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Electromagnetic Coupling in the Polar Clefts and Caps pp 167–186Cite as

ULF Pulsations in the Polar Cusp and Cap

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Part of the book series: NATO ASI Series ((ASIC,volume 278))

Abstract

ULF waves are a means for the elctromagnetic coupling and communication between different plasma regimes. With respect to this, ULF pulsation research in recent years has concentrated much on polar cusp and cap regions as it is here where the Earth’s magnetic field configuration allows direct access of magnetosheath plasma and waves into the magnetosphere proper. Satellite observations in the cusp region exhibit the existence of strong fluctuations of the magnetic field as well as plasma density and flow, probably generated by e.g. drift wave or Kelvin-Helmholtz instabilities in the nonuniform cusp plasma regimes. At the ground a variety of different ULF pulsations are found — regular pulsation trains, irregular activity, transient perturbations etc. A strong dependence of this pulsation activity on upstream solar wind conditions is found, where the correlation with the IMF cone angle and the IMF B z component prevails. The often observed spiky or transient magnetic field variations at cusp latitudes suggest a clear correlation with flux transfer events at the dayside magnetosphere or dynamic pressure changes of the magnetosheath flow.

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Authors and Affiliations

  1. Institut für Geophysik und Meteorologie, Universität zu Köln, Albertus-Magnus-Platz, D-5, Köln 41, Federal Republic of Germany

    Karl-Heinz Glassmeier

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  1. Karl-Heinz Glassmeier
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Editors and Affiliations

  1. Department of Physics, University of Oslo, Box 1048, Blindern, 0316, Oslo 3, Norway

    P. E. Sandholt

  2. Department of Physics, University of Oslo, Oslo, Norway

    A. Egeland

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© 1989 Kluwer Academic Publishers

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Glassmeier, KH. (1989). ULF Pulsations in the Polar Cusp and Cap. In: Sandholt, P.E., Egeland, A. (eds) Electromagnetic Coupling in the Polar Clefts and Caps. NATO ASI Series, vol 278. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0979-3_12

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  • DOI: https://doi.org/10.1007/978-94-009-0979-3_12

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-6929-8

  • Online ISBN: 978-94-009-0979-3

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