Song Yan, Lysak Robert L
School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA.
Phys Rev Lett. 2006 Apr 14;96(14):145002. doi: 10.1103/PhysRevLett.96.145002. Epub 2006 Apr 11.
We show for the first time the dynamical relationship between the generation of magnetic field-aligned electric field (E||) and the temporal changes and spatial gradients of magnetic and velocity shears, and the plasma density in Earth's magnetosphere. We predict that the signatures of reconnection and auroral particle acceleration should have a correlation with low plasma density, and a localized voltage drop (V||) should often be associated with a localized magnetic stress concentration. Previous interpretations of the E|| generation are mostly based on the generalized Ohm's law, causing serious confusion in understanding the nature of reconnection and auroral acceleration.
我们首次展示了地球磁层中磁场平行电场（E||）的产生与磁切变、速度切变以及等离子体密度的时间变化和空间梯度之间的动态关系。我们预测，重联和极光粒子加速的特征应与低等离子体密度相关，并且局部电压降（V||）通常应与局部磁应力集中相关。以往对E||产生的解释大多基于广义欧姆定律，这在理解重联和极光加速的本质方面造成了严重混乱。
