Geomagnetic tides and related phenomena

  • Nils Olsen
Atmospheric Tides And Related Phenomena
Part of the Lecture Notes in Earth Sciences book series (LNEARTH, volume 66)


Daily variations of the geomagnetic field with amplitudes of about 50 nT at middle latitudes have been known for almost three centuries. Electrical currents in the conducting upper atmosphere are responsible for their main part. They are caused by tidal winds, which are excited by solar heating of the atmosphere as well as by gravitational forces of the moon. In addition, smaller contributions to magnetic variations arise from electrical currents in the magnetosphere, and from tidal currents in the oceans.


Solar Activity Interplanetary Magnetic Field Daily Variation Main Field International Reference Ionosphere 
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© Springer-Verlag 1997

Authors and Affiliations

  • Nils Olsen
    • 1
  1. 1.Geophysics, Univ. CopenhagenDK-CopenhagenDenmark

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