Partial penetration of IMF By into the magnetosphere |
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| Authors: | F Primdahl |
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| Institution: | Danish Space Research Institute, Lundtoftevej 7, DK-2800 Lyngby, Denmark |
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| Abstract: | Recent observations of partial penetration of the IMF By into the magnetosphere (Fairfield, 1979; Cowley and Hughes, 1983) are shown to agree with the idea of a magnetopause current Ky, induced by IMF By (Primdahl and Spangslev, 1983). The slow decay of Ky, caused by Joule heat losses in the cusp ionospheres is responsible for the appearance (on the average) of a fraction of IMF By inside the magnetosphere, and this also explains the large statistical scatter of the data. A decay time constant of 4–5 days is derived from the average fraction of IMF By observed inside the magnetosphere in good agreement with the 7-day time constant previously proposed. |
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