Physics – Plasma Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11307222p&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A7, CiteID A07222
Physics
Plasma Physics
10
Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Particle Acceleration, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Numerical Modeling, Space Plasma Physics: Particle Acceleration
Scientific paper
We report hemispheric average fluxes and energies of outflowing energetic (0.015 < E/q < 33 keV) H+, O+, and He+ ions in dynamic boundary-related coordinates, from observations obtained by the Polar/TIMAS instrument near 6000 km altitude in the southern hemisphere during quiet geomagnetic intervals at solar minimum. We discuss our observations in terms of known energization and transport processes. We find that only a small fraction of energetic ions escape from the ionosphere directly into the polar cap and at quiet times the characteristic energies of escaping H+ are between 30 and 300 eV in the cusp region and between 30 eV and 1.2 keV in the midnight sector. For O+ we conclude the characteristic energy in the cusp is ~100 eV and between 150 and 600 eV in the midnight sector. Our data suggest that the relative energization and acceleration of O+ is significantly different in the noon quadrant. The observations and analysis presented here also suggest that O+ has activity dependent transport paths from the ionosphere to the ring current that have not previously been identified.
Andersson L.-L.
Callahan B. C.
Collin Henry L.
Peterson William K.
Scudder Jack D.
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