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Detailed Reference Information |
Villante, U., Piersanti, M., Di Giuseppe, P., Vellante, M., Zhang, T.L. and Magnes, W. (2005). Sudden commencement event of 17 April 2002: Aspects of the geomagnetic response at low latitudes. Journal of Geophysical Research 110. doi: 10.1029/2004JA010978. issn: 0148-0227. |
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An analysis of a sudden commencement (SC) manifestation reveals a significant contribution of the polar current system which influences the long-term behavior of the H component at low-latitude ground stations located in the subsolar sector. A transition between "morning" and "afternoon" characteristics of the geomagnetic response occurs at ≈1300 MLT. "Morning" events are characterized by a positive then negative variation (P/N) preceding the longer-term variation and show a gentle latitudinal decrease of the asymptotic response; conversely, "afternoon" events, which are characterized by a N/P structure, show a steep latitudinal gradient. PPI and PRI structures are observed on opposite sides of the ≈1300 MLT boundary. The PPI consists of three dominant fluctuations at well-defined frequencies and the small differences in the signal manifestation at nearby stations can be imputed to the occurrence of local resonance phenomena. Large-amplitude pulsations appear soon after the SC occurrence at subauroral latitudes. |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Magnetospheric Physics, Solar wind/magnetosphere interactions, Magnetospheric Physics, Magnetospheric configuration and dynamics, Ionosphere, Ionosphere/magnetosphere interactions, Magnetospheric Physics, Field-aligned currents and current systems, magnetospheric physics, sudden impulses, ionospheric current system |
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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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