What controls energetic oxygen in the inner magnetosphere?

Details What controls energetic oxygen in the inner magnetosphere? What controls energetic oxygen in the inner magnetosphere?

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41b2025k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM41B-2025

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner

Scientific paper

The ion composition plays a significant role in magnetospheric dynamics and ring current development during geomagnetic activity. It is, for example, important to include the observed ion composition into ring current models or consider it in calculations of the plasma instabilities. We investigate the oxygen to proton ratio in the plasma sheet region of the Earth's inner magnetosphere. The results are based on 7 years of ion flux measurements in the energy range ~10 keV (intermediate) to ~1 MeV (energetic) from the RAPID and CIS instruments on board the Cluster satellites. We found that (1) Short time disturbances associated with substorm, reflected by the AE index and storm activity, reflected by a more negative Dst index, show a positive correlation with the oxygen to proton ratio. Under strongly disturbed conditions the flux of energetic oxygen can be as high as, or higher than the flux of protons; (2) The southward directed IMF, favourable for magnetic reconnection at the dayside magnetosphere is associated with energetic oxygen intensity higher than proton intensity; (3) The ion composition maps show dawn-dusk assymetries which change under different disturbance levels. As a conclusion, much of the observations indicate that the ionosphere is an important source and that disturbed conditions/high activity seems to favour oxygen outflow/acceleration.

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