A possible sustained signature of a gyrophase‐bunched electron distribution just upstream of the Earth's bow shock is presented. The data, obtained by the ISTP WIND 3‐D Plasma and Energetic Particle Experiment, show several clear examples of a non‐gyrotropic, energetic electron distribution moving into the upstream. The signature is probably that of a locally phase‐trapped electron distribution.
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Gurgiolo et al. (2000) studied this question.
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