Abstract
Magnetograms of ground-based geomagnetic variation are a useful, yet cumbersome data source for substorm studies. In this study geomagnetic variations from 52 northern hemisphere observatories are used to create magnetic potential contour plots representing so called “equivalent ionospheric current” systems. Contour plots of 10 isolated and storm-time substorms for 26 – 28 March 1976 demonstrate the dynamic behavior of the westward and eastward electrojets in the auroral zone. Substorms may be ordered by the preferred longitude of the dominant westward electrojet during their main phase and fall into three categories, morning, evening and midnight, which may occur simultaneously or independently. During recovery of these ten substorms the westward electrojet is always in the morning sector.
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Kroehl, H.W., Richmond, A.D. (1979). Magnetic Substorm Characteristics Described by Magnetic Potential Maps for 26 – 28 March 1976. 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_13
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DOI: https://doi.org/10.1007/978-94-009-9519-2_13
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