Energetic particle bursts first detected by the Mariner 10 probe, but not detected by Messenger during its flybys. Messenger found that these are electrons instead of ions, at occur at modest latitudes and occurred regularly through each of its orbits. One possible explanation is that they are caused by a double layer in the magnetic field or by the rapidly changing magnetic field structure.
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Energetic Particle Events Due to Electrons (Jun 2011)