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Coordinated ground-based and Cluster observations of large amplitude global magnetospheric oscillations during a fast solar wind speed interval

Balogh, A.; Bale, S. D.; Yeoman, T. K. +10 more

We present magnetospheric observations of very large amplitude global scale ULF waves, from 9 and 10 December 2000 when the upstream solar wind speed exceeded 600 km/s. We characterise these ULF waves using ground-based magnetometer, radar and optical instrumentation on both the dawn and dusk flanks; we find evidence to support the hypothesis that…

Cluster magnetic field observations at a quasi-parallel bow shock

Balogh, A.; Horbury, T. S.; Lucek, E. A. +7 more

We present four-point Cluster magnetic field data from a quasi-parallel shock crossing which allows us to probe the three-dimensional structure of this type of shock for the first time. We find that steepened ULF waves typically have a scale larger than the spacecraft separation ( ~ 400 1000 km), while SLAMS-like magnetic field enhancements have d…