How Does the Ring Current and the Inner Magnetospheric Electric Fields Control Each Other?

Details How Does the Ring Current and the Inner Magnetospheric Electric Fields Control Each Other? How Does the Ring Current and the Inner Magnetospheric Electric Fields Control Each Other?

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm53a..05b&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM53A-05

Physics

2712 Electric Fields (2411), 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The ring current plays a unique role in the production of the electric field of the inner magnetosphere. Pressure and magnetic field gradients are associated with electrical currents that close through the ionosphere, responsible for maintaining the electric field of the inner magnetosphere in a self-consistent way. This type of global magnetosphere-ionosphere coupling is currently modeled by many groups. Global energetic neutral atom (ENA) observations of the ring current provide the reality against which the models are validated. Data-model comparison is the method by which knowledge of the inner magnetospheric electric field is obtained. The results depend on how wide of an energy range and angular resolution the data can provide. The High- and Medium Energy Neutral Atom (MENA and HENA) imagers on board the IMAGE spacecraft has provided us with almost six years of data from ~1 keV to about 200 keV for hydrogen and ~50 to about 300 keV for oxygen. We aim at retrieving the morphology (local-time and radial position of the ring current ion intensity peak) of the ring current for the full energy range for most of the mission and statiscally bin the location as a function of solar wind conditions and season. We also investigate how the ring current morphology depends on cross-polar cap potential, auroral oval size, and ring current strength.

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