The elementary current method for calculating ionospheric current systems from multisatellite and ground magnetometer data
The elementary current method for calculating ionospheric current systems from multisatellite and ground magnetometer data
复制标题
根据多卫星和地面磁力计数据计算电离层电流系统的基本电流方法
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
O. Amm
中科院分区：
文献类型：
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作者：
O. Amm
最近发射的第二组使命首次提供了从一组卫星即时获得空间分布的场向电流测量值的可能性。我们提出的“基本电流法”，结合这种测量映射到电离层的二维地面磁数据，计算实际（不等效）电离层电流，而不需要进一步的假设。如果可以利用相干散射雷达对电离层电场进行额外的二维测量，还可以推断电离层霍尔电导和彼得森电导。证明了该方法的适用性的通过集群II航天器的电离层磁层耦合研究（MIRACLE）网络的地面仪器在北方芬诺斯坎迪亚于2001年2月1日，使用初步的，但现实的轨道参数。我们在这一过程中模拟的电离层电动参数的地球物理情况是指一个真实的等离子体涡旋在MIRACLE视场上向东传播的事件，正如Kosch等人[2000]所研究的那样。将元电流法应用于模拟的地面磁强计和卫星观测数据的计算结果表明，该方法可以很好地重建电离层电流以及Hall电导和Pedersen电导。
The recently launched Cluster II mission provides for the first time the possibility to instantaneously obtain spatially distributed measurements of field-aligned currents from a fleet of satellites. We present the “elementary current method” that combines such measurements mapped to the ionosphere with two-dimensional ground magnetic data, to calculate actual (not equivalent) ionospheric currents, without the need of further assumptions. If additional two-dimensional measurements of the ionospheric electric field from coherent scatter radars are available, the ionospheric Hall and Pedersen conductances can also be inferred. The applicability of the method is demonstrated for a passage of the Cluster II spacecraft over the Multi-Instrument Array for Ionosphere-Magnetosphere Coupling Studies (MIRACLE) network of ground-based instruments in northern Fennoscandia on February 1, 2001, using preliminary but realistic orbit parameters. The geophysical situation of ionospheric electrodynamic parameters that we model during this passage refers to a real event of a plasma vortex propagating eastward over the MIRACLE field of view, as studied by Kosch et al. [2000]. The application of the elementary current method to the simulated ground magnetometer and satellite measurements calculated from this model shows that the modeled ionospheric currents, as well as the Hall and Pedersen conductances, can be reconstructed by the method to good accuracy.