指出关于铅球最佳投掷角计算公式中存在的问题，提出了计算这一角度的精确方程和数值解。

The problem of shots optimum putting angle in calculation formulae are pointed out, precise equation and numerical solution of this angle are given.

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因此，主相时所观测到的极光，并不是由于地磁场的平缓下降使小投掷角电子注入大气层而形成的。

This means that the excitation of aurora during the main phase can not be attributed to the precipitation of electrons into atmosphere caused by the slow change of geomagnetic field.

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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。

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.

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