Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa13a1086k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA13A-1086
Physics
2411 Electric Fields (2712), 2494 Instruments And Techniques
Scientific paper
The dynamical behavior of the ionosphere is dominated at high latitudes by coupling to the magnetosphere, and at low latitudes by coupling to neutral winds. Magnetospheric forcing leads to highly structured plasma flows on spatial scales of one kilometer or less, particularly in the vicinity of auroral arcs; intrinsic plasma instabilities impose further plasma structure at all latitudes. All of these phenomena can be clarified through direct observations of the electric fields that mediate them. The European Space Agency's Swarm mission will make continuous global measurements of geo-electromagnetic fields during a four-year mission to begin in 2010. Electric Field Instruments (EFIs) on each of Swarm's three satellites will measure electric fields through vector ion drift measurements having a precision of 5 m/s and at rates of up to 16 vectors/second, or every 500 m along the orbit. The combination of precision electric and magnetic fields can be used to estimate low-frequency Poynting flux with a resolution of 1 μW/m2, sufficient to detect outward-propagating electromagnetic disturbances generated by gravity waves in the neutral atmosphere, for example, or to clarify the subtle interplay between electric and magnetic fields that leads to auroral arcs. This talk will overview the scientific potential of Swarm's electric field measurements along with the technical developments that underlie them.
Burchill J. K.
Knudsen David J.
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