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Relation to solar activity of intense aurorae in sunlight and darkness

机译:日光和黑暗中强烈极光与太阳活动的关系

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摘要

The oldest documented relationship between the number of sunspots (the solar cycle) and terrestrial effects is the increased frequency of aurorae in the period immediately after the solar maximum (the peak of the number of sunspots). This correlation is, however, based only on observations of the relatively rare events of 'great aurorae', which are those that reach mid-latitudes or lower. The overwhelming majority of intense aurorae, and therefore most of the energy put into the ionosphere, occurs at high latitudes, where aurorae appear nightly. Here we report the global frequency of aurorae as a function of solar cycle, determined by data from the US Air Force Defense Meteorological Satellite Program. We find that, contrary to expectations, the total number of intense aurorae is uncorrelated with solar activity in darkness, and is negatively correlated with solar activity in sunlit conditions. These findings imply a causal relationship between aurorae and ionospheric conductivity (the latter is maximal at solar maximum) and therefore indicate that the occurrence of intense aurorae is a discharge phenomenon, similar to lightning.
机译:太阳黑子数(太阳活动周期)与地面效应之间最古老的关系记录是在太阳最大后(太阳黑子数高峰)之后的极光频率增加。但是,这种相关性仅基于对“极光”相对罕见事件的观察,即达到中纬度或更低的事件。绝大多数强烈的极光以及因此进入电离层的大部分能量都发生在高纬度地区,极光在夜间出现。在这里,我们报告了极光的全球频率与太阳周期的关系,该频率是由美国空军国防气象卫星计划的数据确定的。我们发现,与预期相反,强烈极光的总数与黑暗中的太阳活动无关,而与阳光条件下的太阳活动负相关。这些发现暗示了极光与电离层电导率之间的因果关系(电离层电导率在太阳最大值时最大),因此表明强极光的出现是一种放电现象,类似于闪电。

著录项

  • 来源
    《Nature》 |1998年第6683期|p.342-344|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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