Magnetospheric sash dependence on IMF direction
Magnetospheric sash dependence on IMF direction
复制标题
磁层带对 IMF 方向的依赖
DOI：
10.1029/2000gl003784
复制
发表时间：
2001
影响因子：
5.2
通讯作者：
W. White
中科院分区：
文献类型：
--
作者：
G. Siscoe;G. Erickson;B. U. Ö Sonnerup;N. Maynard;K. Siebert;D. Weimer;W. White
磁层带是一个马蹄形的弱场带，其开口端邻近南北向阳面，磁层顶尖点及其闭合端形成交叉尾电流片。当行星际磁场（IMF）的时钟角从0 °旋转到180°时，黎明-黄昏子午线平面（从太阳看去）中窗扇的时钟角从0 °旋转到90°。我们使用全局MHD模拟来获得45°、90°和135°的IMF时钟角的窗扇时钟角。值得注意的是，结果是非常接近的时钟角度的磁零点通过叠加一个均匀的磁场代表IMF上的偶极子场代表地球。垂直于太阳风流动方向的横截面上的磁场强度轮廓显示了窗扇是如何从向阳侧的尖点向尾部演变的。
The magnetospheric sash is a ribbon of weak field shaped like a horseshoe with its open ends adjacent to the north and south dayside, magnetopause cusps and its closed end forming the cross‐tail current sheet. The clock angle of the sash in the dawn‐dusk meridian plane (as seen from the sun) rotates from 0° to 90° as the clock angle of the interplanetary magnetic field (IMF) rotates from 0° to 180°. We use a global MHD simulation to obtain the sash clock angles for IMF clock angles of 45°, 90°, and 135°. Remarkably, the results are very close to the clock angle of the magnetic null points obtained by superposing a uniform field representing the IMF on a dipole field representing the earth. Contours of magnetic field strength on cross sections perpendicular to the solar wind flow direction show how the sash evolves tailward from the dayside cusps.