Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2029m&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 12, p. 2029-2032
Physics
14
Ionosphere: Particle Acceleration, Ionosphere: Wave/Particle Interactions, Magnetospheric Physics: Auroral Phenomena, Ionosphere: Ion Chemistry And Composition
Scientific paper
Upward flowing field-aligned ion beams over auroral arcs have been observed with the 3-dimensional ion mass spectrograph TEAMS on FAST. We have performed a statistical study on a sample of 77 ion beams from the auroral campaign in early 1997. All observed beams contain substantial amounts of H+, He+ and O+. A clear ordering of the total energies according to mass is found, with H+ having the lowest and O+ the highest energy. The composition varies significantly from beam to beam, with O+/H+ ratios ranging from ~0.1 to 10. No variation of the energy ratio between species is observed as a function of relative abundance. These results are discussed in the light of earlier observations of higher energies for O+ in statistical studies of beams during solar minimum and attempts to explain this behavior in terms of beam instabilities.
Carlson Carl W.
Cattell Cynthia
Elphic Richard
Ergun Robert
Hovestadt Dieter
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