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Burst of energetic O/sup +/ ions during an upstream particle event

Journal Article · · Geophys. Res. Lett.; (United States)
; ; ; ; ; ;
During an extended energetic particle event upstream of the earth's bow shock on September 5, 1984, a brief burst of energetic O/sup +/ ions have 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/sup +/ event coincides with a brief electron burst. O/sup +/ is predominantly streaming into the sunward direction, while the H/sup +/ and He/sup 2 +/ ions exhibit a net flow toward the bow shock with a second order anisotropy perpendicular to the interplanetary magnetic field (which was almost radial throughout the whole event). The energy spectrum of O/sup +/ is significantly harder than those of H/sup +/, He/sup 2 +/ and CNO (Q>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.
Research Organization:
Max-Planck-Instituf f. Physik u. Astrophysik, Institut f extraterrestrische Physik, 8046 Garching, FRG
OSTI ID:
7021872
Journal Information:
Geophys. Res. Lett.; (United States), Journal Name: Geophys. Res. Lett.; (United States) Vol. 13:13; ISSN GPRLA
Country of Publication:
United States
Language:
English

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Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
CHARGED PARTICLES
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
EARTH PLANET
ELECTRONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
FERMIONS
HELIUM IONS
HYDROGEN IONS
INTERPLANETARY MAGNETIC FIELDS
IONS
LEPTONS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
MAGNETIC STORMS
MEASURING INSTRUMENTS
OXYGEN IONS
PLANETS
SHOCK WAVES
SOLAR ACTIVITY
SOLAR WIND
SPECTRA
SPECTROMETERS
TIME-OF-FLIGHT SPECTROMETERS