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Glossary term: 太阳风

Description: 太阳风是一股粒子流,主要由质子和电子组成,以每秒高达 900 公里的速度从太阳向外流动。太阳风本质上是温度较高的日冕向行星际空间膨胀。

许多恒星都有这样的恒星风;像太阳这样温度较低、磁场活跃的恒星,太阳是由其磁场产生的热日冕驱动的。对于一些温度较高的恒星,恒星风来源于它们的巨大光度,它们通过辐射压将粒子从上层大气中挤出。较冷的红巨星和超巨星也可以通过辐射压力驱动产生“风”。从恒星吹出的风的一般术语描述是恒星风。

太阳风或恒星风的粒子轰击会对行星上可能存在的生命造成危害。地球磁场可以保护地球表面的生命免受太阳风的破坏。太阳风和地球磁场之间的相互作用是地球两极附近出现极光的原因。

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