Cassini observations of aperiodic waves on Saturn's magnetodisc

Cassini observations of aperiodic waves on Saturn's magnetodisc
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卡西尼号对土星磁盘上非周期波的观测

DOI:
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
C. Arridge
C. Arridge
中科院分区:
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文献类型:
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作者:
C. J. Martin;C. Arridge

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土星赤道电流片的位置和运动是在径向距离和当地时间变化的准静态形变、产生大规模位移的脉冲扰动、行星自转周期附近的准周期扰动以及较短时间尺度上的波状结构相互作用的结果。这项研究的重点是后者,即周期从1分钟到30分钟的非周期波脉冲,它与周期接近土星自转的准周期“拍打”无关。卡西尼磁力仪的数据被调查了这些非周期结构,然后将其拟合到一个简单的模型中,以便估计波的性质。该模型由修正的Harris电流片模型组成,该模型由高斯脉冲波函数变形而成。然后,这允许提取波参数和电流片属性。特别地,我们发现电流片尺度高度随距土星的径向距离而增大,波幅随径向距离的增大而增大,并利用模型拟合的波矢量来分辨传播方向。主要的传播方向被发现是从土星径向向外的。
The location and motion of Saturn's equatorial current sheet is the result of an interplay between a quasi‐static deformation that varies in radial distance and local time, impulsive perturbations that produce large‐scale displacements, quasiperiodic perturbations near the planetary rotation period, and wave‐like structures on shorter timescales. This study focuses on the latter, aperiodic wave pulses with periods from 1 to 30 min, which are unrelated to the quasiperiodic “flapping” with a period near that of Saturn's rotation. Cassini magnetometer data were surveyed for these aperiodic structures and then fitted to a simple model in order to estimate the properties of the waves. The model consists of a modified Harris current sheet model deformed by a Gaussian pulse wave function. This then allows for the extraction of wave parameters and current sheet properties. In particular, we show an increase in current sheet scale height with radial distance from Saturn, an increase in the wave amplitude with radial distance, and the resolution of propagation directions using the wave vector fitted by the model. The dominant propagation direction is found to be radially outward from Saturn.
DOI: 10.1029/2007ja012963
发表时间: 2008-08
影响因子: --
作者:
C. Arridge;K. Khurana;C. Russell;D. Southwood;N. Achilleos;M. Dougherty;A. Coates;H. Leinweber
通讯作者: C. Arridge;K. Khurana;C. Russell;D. Southwood;N. Achilleos;M. Dougherty;A. Coates;H. Leinweber
DOI: 10.1029/2007ja012540
发表时间: 2008-04
期刊: Scopus
影响因子: --
作者:
C. Arridge;C. Russell;N. Achilleos;K. Khurana;M. Dougherty;S. Cowley;E. Bunce;D. Southwood
通讯作者: C. Arridge;C. Russell;N. Achilleos;K. Khurana;M. Dougherty;S. Cowley;E. Bunce;D. Southwood
磁盘中本地时间不对称的来源
DOI: 10.1007/s11214-015-0145-z
发表时间: 2015
影响因子: 10.3
作者:
Arridge C
通讯作者: Arridge C
DOI: 10.1029/2010ja015666
发表时间: 2010
期刊: Space Physics
影响因子: --
作者:
Andrews D
通讯作者: Andrews D