Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa51a0242b&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA51A-0242
Physics
2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431)
Scientific paper
The Pedersen conductance is an important parameter that determines the intensity of currents coupling the ionosphere and the magnetosphere and the rate of electromagnetic energy exchange between the two. Short of running a full ionosphere/thermosphere model, studies of ionosphere/magnetosphere coupling are forced to rely on various sets of emperical or parameterized theoretical results to determine local or global conductance. Under steady state conditions Ampere's and Ohm's laws can be combined to obtain the relationship between magnetic perturbations and electric fields measured at satellite altitudes in regions of field-aligned currents. In intervals where E and δ B are highly correlated the height integrated Pedersen conductivity can be written as ΣP = (1/μo) Δ δ BZ/ Δ EY, and be determined directly from in situ measurements. We use this approach with magnetometer and driftmeter data from two DMSP satellites (F16 and F17) to determine Pedersen conductances under quiet to mildly distrubed conditions, in regions close to the terminator where solar illumination and particle (ion and electron) precipitation play competing roles in determing ionospheric conductivities. Results from this study are compared with commonly used expressions for conductances ( Robinson and Vondrak, 1984; Robinson et al., 1987) and results of numerical simulations.
Burke W.
Wilson Gordon Ray
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