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Studies of Geomagnetic Conjugacy at Very High Latitudes

  • Chapter
Polar Cap Boundary Phenomena

Part of the book series: NATO ASI Series ((ASIC,volume 509))

Abstract

Studies of geomagnetic variations in conjugate regions have played an important role in understanding the Earth’s space environment, especially since these measurements can often be used to distinguish between space and time variations on global scales. Largely because of logistics difficulties, conjugate studies at very high latitudes, including the magnetospheric cusp and polar cap regions, have not been extensively pursued over the years. This paper summarizes some current research on the nature of magnetic conjugacy at cusp and polar cap latitudes. We show that the daily Sq variations at conjugate cusp latitudes are appreciable, and that the ionosphere over South Pole station appears to have a larger ionization in austral summer than does the ionosphere over its conjugate region (Iqaluit, Canada) in the northern summer. We also show that the largest coherence between conjugate cusp areas (South Pole and Iqaluit) occurs in the period band ~ 200 to ~ 600 seconds. Using this coherence as an indicator during local morning and local afternoon hours in quiet geomagnetic conditions, the boundary between open and closed geomagnetic field lines can be deduced to lie between the South Pole/Igaluit latitudes (~ 74° geomagnetic) and polar cap conjugate stations at ~ 80° geomagnetic.

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Author information

Authors and Affiliations

  1. Bell Laboratories, Lucent Technologies, Murray Hill, NJ, 07974, USA

    C. G. Maclennan, L. J. Lanzerotti & D. J. Thomson

Authors
  1. C. G. Maclennan
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  2. L. J. Lanzerotti
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  3. D. J. Thomson
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Editor information

Editors and Affiliations

  1. University Courses on Svalbard, Longyearbyen, Norway

    J. Moen

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

    A. Egeland

  3. Rutherford Appleton Laboratory, Chilton, Oxfordshire, UK

    M. Lockwood

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© 1998 Springer Science+Business Media Dordrecht

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Maclennan, C.G., Lanzerotti, L.J., Thomson, D.J. (1998). Studies of Geomagnetic Conjugacy at Very High Latitudes. In: Moen, J., Egeland, A., Lockwood, M. (eds) Polar Cap Boundary Phenomena. NATO ASI Series, vol 509. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5214-3_25

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  • DOI: https://doi.org/10.1007/978-94-011-5214-3_25

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-6195-7

  • Online ISBN: 978-94-011-5214-3

  • eBook Packages: Springer Book Archive

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