Ion jetting at the plasma sheet boundary - Simultaneous observations of incident and reflected particles

Details Ion jetting at the plasma sheet boundary - Simultaneous observations of incident and reflected particles Ion jetting at the plasma sheet boundary - Simultaneous observations of incident and reflected particles

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..987a&link_type=abstract

Geophysical Research Letters, vol. 8, Sept. 1981, p. 987-990. Bundesminsterium für Forschung und Technologie

Physics

42

Incident Radiation, Ion Motion, Particle Trajectories, Plasma Layers, Electric Fields, Energy Spectra, Geomagnetic Tail, International Sun Earth Explorer 2, Neutral Sheets

Scientific paper

Observations of earthward and tailward streaming nonthermal energetic ions near the edge of the plasma sheet are presented. Measurements of electrons and ions were made over the energy range 25 keV-2.5 MeV with the WAPS detector on board ISEE-2. The data show strong earth-directed ion jetting at the plasma sheet boundary, with the most energetic particles lying furthest from the neutral sheet. Nonthermal ion spectra were also observed in particles moving outward from the earth, with spectral peaks consistently higher than those of the inward-moving particles. The tail-directed flux is interpreted as protons reflected back down the tail at the sheet boundary. It is argued that the dispersion effects resulted from a combination of a tailward moving energetic particle source and a cross-tail electric field which moves material down towards the neutral sheet.

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