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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Longitudinal and local time asymmetries ofmagnetospheric turbulence in Saturn's plasma sheet
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Longitudinal and local time asymmetries ofmagnetospheric turbulence in Saturn's plasma sheet

机译：当地时间纵向和不对称在土星的等离子体ofmagnetospheric动荡表

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摘要

Based on earlier studies that have shown Saturn's middle magnetosphere to contain turbulent magnetic field fluctuations, we analyze the spatial and temporal variations of the magnetic fluctuations and turbulent heating rate as a function of local time and magnetic phase. The region of study is Saturn's plasma sheet at a distance of 6–20 R_s, where R_s is Saturn's equatorial radius. The data set consists of magnetic field data measured during 92 orbits (revolutions) from the equatorial phases of Cassini covering 9 years from 2004 to 2012. We find asymmetries in the magnetosphere with enhanced fluctuations around noon. With respect to longitude we find increased fluctuations at 65° southern and 250° northern magnetic phase. This leads to an increased turbulent heating rate in these regions and is consistent with regions of increased plasma density and maximum downward field-aligned currents according to the quasi-dipolar perturbation fields. Analysis of single orbits reveals that the heating rate of 79% of all analyzed inbound and outbound legs is significantly (statistical error less than 1%) sinusoidally modulated. The modulation of the turbulent heating rate is predominantly observed during times when Cassini is located between dusk and midnight and additionally at dawn.
机译：基于先前的研究已经表明土星中间磁气圈包含湍流磁场波动,我们分析空间和时间变化的磁场波动和动荡的升温速率当地时间的函数和磁阶段。区域的研究是土星的等离子体片距离6 20 R_s, R_s土星赤道半径。磁场测量数据在92年轨道(革命)的赤道阶段卡西尼号覆盖9年从2004年到2012年。发现不对称的磁气圈增强的中午左右波动。我们发现增加波动在经度65°和250°南部北部磁阶段。这将导致增加湍流加热率在这些地区和区域是一致的增加的等离子体密度和最大的下降根据field-aligned电流quasi-dipolar扰动字段。单一的轨道表明,升温速率79%的入站和出站的腿是分析明显(统计误差小于1%)呈现正弦调制。动荡的升温速率主要是观察在卡西尼号坐落在黄昏的时候和另外午夜到黎明。

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