Proper orthogonal decomposition of solar photospheric motions.
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-frequency oscillations, with frequencies in the range 20-130 microHz, dominate the most energetic POD modes (excluding solar rotation), and are characterized by spatial patterns with typical scales of about 3 Mm. Patterns with larger typical scales of approximately 10 Mm, are associated to p-modes oscillations at frequencies of about 3000 microHz.
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Dipartimento di Fisica, Università della Calabria, and Istituto Nazionale di Fisica della Materia, Unità di Cosenza, 87030 Rende (CS), Italy.
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Lepreti
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Veltri
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Alfonsi
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Straus
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