Energetic particle measurements during a Cluster crossing of a complex high altitude cusp

Physics

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2706 Cusp, 2720 Energetic Particles: Trapped, 2724 Magnetopause And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

The Cluster spacecraft were outbound over the Northern Hemisphere on 26 February 2001, at approximately 12:00 MLT, approaching the magnetosheath through the high-altitude cusp region. Due to motions of the cusp, the spacecraft made more than 11 crossings of the boundary of the cusp region before exiting into the magnetosheath. Previously reported studies of this period have compared two methods of 4-spacecraft boundary analysis, one using PEACE data and one using FGM data [Taylor, et al., Annales Geophysicae (2004) 22: 3707-3719]. A third method employing the existence of an energetic particle layer on the cusp boundary measured by the RAPID experiment is presented that permits both the motion of the boundary of this complex passage to be tracked in even greater detail and to establish the capability of the cusp to actually trap energetic electrons within the accompanying cusp diamagnetic cavities that are observed.

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