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Detailed Reference Information |
Trivedi, N.B., Sibeck, D.G., Zesta, E., Santos, J.C., Yumoto, K., Kitamura, T., Shinohara, M. and Dutra, S.L.G. (2002). Signatures of traveling convection vortices in ground magnetograms under the equatorial electrojet. Journal of Geophysical Research 107: doi: 10.1029/2001JA000153. issn: 0148-0227. |
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Traveling convection vortices (TCVs) are transient events in high-latitude ground magnetograms that can be interpreted as evidence for localized vortical flows in the high-latitude ionosphere. Their centers travel eastward or westward at geomagnetic latitudes near 72¿ to 74¿. TCVs have been attributed to various transient interactions at the magnetopause but also to processes occurring deeper within the magnetosphere. Each interaction mechanism should launch shear Alfv¿n waves that produce high-latitude ground signatures but also compressional waves that should produce signatures at lower latitudes. Zesta et al. <1999>, Moretto et al. <1997>, Ridley et al. <1998>, and L¿hr et al. <1998> report detailed analyses for several high-latitude TCVs. In this paper, we present evidence for corresponding signatures at Belem, S¿o Luis, and Teresina and other stations under or nearby the equatorial electrojet. The equatorial signatures are most pronounced when the high-latitude signatures are (1) longitudinally extended, (2) isolated, and (3) attain greatest amplitudes. |
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Abstract |
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Keywords
Magnetospheric Physics, Magnetopause, cusp, and boundary layers, Magnetospheric Physics, Magnetosphere/ionosphere interactions, Magnetospheric Physics, Plasma convection, Magnetospheric Physics, Solar wind/magnetosphere interactions |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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