auroral forms

例句：

1. 1. The auroral forms were visible from the observation deck.
   从观景台上可以看到极光形态。
2. 2.This region is famous for its auroral displays during the winter months.
   这个地区在冬季因其极光展示而闻名。
3. 3.The auroral forms are caused by charged particles in the Earth's atmosphere.
   极光形态是由地球大气中的带电粒子造成的。