Physics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10903214h&link_type=abstract
Journal of Geophysical Research, Volume 109, Issue A3, CiteID A03214
Physics
1
Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Auroral Phenomena (2407)
Scientific paper
The main purpose of this report is to present a solution to the problem of how the observed quasi-stationary downward flow of ions through a potential difference between the magnetosphere and the ionosphere, ions which originate below the potential difference, can be understood. First, a summary of the observations of downward accelerated ions with keV or sub-keV energies at altitudes of ~1700 km is given and the mechanism causing the accelerating quasi-static potential difference is described. Thereafter it is shown that the ionospheric ions may be transported upward through the potential region in a process sometimes called the ``pressure-cooker'' mechanism involving wave turbulence within the region. The turbulence also gives rise to pitch-angle scattering of the ions so that a fraction of them are precipitated into the altitude range where they are observed by the satellite. This process gives the observed spectral characteristics of the accelerated ions.
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