The magneticfield associated with these particles helps protect the Earth from cosmic rays by deflecting them from the planet.
地磁场同这些粒子相结合令宇宙射线发生弯曲，从而帮助地球避开来访的宇宙射线。
2
A method of designing slowly-scanning circuits is described and a new type of deflection coil that can offer a uniform deflectingmagneticfield is proposed.
本文叙述了慢扫描电路的设计方法，提出了一种新型偏转线圈结构，它能获得均匀的偏转磁场。
3
The general theory and experiment-al method for measuring the TV deflectingmagneticfield are given in detail.