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Weak Compressible Magnetohydrodynamic Turbulence in the Solar Corona

Chandran, Benjamin D. G.

This Letter presents a calculation of the power spectra of weakly turbulent Alfvén waves and fast magnetosonic waves (“fast waves”) in low-β plasmas. It is shown that three-wave interactions transfer energy to high-frequency fast waves and, to a lesser extent, high-frequency Alfvén waves. High-frequency waves produced by MHD turbulence are a promi…

Proper Orthogonal Decomposition of Solar Photospheric Motions

Vecchio, A.; Carbone, V.; Veltri, P. +5 more

The spatiotemporal dynamics of the solar photosphere is studied by performing a proper orthogonal decomposition (POD) of line of sight velocity fields computed from high resolution data coming from the MDI/SOHO instrument. Using this technique, we are able to identify and characterize the different dynamical regimes acting in the system. Low-frequ…