Hybrid simulation of Titan's interaction with the supersonic solar wind during Cassini's T96 flyby

Hybrid simulation of Titan's interaction with the supersonic solar wind during Cassini's T96 flyby
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卡西尼号 T96 飞越期间土卫六与超音速太阳风相互作用的混合模拟

DOI:
10.1002/2015gl066848
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发表时间:
--
影响因子:
5.2
通讯作者:
W.S. Kurth
W.S. Kurth
中科院分区:
地球科学1区
文献类型:
--
作者:
M. Feyerabend;S. Simon;F.M. Neubauer;U. Motschmann;C. Bertucci;N.J.T. Edberg;G.B. Hospodarsky;W.S. Kurth

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通过应用混合(动能离子和流体电子)模拟程序,我们研究了2013年12月1日卡西尼号T96飞越期间土星最大的卫星土卫六的等离子体环境。T96的遭遇标志着整个卡西尼号任务中唯一观察到的事件,土卫六位于土星弓激波前面的超音速太阳风中。我们的模拟可以定量地再现这次相遇期间卡西尼号磁场和电子密度观测的关键特征。我们证明了T96年期间土卫六感应磁层的大尺度特征可以用与高压太阳风流的稳态相互作用来描述。在相遇前约40分钟,卡西尼号观测到入射太阳风磁场旋转了近90°。我们提供了强有力的证据,表明这种自转在土卫六的电离层中留下了一束化石磁力线,随后被航天器探测到。
By applying a hybrid (kinetic ions and fluid electrons) simulation code, we study the plasma environment of Saturn's largest moon Titan during Cassini's T96 flyby on 1 December 2013. The T96 encounter marks the only observed event of the entire Cassini mission where Titan was located in the supersonic solar wind in front of Saturn's bow shock. Our simulations can quantitatively reproduce the key features of Cassini magnetic field and electron density observations during this encounter. We demonstrate that the large‐scale features of Titan's induced magnetosphere during T96 can be described in terms of a steady state interaction with a high‐pressure solar wind flow. About 40 min before the encounter, Cassini observed a rotation of the incident solar wind magnetic field by almost 90°. We provide strong evidence that this rotation left a bundle of fossilized magnetic field lines in Titan's ionosphere that was subsequently detected by the spacecraft.
来自磁场和电子等离子体观测和建模的土卫六近磁尾:卡西尼号飞越 TA、TB 和 T3
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