作业帮北极光 英文介绍本质上来说,极光是原子与分子在地球大气层最上层(距离地面100-200公里处的高空)运作激发的光学现象.它的形成有三大要素：太阳、风、地球磁场、大气.所谓“太阳风”,是
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北极光 英文介绍本质上来说,极光是原子与分子在地球大气层最上层(距离地面100-200公里处的高空)运作激发的光学现象.它的形成有三大要素：太阳、风、地球磁场、大气.所谓“太阳风”,是
北极光 英文介绍
本质上来说,极光是原子与分子在地球大气层最上层(距离地面100-200公里处的高空)运作激发的光学现象.它的形成有三大要素：太阳、风、地球磁场、大气.所谓“太阳风”,是太阳对宇宙不断放射的一种能量,它是由电子与质子所组成.由于太阳的激烈活动,放射出无数的带电微粒,当带电微粒流射向地球进入地球磁场的作用范围时,受地球磁场的影响,便沿着地球磁力线高速进入到南北磁极附近的高层大气中,与氧原子、氮分子等质点碰撞,因而产生了“电磁风暴”和“可见光”的现象,就成了众所瞩目的“极光”.
北极光 英文介绍本质上来说,极光是原子与分子在地球大气层最上层(距离地面100-200公里处的高空)运作激发的光学现象.它的形成有三大要素：太阳、风、地球磁场、大气.所谓“太阳风”,是
不是上面的翻译.
是介绍 北极光（Aurora Borealis）的英文短文：
极光：
Auroras (North/South Polar Lights) are natural colored light displays in the sky,usually observed at night,particularly in the polar zone.They typically occur in the ionosphere.Some scientists[who?] call them "polar auroras".In northern latitudes,the effect is known as the aurora borealis,named after the Roman goddess of dawn,Aurora,and the Greek name for north wind,Boreas.It often appears as a greenish glow or sometimes a faint red,as if the sun was rising from an unusual direction.The aurora borealis is also called the northern polar lights,as it is only visible in the North sky from the Northern Hemisphere.The aurora borealis most often occurs from September to October and from March to April.The Cree call this phenomenon the Dance of the Spirits.
Its southern counterpart,the aurora australis/southern polar lights,has similar properties.Australis is the Latin word for "of the South".
Benjamin Franklin first brought attention to the "mystery of the Northern Lights." He theorized the shifting lights to a concentration of electrical charges in the polar regions intensified by the snow and other moisture.