Observations of energetic particles in the dayside magnetosphere by Cluster-II

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Scientific paper

Around vernal equinoxes the Cluster-II satellites have their apogee in the noon sector, passing through the dayside high-latitude magnetosphere. In an earlier event study using the Cluster-II/Rapid instrument we have shown that there is a considerable flux of energetic particles in the closed field lines of the high-latitude magnetosphere. Instead, contrary to earlier observations of high fluxes of energetic particles in the high-altitude cusp, we found a very low flux of energetic particles in this region. Here we study the fluxes of energetic particles over a number of Cluster-II orbits in the dayside high-latitude magnetosphere and the surrounding plasma environments, in particular in the cusp/cleft region and in the dayside magnetospheric boundary. We will compare the observations during different solar wind conditions and different orientations of the interplanetary magnetic field. We will also derive the speed and direction of the moving dayside magnetopause using observations of energetic particles and plasma density.

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