Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa23b..02h&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA23B-02
Physics
2409 Current Systems (2721), 2431 Ionosphere/Magnetosphere Interactions (2736), 7954 Magnetic Storms (2788)
Scientific paper
Poynting flux is the major source of energy input into the upper ionosphere during active periods, far exceeding particle precipitation. Our studies have shown that TeraJoules of electromagnetic energy can be dissipated in the ionosphere over a period of a few minutes, a factor of five times the energy due to auroral particle precipitation. This energy is converted into Joule and frictional heating of the ionosphere. During this same period, ground magnetometers traces indicate currents an order of magnitude less than those detected by DMSP at 800 km altitude. Without in situ measurements, the energy input to the ionosphere cannot be assessed and thus the effect of magnetic activity on the ionosphere and thermosphere cannot be predicted with accuracy. A comparison of observed and predicted neutral densities illustrates the failure of current models to forecast stormtime effects on the atmosphere.
Burke William J.
Huang Chang-Yin
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