Three-dimensional energetic ion observations and the tangential magnetopause electric field |
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Authors: | D J Williams T A Fritz E Keppler B Wilken G Wibberenz |
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Institution: | (1) NOAA Space Environment Laboratory, Boulder, Colo, USA;(2) Max Planck Institute for Aeronomy, Lindau, Germany;(3) University of Kiel, Kiel, Germany |
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Abstract: | Three-dimensional distributions for 24.0–44.5 keV protons (ions) are presented from the ISEE-1 medium energy particles instrument during a magnetopause traversal at 01:10 UT on 20 November 1977. Local time of the traversal was 1030. Ion fluxes were observed coming generally from the subsolar region, but over a wide range of latitudes. Enhanced fluxes were observed at the magnetopause crossing with strong components from the subsolar region and from the +Z
SE direction. These observations are compared with the simultaneous electric field observations presented by Mozer et al. (1978). Ion streaming in a direction consistent with the Y-component of the
drift velocity was observed whereas streaming along the X and Z-components is not seen. Based on energy arguments we conclude that in this case, 24 keV ions are not the major energy carrier of the locally measured · dissipation. |
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