It is thought that Electrophonic sounds may be induced in events of bolide, very bright auroraldisplay, nearby strong lightning, earthquake and nuclear explosion.
据报道，大的流星火球、非常明亮的北极光、附近的强闪电、地震以及核爆炸等，都可能产生电声响。
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But freak solar activity yesterday saw the stunning auroraldisplay stretch much further than usual, as it was spotted by stunned stargazers across half of northern America.