Structure and evolution of solar supergranulation using SDO/HMI data

Th Roudier, M. Švanda, M. Rieutord, J. M. Malherbe, R. Burston, Laurent Gizon

    Research output: Contribution to journalArticle

    Abstract

    Context. Studying the motions on the solar surface is fundamental for understanding how turbulent convection transports energy and how magnetic fields are distributed across the solar surface. Aims. From horizontal velocity measurements all over the visible disc of the Sun and using data from the Solar Dynamics Observatory/Helioseismic and Magnetic Imager (SDO/HMI), we investigate the structure and evolution of solar supergranulation. Methods. Horizontal velocity fields were measured by following the proper motions of solar granules using a newly developed version of the coherent structure tracking code. With this tool, maps of horizontal divergence were computed. We then segmented and identified supergranular cells and followed their histories by using spatio-temporal labelling. With this data set we derived the fundamental properties of supergranulation, including their motion. Results. We find values of the fundamental parameters of supergranulation similar to previous studies: a mean lifetime of 1.5 days and a mean diameter of 25 Mm. The tracking of individual supergranular cells reveals the solar differential rotation and a poleward circulation trend of the meridional flow. The shape of the derived differential rotation and meridional flow does not depend on the cell size. If there is a background magnetic field, the diverging flows in supergranules are weaker. Conclusions. This study confirms that supergranules are suitable tracers that may be used to investigate the large-scale flows of the solar convection as long as they are detectable enough on the surface.

    Original languageEnglish (US)
    Article numberA138
    JournalAstronomy and Astrophysics
    Volume567
    DOIs
    StatePublished - Jan 1 2014

    Fingerprint

    helioseismology
    meridional flow
    observatories
    observatory
    cells
    convection
    proper motion
    magnetic field
    velocity measurement
    magnetic fields
    marking
    tracers
    divergence
    sun
    velocity distribution
    histories
    trends
    life (durability)
    tracer
    history

    Keywords

    • Sun: general
    • Sun: granulation
    • Sun: photosphere

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Roudier, T., Švanda, M., Rieutord, M., Malherbe, J. M., Burston, R., & Gizon, L. (2014). Structure and evolution of solar supergranulation using SDO/HMI data. Astronomy and Astrophysics, 567, [A138]. https://doi.org/10.1051/0004-6361/201423577

    Structure and evolution of solar supergranulation using SDO/HMI data. / Roudier, Th; Švanda, M.; Rieutord, M.; Malherbe, J. M.; Burston, R.; Gizon, Laurent.

    In: Astronomy and Astrophysics, Vol. 567, A138, 01.01.2014.

    Research output: Contribution to journalArticle

    Roudier, T, Švanda, M, Rieutord, M, Malherbe, JM, Burston, R & Gizon, L 2014, 'Structure and evolution of solar supergranulation using SDO/HMI data', Astronomy and Astrophysics, vol. 567, A138. https://doi.org/10.1051/0004-6361/201423577
    Roudier T, Švanda M, Rieutord M, Malherbe JM, Burston R, Gizon L. Structure and evolution of solar supergranulation using SDO/HMI data. Astronomy and Astrophysics. 2014 Jan 1;567. A138. https://doi.org/10.1051/0004-6361/201423577
    Roudier, Th ; Švanda, M. ; Rieutord, M. ; Malherbe, J. M. ; Burston, R. ; Gizon, Laurent. / Structure and evolution of solar supergranulation using SDO/HMI data. In: Astronomy and Astrophysics. 2014 ; Vol. 567.
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