摘要
NUADU (中立原子察觉者单位) 在 TC-2 上的仪器记录了在 thenear 地球血浆表盘旋在磁场线附近的控告的粒子(E】180 keV ) 的 4nsolid 角度图象(在 ~-7 R_E，赤道的 dawn-to-night 方面) 在地磁气的暴风雨(Dst=-219 nT ) 期间在 2005 年 8 月 24 日。对称的、似环的、稳固的角度分布在周围的磁场线附近描绘的精力充沛的离子横梁事件被 theTC-2 太空船在血浆表的 34-minutetraversal 期间观察。另外，观察被磁强计实验(FGM ) 在一样的太空船上在血浆表的这些多重十字路口期间监视。在每个十字路口期间，口哨声模式合唱团改进被 TC-2 低频率电磁波察觉者(LFEW/TC-2 ) 就在本地更低的混血儿的上面在频率在各向异性的区域观察波浪。离子的比较与这块地里的改进排列了的周围的磁场表演搭角度分发(垫) 地图精力充沛的离子流动被尾巴病房在血浆表拉长磁场线伴随。相反，垂直离子流动改进被在血浆表显示磁场线的相应收缩的签名伴随。因为平行离子流动和垂直离子流动改进间歇地发生了，数据被解释暗示磁场线的一个动态、摆动的过程(拉长并且缩小)在thenear地球血浆表，它可能行动了帮助在将支持在进行中的磁性的暴风雨期间被触发的连续 aurora-substorm 的这个区域建立一个相互作用区域。Thewhistler 模式合唱团可能在血浆表压缩以后在粒子沥青角度散开期间由于离子旋转罗盘回声被生产了。
The NUADU （NeUtral Atom Detector Unit） instrument aboard TC-2 recorded 4n solid angle images of charged particles （E 〉180 keV） spiraling around the magnetic field lines in the near-Earth plasma sheet （at - -7 RE, equatorial dawn-to-night side） during a geomagnetic storm （Dst =-219 nT） on August 24, 2005. Energetic ion beam events characterized by symmetrical, ring-like, solid angle distributions around ambient magnetic field lines were observed during a 34ominute traversal of the plasma sheet by the TC-2 spacecraft. Also, observations during these multiple crossings of the plasma sheet were monitored by the magnetometer experiment （FGM） aboard the same spacecraft. During each crossing, a whistler-mode chorus enhancement was observed in the anisotropic area by the TC-2 low frequency electromagnetic wave detector （LFEW/TC-2） at a frequency just above that of the local lower hybrid wave. A comparison of the ion pitch angle distribution （PAD） map with the ambient magnetic field shows that an enhancement in the field aligned energetic ion flux was accompanied by tailward stretching of the magnetic field lines in the plasma sheet. In contrast, the perpendicular ion-flux enhancement was accompanied by a signature indicating the corresponding shrinkage of the magnetic field lines in the plasma sheet. Since both parallel ion-flux and perpendicular ion-flux enhancements occurred intermittently, the data were interpreted to imply a dynamical, oscillatory process of the magnetic field line （stretching and shrinking） in the near-Earth plasma sheet, which might have acted to help establish an interaction region in this area which would support continuous auroraosubstorm triggering during the ongoing magnetic storm. The whistler-mode chorus may have been produced due to ion gyro-resonance during particle pitch angle diffusion after the plasma sheet compression.
基金
Supported by the National Natural Science Foundation of China (Grant Nos. 40674083 and 40390153)
National Key Laboratory Research Outlay Grant 40523006
the Slovak Research and Development Agency under Contract No. APVV-51-053805.
作者简介
Corresponding author （email： luli@cssar.ac.cn）
