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Waves galore

机译:波涛汹涌

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摘要

The Suns outer atmosphere, the corona, is known to have a temperature in excess of 1 million kelvin - hotter than the visible surface by a factor of more than 200. The corona also expands into interplanetary space as a high-speed flow, the solar wind, which is supersonic, reaching speeds of several hundred kilometres per second near Earth. The existence of the corona and wind requires in situ deposition of energy, with the likely source being the coronal magnetic field. It has long been conjectured that a class of magnetic waves called Alfven waves can contain the required energy, but direct detection has proved challenging. On page 477 of this issue, Mclntosh et al.' identify Alfven waves in the corona in such profusion that their role needs urgent reassessment.
机译:已知太阳的外部大气电晕的温度超过100万开尔文-比可见表面高200倍以上。电晕还通过高速流动扩展到行星际空间,即太阳超音速的风速在地球附近达到每秒数百公里的速度。日冕和风的存在需要原位沉积能量,可能的来源是日冕磁场。长期以来,人们一直猜测一类称为Alfven波的电磁波可以包含所需的能量,但是直接检测已证明具有挑战性。在此问题的第477页上,Mclntosh等人。在电晕中识别出Alfven波时,需要紧急重新评估其作用。

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  • 来源
    《Nature》 |2011年第7357期|p.463-464|共2页
  • 作者单位

    Blackett Laboratory, Imperial College, London SW72BZ, UKSchool of Mathematics & Statistics, University ofSt Andrews, Fife KYI 6 9SS, UK;

    Blackett Laboratory, Imperial College, London SW72BZ, UKSchool of Mathematics & Statistics, University ofSt Andrews, Fife KYI 6 9SS, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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