Effects of high-latitude ionospheric electric field variability on global thermospheric Joule heating and mechanical energy transfer rate

Details Effects of high-latitude ionospheric electric field variability on global thermospheric Joule heating and mechanical energy transfer rate Effects of high-latitude ionospheric electric field variability on global thermospheric Joule heating and mechanical energy transfer rate

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa33a1065m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA33A-1065

Mathematics

Logic

2411 Electric Fields (2712), 2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736)

Scientific paper

Effects of high-latitude ionospheric electric field variability on the estimation of Joule heating and mechanical energy transfer rate are investigated by incorporating realistic spatial and temporal characteristics of electric field variability derived from observations into the forcing of a thermosphere and ionosphere electrodynamics general circulation model. First, the characteristics of sub-grid scale variability are examined from a spectral analysis of Dynamic Explorer-2 (DE-2) plasma drift measurements. The analysis reveals that the sub-grid scale electric field varies with magnetic altitude, magnetic local time, interplanetary magnetic field, and season in a manner distinct from that of the resolved-scale electric field and of the climatological electric field. Second, the spatial-temporal structure of resolved-scale electric fields are characterized from various electromagnetic observations taken during the storm period of January 10-11, 1997, using a space-time separable covariance model derived from the DE-2 observations. Finally, the modeling results show that the estimated amount of Joule heating in the thermosphere is significantly altered by taking into account the electric field variability and its space-time structure.

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