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Long-term trends in geomagnetic daily variation

Earth, Planets and Space volume 59, pages 391–395 (2007)Cite this article

Abstract

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.

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Author notes

  1. Susan Macmillan

    Present address: Shell E&P Int., Kesslerpark 1, 2880 AB, Rijswijk, Netherlands

Authors and Affiliations

  1. British Geological Survey, West Mains Road, Edinburgh, EH9 1LS, UK

    Susan Macmillan & Anna Droujinina

Authors
  1. Susan Macmillan
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  2. Anna Droujinina
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Correspondence to Susan Macmillan.

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Macmillan, S., Droujinina, A. Long-term trends in geomagnetic daily variation. Earth Planet Sp 59, 391–395 (2007). https://doi.org/10.1186/BF03352699

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  • DOI: https://doi.org/10.1186/BF03352699

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