Proper orthogonal decomposition of solar photospheric motions

Details Proper orthogonal decomposition of solar photospheric motions Proper orthogonal decomposition of solar photospheric motions

2005-06-27

arxiv.org/abs/astro-ph/0506641v1

Phys.Rev.Lett.95:061102,2005

Astronomy and Astrophysics

Astrophysics

8 figures in jpg in press on PRL

Scientific paper

10.1103/PhysRevLett.95.061102

The spatio-temporal 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 10 Mm, are associated to p-modes oscillations at frequencies of about 3000 microHz.

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