Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2049l&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 12, p. 2049-2052
Physics
27
Magnetospheric Physics: Auroral Phenomena, Ionosphere: Particle Acceleration, Ionosphere: Wave/Particle Interactions, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions
Scientific paper
The TEAMS instrument on the FAST satellite has detected events in which He+ ions are resonantly accelerated perpendicular to the magnetic field to energies of several keV. The events occur in association with electromagnetic ion cyclotron (EMIC) waves and conic distributions of up to a few hundred eV in H+ and a few keV in O+. Concentrations of He+ can be significantly elevated during the events. Our interpretation is that the He+ ions are accelerated through a cyclotron resonance with the waves. This acceleration is similar to a proposed mechanism for selective ion acceleration in impulsive solar flares.
Carlson Carl W.
Cattell Cynthia A.
Elphic Richard C.
Ergun Robert E.
Hovestadt Dieter
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