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Long-term trends in geomagnetic daily variation

机译:地磁日变化的长期趋势

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Long-term changes in the magnetic environment of the Earth are of interest to those studying space weather and climate change, particularly in the upper atmosphere. In this paper we examine long-term changes in daily variation as derived from hourly mean values from 14 geomagnetic observatories around the world. Their time series date back to the beginning of the 20th century. We find that there are similar features in all the records, with peaks in the amplitudes of the daily variation occurring in the 1950s and 1980s, and a small upward trend of 1.3 nT/century corresponding to an increase of over 10%. The extrema coincide with those seen in solar irradiance proxy data, in particular the F10.7 flux density dataset which starts in 1947.
机译:研究太空天气和气候变化,特别是高层大气的人们感兴趣的是地球磁环境的长期变化。在本文中,我们研究了每日变化的长期变化,这些变化是由全球14个地磁观测站的小时平均值得出的。他们的时间序列可以追溯到20世纪初。我们发现所有记录都具有相似的特征,其每日变化幅度的峰值出现在1950年代和1980年代,而1.3 nT /世纪的上升趋势很小,相当于增加了10%以上。极值与在太阳辐照度代理数据中看到的极值一致,特别是始于1947年的F10.7通量密度数据集。

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