Observation of low energy protons in the geomagnetic tail at lunar distances

Astronomy and Astrophysics – Astronomy

Scientific paper

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Geomagnetic Tail, Solar Protons, Magnetospheric Proton Density, Plasma Dynamics, Plasma Flux Measurement, Solar Wind, Thermal Plasmas

Scientific paper

Three suprathermal ion detectors stationed on the moon were used to detect a region of plasma flowing antisunward along the ordered field lines of the geomagnetic tail, exterior to the plasma sheet. The particle flow displays an integral flux, a bulk velocity, temperatures, and number densities uniquely different from the other particle regimes traversed by the moon. No consistent deviation in the field was found to correspond with the occurrence of the events, which have an angular distribution extending between 50 and 100 deg and a spatial distribution over a wide region in both the Ysm and Zsm directions. The duration of observable particles varies widely between tail passages, with an apparent correlation between the number of hours of observation and the Kp index averages over these times. It is proposed that these particles may have entered through the cusp region.

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