**AAS 204th Meeting, June 2004**

*Session 37 Solar Magnetic Fields and the Photosphere*

SPD Poster, Tuesday, June 1, 2004, 10:00am-7:00pm, Ballroom
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## [37.11] Characterizing Solar Surface Turbulence

*P. Schuck, J. Chen, I. Schwartz (United States Naval Research Laboratory), V. Yurchyshyn (Big Bear Solar Observatory)*

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-\alpha 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.\\

Work Supported by ONR

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