Abstract：
:Magnetic reconnection is the process by which magnetic field lines of opposite polarity reconfigure to a lower-energy state, with the release of magnetic energy to the surroundings. Reconnection at the Earth's dayside magnetopause and in the magnetotail allows the solar wind into the magnetosphere. It begins in a small 'diffusion region', where a kink in the newly reconnected lines produces jets of plasma away from the region. Although plasma jets from reconnection have previously been reported, the physical processes that underlie jet formation have remained poorly understood because of the scarcity of in situ observations of the minuscule diffusion region. Theoretically, both resistive and collisionless processes can initiate reconnection, but which process dominates in the magnetosphere is still debated. Here we report the serendipitous encounter of the Wind spacecraft with an active reconnection diffusion region, in which are detected key processes predicted by models of collisionless reconnection. The data therefore demonstrate that collisionless reconnection occurs in the magnetotail.
journal_name
Naturejournal_title
Natureauthors
Oieroset M,Phan TD,Fujimoto M,Lin RP,Lepping RPdoi
10.1038/35086520keywords:
subject
Has Abstractpub_date
2001-07-26 00:00:00pages
414-7issue
6845eissn
0028-0836issn
1476-4687pii
35086520journal_volume
412pub_type
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