Abstract
Observations of the entry of electrons through the magnetopause and their travel down field lines to the low-altitude polar cusp are reviewed. The evidence is strongly in favour of there being a small region, located poleward of 80° magnetic latitude near noon in quiet times within which electrons have direct access from the magnetosheath. It is more difficult to determine the source of the electrons precipitating in a ring just equatorward of the direct access electrons. While they have some characteristics in common with electrons observed in the boundary layer of the low latitude magnetopause, they also show the signature of acceleration, probably occurred at low altitudes. It is not clear whether these electrons, observed on the dayside, should be distinguished from those coming from the nightside boundary-layer of the plasma sheet. More detailed observations are required to determine the origin of this type of precipitation.
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© 1985 D. Reidel Publishing Company
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Johnstone, A.D. (1985). Electron Injection in the Polar Gusp. In: Holtet, J.A., Egeland, A. (eds) The Polar Cusp. NATO ASI Series, vol 145. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5295-9_4
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DOI: https://doi.org/10.1007/978-94-009-5295-9_4
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