英语语法分析

It was demonstrated from the observations that most plasmoids in the magnetotail are the flux rope structures with a large core field.

观测表明，多数磁尾等离子体团为具有强核心场的通量绳结构。

The results show clearly that the charged particles of the magnetotail under the action of the dawn-dusk electric field undergo evident scattering process.

计算结果清楚地显示出了磁尾粒子在晨昏电场的作用下，经历着明显的散射过程。

In this paper, the pitch Angle changing of charged particles of the magnetotail under the action of the dawn-dusk electric field is studied by evaluating about 900 trajectories by computer.

本文从粒子的轨道理论人手，通过对近900条粒子轨道的具体计算，研究了磁尾粒子在晨昏电场作用下的投掷角变化。