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Particles upstream of the pre-dawn bow shock - ISEE-3 observations

Journal Article · · Geophys. Res. Lett.; (United States)
; ; ; ; ; ; ; ;
The first observations of energetic ions (equal to or greater than 30 keV) in the region upstream of the pre-dawn bow shock (X between 0 and -60 Re inclusively) are presented. The intensity in this region is controlled by the direction of the interplanetary magnetic field (IMF) and is maximized when the IMF is around the spiral direction. The particle distributions are highly anisotropic with the anisotropy directed perpendicular to the magnetic field. In the E x B frame this perpendicular anisotropy is conserved and it is argued that the distribution is pancake-like. This indicates that the energetic particles in the pre-dawn upstream region have their origin in the near-earth upstream region, from where they are convected by the solar wind perpendicular to the magnetic field. It is therefore concluded that acceleration occurs mainly near the nose of the bow shock, and particle acceleration at the distant bow shock is weak. 15 references.
Research Organization:
Tokyo Univ., Japan; Max-Planck-Institut fuer Extraterrestrische Physik, Garching, West Germany; Maryland Univ., College Park; ESA, Noordwijk, Netherlands; California Institute of Technology, Pasadena
OSTI ID:
6422963
Journal Information:
Geophys. Res. Lett.; (United States), Journal Name: Geophys. Res. Lett.; (United States) Vol. 12; ISSN GPRLA
Country of Publication:
United States
Language:
English

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Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATION
ALPHA PARTICLES
ANGULAR DISTRIBUTION
ANISOTROPY
BARYONS
CHARGED PARTICLES
DISTRIBUTION
ELEMENTARY PARTICLES
EXPLORER SATELLITES
FERMIONS
HADRONS
INTERPLANETARY MAGNETIC FIELDS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
NUCLEONS
PROTONS
RADIATIONS
SATELLITES
SHOCK WAVES
SOLAR ACTIVITY
SOLAR PARTICLES
SOLAR PROTONS
SOLAR RADIATION
SOLAR WIND
STELLAR RADIATION