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托福新闻阅读:极光

发布时间:2013-04-26 16:58:13 来源:宁波朗阁培训中心 编辑:宁波朗阁小编
  为了方便广大考生复习和迎考,宁波新托福为大家搜集整理了托福新闻阅读:极光,供大家参考使用,希望会对大家有所帮助。  极光不仅是...
  为了方便广大考生复习和迎考,宁波新托福为大家搜集整理了托福新闻阅读:极光,供大家参考使用,希望会对大家有所帮助。
  极光不仅是个光学现象,而且是无线电现象,可以用雷达进行探测研究,它还会辐射出某些无线电波。有人还说,极光能发出各种各样的声音。极光不仅是科学研究的重要课题,它还直接影响到无线电通讯、长电缆通讯,以及长的管道和电力传送线等许多实用工程项目。极光还可以影响到气候,影响生物学过程。当然,极光也还有许许多多没有解开的谜。
  In the Arctic Circle, it is often possible to see a pageant of "Northern Lights (aurora borealis); seen a similar scene in the Antarctic Circle, known as the" southern lights (aurora australis). But not common in densely populated areas. This is caused by speculation and explore the mystery of the Sky centuries, the ancient Chinese, the Japanese, the Greeks, the Romans have a text description. The former Eskimos thought it was the spirits guide the torch of the souls of the dead to heaven, many ethnic groups have their different aurora legend. For a long time, the causes of the aurora has not been possible to get a satisfactory explanation. Quite a long time, it was believed that the aurora may be formed by the following three reasons. According to one view, The Aurora fire ignited outside the Earth, because the Arctic area near the edge of the earth, they are able to see this great fire. Another view was that, Aurora went down Yuhi transmission albedo glow. There is also a perception that the polar ice-rich, they absorb sunlight during the day, storage up to the night released, became Aurora. In short, opinions, inconclusive. Until the 1960s, the ground observations and satellite rocket detected combine research, before gradually formed a the aurora physical description.
  It is now recognized, Aurora on the one hand and to the large-scale interaction of the Earth's upper atmosphere and the Earth's magnetic field, on the other hand, with the sun erupted high-speed stream of charged particles, such particles flow is usually known as the solar wind (solar wind). Thus, the conditions essential for the formation of Aurora atmosphere, magnetic field and solar wind, are indispensable. With these three conditions of the other planets of the solar system, such as Jupiter, Saturn and Mercury around will produce the aurora, which has been proved by the fact of the experimental observations.
  长期观测统计结果显示,极光最经常出现的地方是南北地磁纬度67度附近的两个环带状区域内,分别称为南极光区和北极光区。在极光区内,差不多每天都会发生极光活动。在极光区所包围的内部区域,通常称为极盖区,在该区域内,极光出现的机会反而比纬度较低的极光区来得少。
扩展阅读:新托福阅读背景知识:磁场      托福阅读词汇总结:S
  以上就是宁波新托福培训为大家搜集整理的托福新闻阅读:极光,大家可以参考一下。如果想了解更多相关内容,欢迎您继续关注我们。最后,朗阁预祝烤鸭们考试顺利,加油!
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