Global nature of field‐aligned currents and their relation to auroral phenomena
Global nature of field‐aligned currents and their relation to auroral phenomena
复制标题
场对准电流的整体性质及其与极光现象的关系
DOI：
10.1029/rg020i003p00709
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发表时间：
1982
影响因子：
25.2
通讯作者：
R. Carovillano
中科院分区：
文献类型：
--
作者：
N. A. Saflekos;R. Sheehan;R. Carovillano
搭载科学磁力仪的低空和高空航天器探测了地球磁层的磁场。这些测量表明，可能由发电机作用提供动力的场向电流流经地球附近的大片区域。本文的目的是报告美国在理解场向电流的全球性质及其与极光和电离层现象的关系方面对IMS努力的贡献。现在已经确定，场向电流在连接遥远地区和低电离层高度的相同场线上流动。同样，洋流在L壳体上流动，持续了当地时间几个小时。然而，越来越明显的是，不同纬度和经度的洋流来源并不相同。为此，我们分别讨论以下洋流区域：(1)正午部分，(2)黎明和黄昏部分，(3)午夜部分，和(4)极冠。特别注意极冠电离层的不规则性以及极光公里辐射与场向电流和极光光学发射的关系。
Low- and high-altitude spacecraft carrying scientific magnetometers have probed the magnetic fields of the terrestrial magnetosphere. These measurements reveal that field-aligned currents, possibly powered by dynamo action, flow over large regions of the earth's neighborhood. The purpose of this paper is to report on highlights of the U.S. contributions to the IMS effort in the area of understanding the global nature of the field-aligned currents and their relation to auroral and ionospheric phenomena. It has been established now that field-aligned currents flow on the same field lines connecting distant regions to low ionospheric altitudes. Similarly, currents flow on L shells extending over several hours of local time. However, it is becoming increasingly apparent that the sources of the currents in the various latitudes and longitudes are not the same. For this reason we discuss separately the following current-laden regions: (1) the noon sector, (2) the dawn and dusk sectors, (3) the midnight sector, and (4) the polar cap. Special attention is paid to polar cap ionospheric irregularities and the relation of auroral kilometric radiation to field-aligned currents and optical auroral emissions.