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首页> 外文期刊>Journal of geophysical research >Identification of the poleward boundary of the auroral oval using characteristics of ion precipitation
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Identification of the poleward boundary of the auroral oval using characteristics of ion precipitation

机译：Identification of the poleward boundary of the auroral oval using characteristics of ion precipitation

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Electron and ion precipitation data from DMSP F6 and F7 spacecraft are compared in the polar region for B-z 0. We used the electron and ion number fluxes averaged over 0.5 degrees latitude, normalized by the respective flux maxima in each crossing. Analysis of these averaged and normalized fluxes shows that two regions of large-scale precipitation are present. The first is the ''regular'' auroral oval, where electron and ion precipitation is highly correlated irrespective of interplanetary magnetic field (IMF) polarity. The other is the polar cap, wherein for B-z > 0 the diffuse electron and ion precipitation is one or more orders of magnitude weaker than in the oval, although isolated spikes of accelerated electrons occur, and for B-z 0. Using this criterion, the poleward boundary of the polar cap can be defined computationally. It is suggested that for northward IMF, the poleward boundary of the oval may represent the mapping of a separatrix which, according to recent research results, can exist inside a closed magnetosphere at large distances (similar to X = -100 R(E)), namely, where a divergence exists between plasma flowing sunward and antisunward.

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