Abstract
Solar-Terrestrial Physics is a subject in which theory has usually followed observation. The first reported observation of a pulsation (Stewart, 1861) occurred about eighty years before Alfvén showed that a type of electromagnetic wave could propagate through a conducting fluid. Stewart’s work did help to bring about the realisation that there must be a current carrying layer in the upper atmosphere. Other observations followed and it soon became clear that small amplitude oscillations of both the strength and direction of the Earth’s magnetic field with periods of seconds to minutes, were common. They are now known as geomagnetic pulsations. They are the ground signature of hydromagnetic waves in the magnetosphere.
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© 1983 D. Reidel Publishing Company
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Hughes, W.J. (1983). Hydromagnetic Waves in the Magnetosphere. In: Carovillano, R.L., Forbes, J.M. (eds) Solar-Terrestrial Physics. Astrophysics and Space Science Library, vol 104. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7194-3_18
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DOI: https://doi.org/10.1007/978-94-009-7194-3_18
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