Origins of energetic ions in the cusp

Details Origins of energetic ions in the cusp Origins of energetic ions in the cusp

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106.5967t&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A4, p. 5967-5976

Physics

19

Interplanetary Physics: Energetic Particles, Planetary, Interplanetary Physics: Planetary Bow Shocks, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers

Scientific paper

Recent studies reported on a new magnetospheric phenomenon called cusp energetic particle (CEP) events. It has been suggested that these energetic particles with significant fluxes up to several hundred keV/e are accelerated locally in the cusp. An alternative explanation for the energetic particle events is that they are accelerated at the quasi-parallel bow shock, then transported downstream and enter the cusp along newly reconnected field lines or some other solar wind entry mechanism. It is well known that shock-accelerated ions have characteristic abundance ratios, composition ratios relative to the solar wind composition, temperatures, and spectral dependency on solar wind conditions. These parameters are used to distinguish between a local (cusp) and remote (bow shock) acceleration. Our results show that average values of these parameters in the cusp are comparable to those at quasi-parallel shocks. Furthermore, changes in some of these parameters indicate a solar wind entry process that depends on energy and mass. No local acceleration is required to explain the observed CEP events up to 150 keV/e. For ions above 150 keV/e the magnetosphere itself may be responsible for the observed cusp fluxes.

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