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PHYSICS OF MAGNETOSPHERIC POLAR CAP BY ANALYSIS OF FIELD-ALIGNED CURRENTS.

通过磁场对准电流分析来了解磁层极盖的物理学。

基本信息

批准号：
61540305
负责人：
IIJIMA Takesi
金额：
$ 1.22万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1988
项目状态：
已结题

项目摘要

I have obtained new knowledge on magnetospheric physics, by analyzing the geomagnetic field data that was acquired with various artificial satellites, which includes the following:1. Large-scale field-aligned current systems associated with northward interplanetary magnetic field (NBZ current system).The NBZ field-aligned currents are thought to flow so as to transfer the sunward plasma stress down to the polar cap ionosphere so that large-scale sunward plasma convection is maintained in the central polar-cap plasma domain. The acquisition of this sunward plasma stress from the interplanetary medium is thought to take place in the magnetospheric high-latitude boundary layer often called the plasma mantle.2. Large-scale Region 1 and Region 2 field-aligned current systems.The region 1 current system is thought to originated in the magnetospheric voltage generator, whereas the region 2 current system is ascribable to the combination of the voltage generator and current generator.3. Large-scale magnetospheric equatorial currents.The electric current flowing parallel to and near the geomagnetic equatorial plane is comprised of an azimuthal current flowing westward and a radial current flowing toward the earth in the evening sector and away from the earth in the morning sector. These horizontal currents exhibit a net positive divergence (source) in the evening sector and a net negative divergence (sink) in the morning sector. The location, flow direction and the intensities of these divergent currents are almost identical with those of the region 2 field-aligned current system. The westward ring current and the region 2 current system are closely connected.4. Substorm-associated field-aligned currents.The three-dimensional current system throughout the course of substorm is not solely ascribable to a diversion of magnetospheric cross-tail current but a development of radial current is essental.

通过分析各种人造卫星获得的地磁场数据，我获得了关于磁层物理的新知识，其中包括：1.与向北的行星际磁场相关的大尺度场向电流系统(NBZ电流系统)。NBZ场向电流被认为是流动的，从而将向阳的等离子体应力向下传递到极帽电离层，从而在中央极帽等离子体区域保持大范围的向阳等离子体对流。从行星际介质获得这种朝向太阳的等离子体应力被认为发生在磁层高纬度边界层，通常被称为等离子体地幔。区域1和区域2的大规模场向电流系统。区域1电流系统被认为起源于磁层电压发生器，而区域2电流系统被归因于电压发生器和电流发生器的组合。大尺度磁层赤道流。平行于地磁赤道面并在地磁赤道面附近流动的电流由向西流动的方位向电流和在夜间流向地球、在早晨远离地球的径向电流组成。这些水平流在夜间部分表现为净正散度(源)，在早晨部分表现为净负散度(汇)。这些发散流的位置、流向和强度与区域2场向电流系统的位置、流向和强度基本一致。西向环流与二区电流系紧密相连。亚暴相关的场向电流。整个亚暴过程中的三维电流系统并不完全归因于磁层交叉尾流的转移，而径向电流的发展是必不可少的。