Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33c..05c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA33C-05
Other
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions
Scientific paper
Joule heating by high latitude electric fields is thought to be underestimated by models, and it has been conjectured that the source of the underestimation is “electric field variability,” although the interpretation of this term is not necessarily straightforward. Some researchers characterize electric field variability as “real physical variability” of the electric field at “small scales,” whereas others lump-in what might better be described as “model error.” In addition, the degree of correlation between the electric field strength and the ionospheric conductance enters the problem of estimating the Joule heating rate, but has been little considered. The probable impact of these three factors on estimating the Joule heating rate will be discussed, as informed by analysis of the Sondrestrom radar data base, and a comparison with AMIE model results. A project to directly model the Joule heating rate using satellite measurements of Poynting flux will also be discussed.
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