Formation of the Ring Current as a Function of Solar Wind Conditions

Details Formation of the Ring Current as a Function of Solar Wind Conditions Formation of the Ring Current as a Function of Solar Wind Conditions

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1743c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1743

Physics

7807 Charged Particle Motion And Acceleration, 7845 Particle Acceleration

Scientific paper

Single particle tracking using time-dependent global magnetic and electric fields from multifuild simulations is used to investigate the generation of the ring current from ionospheric outflows of both hydrogen and oxygen ions. Observations of the energization and trapping of different ionospheric ions show that the energization of the particles is highly dependent of the location of their source. Losses from convection towards the dayside magnetopause is one of the major factors inhibiting the formation of a symmetric ring current, and in order to enhance the access of the energetic particles into the inner magnetosphere, it is shown that a northward turning of the IMF is needed in addition to the preliminary southward IMF that initially accelerates the particle. The magnitude of northward turning does not significantly affect ring current formation as only subtle differences are observed between the northerly turning case (-5 nT to 0 nT) and the strongly northward turning case (-5 nT to 5 nT ). This result indicates that a reduction is the cross-polar cap potential of about 50% is need to reduce dayside convection and allow the formation of a symmetric ring current. We also show that the particles that form the ring current are accelerated by small scale processes within a thin (< 1000 km) current sheet and that simulations with coarse grid resolution underestimate the energization of the ring current particles.

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