Discontinuities in the magnetic field near Enceladus

Discontinuities in the magnetic field near Enceladus
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土卫二附近磁场的不连续性

DOI:
10.1002/2014gl060081
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发表时间:
2014
影响因子:
5.2
通讯作者:
M. K. Dougherty
M. K. Dougherty
中科院分区:
地球科学1区
文献类型:
--
作者:
J. Saur;S. C. Treeck;H. Kriegel;M. K. Dougherty

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土星冰冷的卫星土卫二的等离子体相互作用产生了一个半球耦合电流系统,直接连接了这颗巨大行星的北方和南极磁层。基于2004年至2014年期间所有20次有针对性的土卫二飞行的卡西尼磁力计观测,我们研究了与这些半球耦合电流相关的磁场不连续性。我们确定了总共11个事件,在此期间的磁场是不连续的表面土卫二通量管(定义的束磁场线切向固体的月球)。应用最小方差分析来计算这些不连续的表面法线。与理论预期一致,法线被发现垂直于土卫二通量管的表面。半球耦合电流随土卫二经度的变化也在观测到的磁场跳跃强度中留下了清晰的印记。
The plasma interaction of Saturn's icy moon Enceladus generates a hemisphere coupling current system that directly connects the giant planet's northern and southern polar magnetosphere. Based on Cassini magnetometer observations from all 20 targeted Enceladus flybys between 2004 and 2014, we study the magnetic field discontinuities associated with these hemisphere coupling currents. We identify a total number of 11 events during which the magnetic field was discontinuous at the surface of the Enceladus flux tube (defined by the bundle of magnetic field lines tangential to the solid body of the moon). A minimum variance analysis is applied to calculate the surface normals of these discontinuities. In agreement with theoretical expectations, the normals are found to be perpendicular to the surface of the Enceladus flux tube. The variation of the hemisphere coupling currents with Enceladean longitude leaves a clear imprint in the strengths of the observed magnetic field jumps as well.
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发表时间: 2011
影响因子: --
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