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POD analysis of photospheric velocity field: Solar oscillations and granulation

Abstract:

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 μHz, 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 μHz.

Año de publicación:

2005

Keywords:

    Fuente:

    scopusscopus

    Tipo de documento:

    Conference Object

    Estado:

    Acceso restringido

    Áreas de conocimiento:

    • Viento solar
    • Energía solar

    Áreas temáticas:

    • Física moderna
    • Cuerpos y fenómenos celestes específicos
    • Geología, hidrología, meteorología

    Contribuidores:

    Vecchio A.Vecchio A.
    Lepreti F.Lepreti F.
    Luca Sorriso-ValvoLuca Sorriso-Valvo
    Veltri P.Veltri P.
    Straus T.Straus T.
    Carbone V.Carbone V.