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Figure 2.8. The association of foreshock wave activity with quasi-parallel shock geometries. The top panel shows 6gn for the magnetic field line that connects Cluster 1 to the shock as a function of time (yellow line shows 120 s averages of 6gn). The second panel shows the shock Cluster separation, along the magnetic field observed at Cluster. The bottom three panels show the magnetic field in GSE polar coordinates. The onset of wave activity (as seen in the bottom three panels) corresponds to a change in the IMF orientation, such that the Cluster spacecraft become connected to quasiparallel shock geometries. This is consistent with previous statistical studies. (Figure provided by J. P. Eastwood).

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Figure 2.8. The association of foreshock wave activity with quasi-parallel shock geometries. The top panel shows 6gn for the magnetic field line that connects Cluster 1 to the shock as a function of time (yellow line shows 120 s averages of 6gn). The second panel shows the shock Cluster separation, along the magnetic field observed at Cluster. The bottom three panels show the magnetic field in GSE polar coordinates. The onset of wave activity (as seen in the bottom three panels) corresponds to a change in the IMF orientation, such that the Cluster spacecraft become connected to quasiparallel shock geometries. This is consistent with previous statistical studies. (Figure provided by J. P. Eastwood).

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