HR: 0800h
AN: GP31A-0066    [Abstracts]
TI: A Wavelet Approach to the Analysis of Auroral Electrojet (AE) Index.
AU: * De Michelis, P
EM: demichelis@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, Roma, Ita I-00143 Italy
AU: Consolini, G
EM: consolini@ifsi.rm.cnr.it
AF: Ist. Fisica Spazio Interplanetario, INAF, Via Fosso del Cavaliere, 100, Roma, Ita I-00133 Italy
AB: The Auroral Electrojet (AE) index, introduced to track the global high-latitude geomagnetic activity mainly during magnetospheric substorms, has been widely studied as a global descriptor of the nonlinear and complex dynamics of the magnetosphere in response to solar-wind changes. However, it is nowadays well known that AE-index is mainly representative of two different processes: i) the enhancement of convection directly driven by solar-wind; ii) the magnetotail impulsive unloading (Rostoker et al., 1987; Kamide & Kokubun, 1996). Here, we approach to the two different processes by using some wavelet based techniques: the Local Intemittency Measure (LIM) analysis, and the Local Wavelet Bicoherence. By means of this two wavelet techniques, we will shown how the impulsive unloading component has a coherent intermittent character.
DE: 2409 Current systems (2721)
DE: 2721 Field-aligned currents and current systems (2409)
DE: 2736 Magnetosphere/ionosphere interactions (2431)
DE: 2790 Substorms
DE: 3280 Wavelet transform (3255, 4455)
SC: Geomagnetism and Paleomagnetism [GP]
MN: Fall Meeting 2005