Orientation, location, and velocity of Saturn's bow shock: Initial results from the Cassini spacecraft

Orientation, location, and velocity of Saturn's bow shock: Initial results from the Cassini spacecraft
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土星弓激波的方向、位置和速度:卡西尼号航天器的初步结果

DOI:
10.1029/2005ja011297
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发表时间:
2006
期刊:
Space Physics
影响因子:
--
通讯作者:
Achilleos N
Achilleos N
中科院分区:
--
文献类型:
--
作者:
Achilleos N

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卡西尼号宇宙飞船于 2004 年 7 月 1 日(格林威治标准时间)开始土星之旅。在插入轨道期间,卡西尼磁力计(MAG)、无线电/等离子体波实验(RPWS)和等离子体光谱仪(CAPS)获得了与土星环境相关的磁场和等离子体条件的原位测量。磁场数据分析表明,卡西尼号在入境(黎明后)和出境(黎明前)航段上反复穿过主要准垂直的弓形激波边界。弓激波和磁层顶交叉位置的建模显示了卡西尼号沉浸在磁层期间磁层压缩的证据。弓激波交叉点的磁特征显示了与准垂直几何形状相关的明确定义的“过冲”和“足部”区域。激波脚的持续时间,结合弓形激波交叉点上游的 RPWS 和 CAPS 太阳风电子参数来考虑,表明土星弓形激波斜坡的长度尺度约为离子惯性长度。这与多航天器对地球激波脚区域空间尺度的观测结果是一致的。这些数据与土星弓激波速度高达~400 km s−1 和由离子动力学控制的激波结构基本一致。
The Cassini spacecraft commenced its tour of the planet Saturn on 1 July 2004 (GMT). During the insertion orbit, the Cassini magnetometer (MAG), radio/plasma wave experiment (RPWS), and plasma spectrometer (CAPS) obtained in situ measurements of the magnetic field and plasma conditions associated with Saturn's environment. Analysis of the magnetic field data indicate that Cassini repeatedly crossed a mainly quasi‐perpendicular bow shock boundary on both the inbound (post‐dawn) and outbound (predawn) legs. Modeling of the bow shock and magnetopause crossing positions shows evidence for a magnetospheric compression during Cassini's immersion in the magnetosphere. The magnetic signatures of the bow shock crossings show the clearly defined “overshoot” and “foot” regions associated with the quasi‐perpendicular geometry. The duration of the shock foot, considered in combination with the RPWS and CAPS solar wind electron parameters upstream of the bow shock crossings, indicates that the length scale for the bow shock ramp at Saturn is about an ion inertial length. This is consistent with multispacecraft observations of the spatial scale of the Earth's shock foot region. The data are generally consistent with Saturn bow shock velocities up to ∼400 km s−1and shock structures governed by ion dynamics.
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