title: Proper orthogonal decomposition of solar photospheric motions.
abstract: 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.
authors.affiliation: Dipartimento di Fisica, Università della Calabria, and Istituto Nazionale di Fisica della Materia, Unità di Cosenza, 87030 Rende (CS), Italy.
authors.forename: A
authors.initials: A
authors.lastname: Vecchio
authors.forename: V
authors.initials: V
authors.lastname: Carbone
authors.forename: F
authors.initials: F
authors.lastname: Lepreti
authors.forename: L
authors.initials: L
authors.lastname: Primavera
authors.forename: L
authors.initials: L
authors.lastname: Sorriso-Valvo
authors.forename: P
authors.initials: P
authors.lastname: Veltri
authors.forename: G
authors.initials: G
authors.lastname: Alfonsi
authors.forename: Th
authors.initials: T
authors.lastname: Straus