首页>
外文OA文献
>The role of O-type neutral lines in magnetic merging during substorms and solar flares
【2h】
The role of O-type neutral lines in magnetic merging during substorms and solar flares
展开▼
机译:O型中性线在亚暴和太阳耀斑过程中在磁合并中的作用
展开▼
免费
页面导航
摘要
著录项
相似文献
相关主题
摘要
An analytical model of O-type configurations was derived, for visualizing the geometry and for numerical treatment of plasma flows. It was found that at a certain distance from the neutral line the mean particle motion became decoupled from that of magnetic field lines (which obey the MHD condition). The decoupling distance depended on initial conditions in momentum space, suggesting that the MHD approximation which averages out such conditions may not suffice for describing plasma dynamics near the neutral line. It was also found that after inflowing particles are decoupled from the field line motion, they go over to a mode of runaway acceleration along the neutral line. It is concluded that if merging occurs at an X-O pair, two particle populations may be expected - low energy particles accelerated adiabatically by earthward convection past the X-type line and high-energy particles convected towards the O-type line. The second acceleration process depends critically on the rapidity of merging and is therefore expected to vary considerably from event to event.
展开▼