Energetic electron detection in Mercury's magnetosphere with the MESSENGER Gamma-Ray Spectrometer

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The MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft entered a ~12-hr orbit around Mercury on 18 March 2011. Following instrument turn-on, several instruments in the payload began detecting energetic electrons with energies from < ~30 keV to > ~300 keV. In addition to direct measurements with the Energetic Particle Spectrometer (EPS) component of the Energetic Particle and Plasma Spectrometer (EPPS) [1], bursts of hard X-rays have been measured in the sensors of the Gamma-Ray and Neutron Spectrometer (GRNS) [2] and soft X-rays in the X-ray Spectrometer (XRS) [3], consistent with bremsstrahlung from in situ electrons [4]. Accumulated evidence to date corroborates the XRS data from the MESSENGER flybys, as well as the inference of bursts of energetic electrons identified during the first Mercury flyby of Mariner 10 [5-7].

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