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A doubling of the Sun's coronal magnetic field during the past 100 years

机译:在过去100年中,太阳的日冕磁场增加了一倍

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摘要

The solar wind is an extended ionized gas of very high electrical conductivity, and therefore drags some magnetic flux out of the Sun to fill the heliosphere with a weak interplanetary magnetic field. Magnetic reconnection—the merging of oppositely directed magnetic fields—between the interplanetary field and the Earth's magnetic field allows energy from the solar wind to enter the near-Earth environment. The Sun's properties, such as its luminosity, are related to its magnetic field, although the connections are still not well understood. Moreover, changes in the heliospheric magnetic field have been linked with changes in total cloud cover over the Earth, which may influence global climate. Here we show that measurements of the near-Earth interplanetary magnetic field reveal that the total magnetic flux leaving the Sun has risen by a factor of 1.4 since 1964: surrogate measurements of the interplanetary magnetic field indicate that the increase since 1901 has been by a factor of 2.3. This increase may be related to chaotic changes in the dynamo that generates the solar magnetic field. We do not yet know quantitatively how such changes will influence the global environment.
机译:太阳风是具有很高电导率的扩展电离气体,因此会将一些磁通量从太阳中拖出,以用弱的行星际磁场填充日光层。行星际磁场与地球磁场之间的磁场重新连接(方向相反的磁场合并)使来自太阳风的能量进入近地环境。太阳的性质(例如,光度)与磁场有关,尽管这种关系还没有得到很好的理解。此外,日球磁场的变化与地球上总云量的变化有关,这可能会影响全球气候。在这里,我们显示出对近地行星际磁场的测量表明,自1964年以来,离开太阳的总磁通量增加了1.4倍:对行星际磁场的替代测量表明,自1901年以来的增加已增加了1倍。 2.3。这种增加可能与产生太阳磁场的发电机的混沌变化有关。我们尚不定量地知道这种变化将如何影响全球环境。

著录项

  • 来源
    《Nature》 |1999年第6735期|p.437-439|共3页
  • 作者单位
  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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