Characterizing Solar Surface Turbulence

Details Characterizing Solar Surface Turbulence Characterizing Solar Surface Turbulence

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.3711s&link_type=abstract

American Astronomical Society Meeting 204, #37.11; Bulletin of the American Astronomical Society, Vol. 36, p.710

Astronomy and Astrophysics

Astronomy

Scientific paper

The identification and characterization of solar surface turbulence is particularly important for understanding the dynamics associated with eruptive phenomena. In this paper, we present a wavelet analysis for characterizing surface turbulence associated with solar eruptions. By definition, solar eruptions represent impulsive events rather than a statistical steady state and the analysis of impulsive events requires both time and frequency localization for proper robust characterization. Thus, the wavelet (time-frequency) basis represents integral ingredient for the analysis.
In this paper, H-α turbulence on the solar disk is characterized by estimating the local-frequency-wavenumber distribution (local dispersion relation) of the fluctuations. The local frequency wavenumber distribution is computed by generalizing established two-point multi-scale wavelet interferometric techniques [1-3] for the multipoint data represented by solar images. The local-wavenumber-distribution produces robust estimates for the phase velocities of fluctuations in the sequence of solar images.
[1] J. L. Pinçon, P. M. Kintner, P. W. Schuck and C. E. Seyler, Observation and analysis of lower hybrid solitary structures as rotating eigenmodes, \textit{J. Geophys. Res.}, \textbf{102}, 17283\--17296, 1997.
[2] P. W. Schuck, C. E. Seyler, J. L. Pinçon, John Bonnell, and P. M. Kintner, Theory, simulation and observation of discrete eigenmodes associated with lower hybrid solitary structures, \textit{J. Geophys. Res.}, \textbf{103}, 6935\--6953, 1998.
[3] J. W. Bonnell, P. W. Schuck, J.\--L. Pinçon, C. E. Seyler, and P. M. Kintner, Observation of bound states and counter\--rotating lower hybrid eigenmodes in the auroral ionosphere, \textit{Phys. Rev. Lett.}, \textbf{80}, 5734\--5737, 1998.
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