HR: 1340h
AN: SM43A-1213    [Abstracts]
TI: Intermittent and Multifractal Nature of the Electric Field Fluctuations in the Auroral Zone
AU: * Tam, S W
EM: wyt@space.mit.edu
AF: Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 United States
AU: Chang, T
EM: tsc@space.mit.edu
AF: Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 United States
AU: Kintner, P M
EM: pmk1@cornell.edu
AF: Cornell University, School of Electrical and Computer Engineering, Ithaca, NY 14853 United States
AU: Klatt, E
EM: ek59@cornell.edu
AF: Cornell University, School of Electrical and Computer Engineering, Ithaca, NY 14853 United States
AB: We perform a number of analyses on the electric field data obtained by the SIERRA sounding rocket in the auroral zone. The electric field fluctuations are broadband, covering the extremely low-frequency range with a power-law relation, similar to the type of fluctuations commonly observed at various altitudes of the auroral region. Our analyses of the data based on the technique of probability distribution functions, wavelet analyses and local intermittency measures indicate that the electric field fluctuations are intermittent, with the degree of intermittency higher for fluctuations at smaller scales. Calculations of structure functions and partition functions for the data with various exponents show that properties of these functions are related to the exponent by multiple power laws, thus revealing the multifractal nature of the electric field fluctuations.
DE: 2407 Auroral ionosphere (2704)
DE: 2411 Electric fields (2712)
DE: 3280 Wavelet transform (3255, 4455)
DE: 4440 Fractals and multifractals
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005