Evidence for particle acceleration processes in the magnetotail

Physics

Scientific paper

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Energetic Particles, Geomagnetic Tail, Particle Acceleration, Plasma Diagnostics, Space Plasmas, Bursts, Explorer 50 Satellite, Plasma Heating, Satellite Observation, Spectral Energy Distribution

Scientific paper

Measurements of energetic protons (E greater than or equal to 50 keV), electrons (E greater than or equal to 30 keV), alpha particles (E greater than or equal to 0.64 MeV) and Z greater than or equal to 3 particles (E greater than or equal to 2 MeV) in the distant magnetotail by the Energetic Particle Experiment (NOAA, Boulder) and the JHU/APL proton-electron telescope on board the IMP 8 satellite for the period November 23-26, 1973, are used to investigate the particle acceleration process in the magnetotail. Evidence is presented that the plasma heating process starts 20-30 min before energetic particle bursts, which suggests that most probably the particle energization in this event takes place in two different phases: (1) up to E approximately 50 keV in association with the plasma heating process and (2) explosive acceleration in excess of E greater than or approximately equal to 1 MeV energy.

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