fortuitous event that as a tetrahedron of Cluster four-spacecraft traversing a diffusion region in the Earth's magnetotail on 15 September, 2001, an isolated magnetic null is identified. It is the first report of such a null ever observed with the in-situ spacecraft measurements. The magnetic null can also be sorted as Bs-type by analyzing the spiral structure of the magnetic field in the null's neighborhood with high resolution data. Analysis of spacecraft in-situ measurements also shows that the spine structure of the null has a scale of the local ion inertial length di, suggesting that the Hall effect may be important in 3D reconnection dynamics.
Balogh André
Escoubet C.
Fazakerley Andrew
Fu Siqi
Galland Kivelson Margaret
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