Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004p%26ss...52..561m&link_type=abstract
Planetary and Space Science, Volume 52, Issue 5-6, p. 561-572.
Physics
Jupiter, Magnetosphere, Magnetopause, Boundary Layer, Spectral Variations
Scientific paper
An important finding of Ulysses flyby of Jupiter is the discovery of a large-scale energetic particle layer adjacent to the magnetopause. Previous studies discussed the particle flux and the anisotropy characteristics of this layer. This study examines the spectral characteristics of the large-scale magnetopause boundary layer of energetic particles. Examination of Ulysses' observations in the Jovian outer magnetosphere reveals the following picture of energetic ions: (1) The ion flux increases and the spectrum hardens in the direction from the magnetosheath/magnetopause toward the outer magnetosphere. (2) At middle latitudes, the energy spectrum is continuous and is well described by a power law (dj/dE=kE-γ), with a spectral index γ ranging between ~2.0 and ~2.5 over the whole energy range (~60 to ~4000keV). (3) Close to the magnetopause the spectrum is described by a power law, but with a different slope at low (<~400keV) and higher (>~400keV) energies. (4) The ion spectrum near the magnetopause is in general softer than far from the magnetopause (γ≅~2.6 to ~3.4 at energies >~400keV). (5) The spectral shape varies with a period of ~5 or 10h. The observations are explained in terms of a periodic motion of the s/c within the large-scale boundary layer of energetic ions in the outer magnetosphere. This boundary was more evident in the duskside south magnetosphere and was found to extend in radial distances from ~49Rj to 83Rj in this area.
Anagnostopoulos G. C.
Marhavilas Panagiotis K.
Sarris Emmanuel T.
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