Field line topology in the dayside cusp region inferred from low altitude particle observations

Physics

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Cusps, Electron Precipitation, Lines Of Force, Magnetic Field Configurations, Proton Precipitation, Satellite Observation, Topology, Daytime, Electron Energy, Energy Distribution, Geomagnetism, Magnetosheath, Plasma Sheaths, Proton Energy

Scientific paper

Dayside low altitude satellite observations of the pitch angle and energy distribution of electrons and protons in the energy range 1 eV to 100 eV during quiet geomagnetic conditions reveal that at times there is a clear latitudinal separation between the precipitating low energy (keV) electrons and protons, with the protons precipitating poleward of the electrons. The high energy (100 keV) proton precipitation overlaps both the low energy (keV) electron and proton precipitation. These observations are consistent with a model where magnetosheath particles stream in along the cusp field lines and are at the same time convected poleward by an electric field.

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