On the structures and mapping of auroral electrostatic potentials
On the structures and mapping of auroral electrostatic potentials
复制标题
极光静电势的结构和绘图
DOI：
10.1029/ja086ia12p10029
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发表时间：
1981
影响因子：
--
通讯作者：
J. Cornwall
中科院分区：
文献类型：
--
作者：
Y. Chiu;A. Newman;J. Cornwall
在Chiu和Cornwell(1980)为极光提出的磁层-电离层电动力耦合动力学模型中，我们研究了磁层和电离层电场的映射。一个新的特征是将动能电流电势关系推广到返回电流区(确定为从磁层到电离层的平行电位降为正的区域)；除非电离层带电到严重的非物理值，否则始终存在这种返回电流。我们首次能够给出倒置V的低能返回电流和高能沉淀的相干现象学图像。磁层和电离层电场之间的映射是根据充当过滤器的格林函数来描述的，强调磁层纬度空间尺度的顺序(当映射到电离层时)50-150公里。我们将这一长度大致确定为倒V区的整体大小。粗略地说，这个标尺长度乘以电离层上方的垂直电场，就得出了电离层和赤道磁层之间平行电势降的大小。给出了这些量之间的精确关系：第一次：在论文的正文中；以前的二维动力学模型将平行的势降作为假设输入。
We examine the mapping of magnetospheric and ionospheric electric fields in a kinetic model of magnetospheric-ionospheric electrodynamic coupling proposed for the aurora by Chiu and Cornwell (1980). A new feature is the generalization of the kinetic current potential relationship to the return current region (identified as a region where the parallel potential drop from magnetosphere to ionosphere is positive); such a return current always exists unless the ionosphere is electrically charged to grossly unphysical values. We are able for the first time to give a coherent phenomenological picture of both the low-energy return current and the high-energy precipitation of an inverted V. The mapping between magnetospheric and ionospheric electric fields is phrased in terms of a Green's function that acts as a filter, emphasizing magnetospheric latitudinal spatial scales of order (when mapped to the ionosphere) 50-150 km. We identify this length as roughly the overall size of the inverted V region. Roughly speaking, this scale length, when multiplied by the perpendicular electric field just above the ionosphere, gives the magnitude of the parallel potential drop between the ionosphere and equatorial magnetosphere. A precise relation between these quantities is given: for the first time: in the body of the paper; previousmore » two-dimensional kinetic models have taken the parallel potential drop as an assumed input.« less