Inner magnetosphere ion composition: global modeling and TWINS observations

Details Inner magnetosphere ion composition: global modeling and TWINS observations Inner magnetosphere ion composition: global modeling and TWINS observations

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm52a..05i&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM52A-05

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2753] Magnetospheric Physics / Numerical Modeling, [2778] Magnetospheric Physics / Ring Current

Scientific paper

The presence of oxygen, although short lived, in the inner magnetosphere has been known for quite some time. Its relatively short life compared to the hydrogen ions is mainly due to the significantly larger O+/H charge exchange cross section as well to the fact that O+ is efficiently lost to the atmosphere by pitch-angle scattering. Variations in the ion composition of the inner magnetosphere alter the dynamics of the plasma by changing the average lifetime of particle population. Although the ratio of hydrogen to oxygen has been shown to be highly dependent on geomagnetic activity, a global view of the oxygen injection is not yet possible to obtain using observations only. Therefore the timing and the injection mechanisms as well as the loss of O+ from the ring current are still subject to debate. The TWINS ENA imagers can distinguish between the major ion constituents of the ring current, providing a new capability for studying the composition of the ring current. Combining TWINS images with modeling of the global magnetosphere opens up the possibility for global viewing of ring current composition. Simulations using the Space Weather Modeling Framework (SWMF) involving composition measurements from TWINS are used to investigate the global dynamics and energization of ions throughout the whole magnetosphere and to address the impact of inner magnetosphere ion composition on the physical processes that dominate this region.

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