SSS 2012-07-11
时间：2019-01-08 作者：英语课 分类：Scientific American(七)月
英语课
Interesting sound. I would have guessed a Wild West performer was practicing with a bullwhip while also vacuuming. But no. That sound [SOUND] is apparently 1 produced by the aurora 2 borealis, the northern lights. [SOUND]
Since 2000 researchers at Finland’s Aalto University have been collecting audio as part of what’s called the Auroral 3 Acoustics 4 project. Folk tales have long held that the lights also produce odd sounds, but the claims were hard to prove. And some researchers thought that any noises produced by the energetic particles that cause the light show would be far too high in the sky to be heard on the ground.
But the latest results indicate that at least some sounds are produced very close to the ground. A setup of three ground-based microphones allowed researchers to estimate that the sounds occur perhaps just 70 meters up. The results were just presented at the International Congress on Sound and Vibration 5 in Vilnius, Lithuania.
More information about the sounds of the northern lights could lead to a more complete understanding of the phenomenon. So if you see an aurora, keep your ears open.
Thanks for the minute for Scientific Americans 60 second Science, I am Steve Mirsky
adv.显然地；表面上，似乎
- An apparently blind alley leads suddenly into an open space.山穷水尽，豁然开朗。
- He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
n.极光
- The aurora is one of nature's most awesome spectacles.极光是自然界最可畏的奇观之一。
- Over the polar regions we should see aurora.在极地高空,我们会看到极光。
adj.曙光的；玫瑰色的
- This high result was interpreted to reflect previous aurora activity.这一高结果可以用以前的极光活动来解释。
- The aurora is one of nature's most awesome spectacles.极光是自然界最可畏的奇观之一。
n.声学，(复)音响效果，音响装置
- The acoustics of the new concert hall are excellent.这座新音乐厅的音响效果极好。
- The auditorium has comfortable seating and modern acoustics.礼堂里有舒适的座椅和现代化的音响设备。