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

Journal Article · Mon Dec 01 00:00:00 EST 1986 · Geophys. Res. Lett.; (United States)

DOI:https://doi.org/10.1029/GL013i013p01372· OSTI ID:7021872

Moebius, E; Hovestadt, D; Klecker, B; Scholer, M; Ipavich, F M; Carlson, C W; Lin, R P

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), Vol. 13:13
• Country of Publication: United States
• Language: English

Related Subjects

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