期刊
GEOPHYSICAL RESEARCH LETTERS
卷 46, 期 19, 页码 10710-10718出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GL083909
关键词
Uranus; plasmoid; magnetic reconnection; magnetosphere; plasma transport; Ice Giant
A magnetosphere controls a planet's evolution by suppressing or enhancing atmospheric loss to space. In situ measurements of Uranus' magnetosphere from the Voyager 2 flyby in 1986 provide the only direct evidence of magnetospheric transport processes responsible for this atmospheric escape at Uranus. Analysis of high-resolution Voyager 2 magnetic field data in Uranus' magnetotail reveals the presence of a loop-like plasmoid filled with planetary plasma traveling away from the planet. This first plasmoid observation in an Ice Giant magnetosphere elucidates that (1) both internal and external forces play a role in Uranus' magnetospheric dynamics, (2) magnetic reconnection contributes to the circulation of plasma and magnetic flux at Uranus, and (3) plasmoids may be a dominant transport mechanism for mass loss through Uranus' magnetotail.
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