Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72b0615s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM72B-0615
Physics
0358 Thermosphere: Energy Deposition, 2411 Electric Fields (2712), 2463 Plasma Convection, 2736 Magnetosphere/Ionosphere Interactions
Scientific paper
Variability in the high latitude convection electric field can significantly impact the amount of Joule heating that occurs in the upper atmosphere. Little, however, is known about the character of this variability. Using line-of-sight velocity drift measurements from the Super Dual Auroral Radar Network (SuperDARN), we characterize the nature of the temporal electric field variability for several recent periods. The broad spatial extent in magnetic latitude and magnetic local time of the SuperDARN field-of-view allow this variability to be related to global features such as the convection throat and the convection reversal boundary. It is therefore possible to determine and compare the statistical magnitude of the variability in these distinct regions as well as to estimate both the temporal and spatial coherence lengths of the observed variability. We show examples of variability and their coherence lengths for several different regions of the high latitude.
Ruohoniemi Michael J.
Shepherd Simon G.
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