Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31c..08r&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM31C-08
Other
2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics
Scientific paper
Earth's ionosphere is often thought of being a projection screen for magnetospheric processes, where the mapping is determined by the topology of the magnetic field. This implicitly assumes that particles and currents flow along field lines over large distances. However, particles may convect perpendicular to the field and currents -- even if they flow perfectly along field lines at ionospheric altitudes -- must eventually diverge from the field. In this presentation we examine the validity of the assumptions that are underlying magnetic mapping using global simulations of the magnetosphere-ionosphere system. In particular, we address the question to what distance currents flow along field lines, how electric fields affect the mapping of particles, and how the mapping depends on the state of the magnetosphere, the solar wind, and the interplanetary magnetic field. We also compare the mapping derived from the global simulation model with those derived using other methods, such as empirical field models.
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