Abstract
We argue that the pi2 is a transient hydromagnetic signal associated with changes in magnetospheric state. We review both theory and what is known experimentally about signal structure. After comparing observations with theory we suggest that the mid-latitude pi2 is due to a surface wave traveling along the plasmapause. At high latitudes the situation is more complex. We look at some of the effects that should be important in the auroral zone pi2 and also discuss the Alfven wave structures that can form in high speed flows. We conclude by reviewing the diagnostic capabilities of the pi2 signal.
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Southwood, D.J., Stuart, W.F. (1979). Pulsations at the Substorm Onset. In: Akasofu, SI. (eds) Dynamics of the Magnetosphere. Astrophysics and Space Science Library, vol 78. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9519-2_17
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DOI: https://doi.org/10.1007/978-94-009-9519-2_17
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