Possible detection of low energy ions and electrons from planet Mercury by the HELIOS spacecraft

Physics

Scientific paper

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Helios Satellites, Mercury (Planet), Planetary Atmospheres, Planetary Magnetospheres, Radiation Belts, Solar Wind, Bow Waves, Electron Sources, Flux (Rate), Ion Sources, Magnetic Field Configurations, Shock Waves

Scientific paper

The incidence occurring in May 1979 when the Helios-2 spacecraft, located upstream of the magnetosphere of Mercury, was able to detect low energetic ion (greater than 80 keV) and electron (greater than 60 keV) fluxes coming from the direction of the Hermean magnetosphere, and propagating towards the sun, is reported. It is shown that the fluxes are statistically significant in the sense that they are 2-5 times the statistical error. It is concluded that the observed particles are of direct magnetospheric origin produced by substorm activities or are released from the radiation belts of Mercury. Solar-wind particles reflected from and accelerated at the bow shock of Mercury are excluded.

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