Evidence for ion energy dispersion in the polar cusp related to a northward-directed IMF |
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Authors: | JM Bosqued JA Sauvaud H Rème J Crasnier YuI Galperin RA Kovrazhkin VA Gladyshev |
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Institution: | 1. Centre d''Etude Spatiale des Rayonnements, CNRS, Toulouse University, Toulouse, France;7. Space Research Institute (IKI), U.S.S.R. Academy of Sciences, Moscow, USSR |
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Abstract: | Data from the particle experiment aboard the AUREOL-3 polar satellite show that about 30% of the summer cusp crossings are characterised by a clear latitudinal energy dispersion of the solar wind ions. This energy-latitude correlation is observed at very high latitudes, 80° – 85°, near the polar boundary of the cusp, as an increase of the ion average energy with latitude. These structures have a typical latitude extent of 1° – 2° at ionospheric heights and correspond to a northward-directed IMF. These observations are consistent with a sunward convection of the foot of the magnetic flux tubes recently merged with a northward directed interplanetary magnetic field. |
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