It is thought that Electrophonic sounds may be induced in events of bolide, very bright auroral display, 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。
But freak solar activity yesterday saw the stunning auroral display stretch much further than usual, as it was spotted by stunned stargazers across half of northern America.
但是昨天反常的太阳活动造福了北美人民：超级绚丽的北极光此次的延伸范围广得多，使得半个美国的天文爱好者大饱眼福，亲眼见证了北极光。
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