A burst of energetic O(+) ions during an upstream particle event

Details A burst of energetic O(+) ions during an upstream particle event A burst of energetic O(+) ions during an upstream particle event

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1372m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, Dec. 1986, p. 1372-1375.

Physics

36

Ampte (Satellites), Bow Waves, Energetic Particles, Oxygen Ions, Positive Ions, Energy Spectra, Helium Ions, Hydrogen Ions, Ion Distribution, Ion Injection

Scientific paper

During an extended energetic particle event upstream of the earth's bow shock on September 5, 1984, a brief burst of energetic O(+) ions has been observed using the time-of-flight spectrometer SULEICA on the AMPTE/IRM spacecraft. The event occurred during very active geomagnetic conditions. The onset of the O(+) event coincides with a brief electron burst. O(+) is predominantly streaming in the sunward direction, while the H(+) and He(2+) ions exhibit a net flow toward the bow show with a second-order anisotropy perpendicular to the IMF (which was almost radial throughout the whole event). The energy spectrum of O(+) is significantly harder than those of H(+), He(2+), and CNO (Q greater than 2). The observations of two particle populations, different in temporal evolution, anisotropies, and energy spectra, are discussed in terms of bow-shock-accelerated ions over the entire time period accompanied by a brief injection of magnetospheric particles.

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