论文标题
上F区域中血浆压力梯度的磁效应
Magnetic Effects of Plasma Pressure Gradients in the Upper F Region
论文作者
论文摘要
通常假定，在极纬度处的高度飞行，仅认为与局部磁场对齐的电流。因此，沿着主要场方向的干扰主要是极光电流电流的特征，由于与电流的距离，其结构相对光滑。在这里，我们表明，在这种平滑信号上叠加是小扰动的不规则模式，与Langmuir探针测量的等离子体密度相关。我们表明，通过假设它们代表J x B力，可以很好地再现扰动，从而平衡了密度变化所隐含的等离子压力梯度。在赤道附近，以前据报道最重要的相关磁电流似乎是极地纬度的无处不在现象。光谱分析表明，这种作用主导着磁场强度的变化，在几十公里的小尺寸上。
The Swarm satellites fly at altitudes that at polar latitudes are generally assumed to onlycontain currents that are aligned with the local magnetic field. Therefore, disturbances along the main field direction are mainly signatures of auroral electrojet currents, with a relatively smooth structure due to the distance from the currents. Here we show that superimposed on this smooth signal is an irregular pattern of small perturbations, which are anticorrelated with the plasma density measured by the Langmuir probe. We show that the perturbations can be remarkably well reproduced by assuming they represent a j x B force, which balances the plasma pressure gradient implied by the density variations. The associated diamagnetic current, previously reported to be most important near the equator, appears to be a ubiquitous phenomenon also at polar latitudes. A spectral analysis indicates that this effect dominates magnetic field intensity variations at small-scale sizes of a few tens of kilometers.
