Abstract
The discontinuous structure of the solar wind is described with emphasis on properties related to geomagnetic impulses. Some of the discontinuities are clearly hydromagnetic shocks and tangential discontinuities, and can produce a significant change in the momentum flux at the magnetosphere boundary. Such a change generates an impulse which propagates through the magnetosphere to the Earth where it is observed world-wide as an impulse in magnetograms. The propagation process is not reviewed here, but the relation between the initial cause (discontinuity) and the final effect (geomagnetic impulse) is reviewed in detail. The various types of impulses are examined, and are related qualitatively to the various types of discontinuities. The magnitude of an impulse is related to the change in the momentum flux. The propagation time and the rise time depend on the propagation process rather than on the initial state. Double shocks have not been observed, but a reverse shock has been identified. Giant pairs can be caused by a shock followed by a tangential discontinuity, and regular pairs may be due to complementary tangential discontinuities.
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Burlaga, L.F. (1972). Discontinuities and Shock Waves in the Interplanetary Medium and Their Interaction with the Magnetosphere. In: Dyer, E.R. (eds) Solar-Terrestrial Physics/1970. Astrophysics and Space Science Library, vol 29. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3693-5_20
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