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Damping and Coupling of Long-Period Hydromagnetic Waves by the Ionosphere

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ULF Pulsations in the Magnetosphere

Part of the book series: Advances in Earth and Planetary Sciences ((AEPS,volume 11))

Abstract

The theory that long-period geomagnetic pulsations are due to hydromagnetic waves resonating in a magnetosphere bounded by an anisotropically conducting ionosphere, insulating atmosphere, and conducting earth, is reviewed. The history of the subject is outlined, covering the effects of the ionospheric boundary on: pulsations seen at ground level and in the ionosphere (ionospheric screening, 90° rotation of polarisation, attenuation of short wavelengths, mode coupling via Hall conductance); and wave systems above the ionosphere (wave-boundary impedance matching, damping, phase variation along the geomagnetic field, and allowed resonances). Coupling of non- axisymmetric modes within the magnetosphere is also mentioned, and a summary of the present picture given, with suggestions for future work.

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Authors and Affiliations

  1. Physics and Engineering Laboratory, Private Bag, Lower Hutt, New Zealand

    F. B. Knox & W. Allan

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  1. F. B. Knox
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  2. W. Allan
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D. J. Southwood

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© 1981 Center for Academic Publications Japan

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Knox, F.B., Allan, W. (1981). Damping and Coupling of Long-Period Hydromagnetic Waves by the Ionosphere. In: Southwood, D.J. (eds) ULF Pulsations in the Magnetosphere. Advances in Earth and Planetary Sciences, vol 11. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-8426-4_8

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  • DOI: https://doi.org/10.1007/978-94-009-8426-4_8

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-009-8428-8

  • Online ISBN: 978-94-009-8426-4

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