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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…

Surprising Sun: A New Step Towards a Complete Picture?

García, R. A.; Turck-Chièze, S.; Piau, L. +5 more

Important revisions of the solar model ingredients have appeared recently. We first show that the updated CNO composition suppresses the anomalous position of the Sun in the known galactic enrichment. The following law, He/H=0.075+44.6 O/H in number fraction, is now compatible with all the indicators. We then suggest some directions of investigati…