The spatiotemporal dynamics of the solar photosphere is studied by performing a proper orthogonaldecomposition (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 range20–130 micro-Hz, dominate the most energetic POD modes (excluding solar rotation), and are characterizedby spatial patterns with typical scales of about 3 Mm. Patterns with larger typical scales of ~ 10 Mm, areassociated to p-modes oscillations at frequencies of about 3000 micro-Hz.
Proper orthogonal decomposition of solar photospheric motions
CARBONE V.;LEPRETI, Fabio;PRIMAVERA, Leonardo;VELTRI, Pierluigi;ALFONSI, Giancarlo;
2005-01-01
Abstract
The spatiotemporal dynamics of the solar photosphere is studied by performing a proper orthogonaldecomposition (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 range20–130 micro-Hz, dominate the most energetic POD modes (excluding solar rotation), and are characterizedby spatial patterns with typical scales of about 3 Mm. Patterns with larger typical scales of ~ 10 Mm, areassociated to p-modes oscillations at frequencies of about 3000 micro-Hz.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
