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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 5
Ann. Geophys., 14, 538–544, 1996
https://doi.org/10.1007/s00585-996-0538-0
© European Geosciences Union 1996
Ann. Geophys., 14, 538–544, 1996
https://doi.org/10.1007/s00585-996-0538-0
© European Geosciences Union 1996

  31 May 1996

31 May 1996

Magnetospheric contributions to geomagnetic daily variations

N. Olsen N. Olsen

Abstract. The contribution of magnetospheric current systems to geomagnetic daily variations is analyzed by means of a spherical harmonic analysis (SHA) using elementary models as well as the Tsyganenko model of the magnetosphere. It is discovered that the magnetospheric contribution to some SHA coefficients is much higher than the known average value of about 20%, especially when considering non-local time terms and solstitial conditions.

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