Quasi full-disk maps of solar horizontal velocities using SDO/HMI data

Th Roudier, M. Rieutord, J. M. Malherbe, N. Renon, T. Berger, Z. Frank, V. Prat, Laurent Gizon, M. Švanda

Research output: Contribution to journalArticle

Abstract

Aims. For the first time, the motion of granules (solar plasma on the surface on scales larger than 2.5 Mm) has been followed over the entire visible surface of the Sun, using SDO/HMI white-light data. Methods. Horizontal velocity fields are derived from image correlation tracking using a new version of the coherent structure tracking algorithm. The spatial and temporal resolutions of the horizontal velocity map are 2.5 Mm and 30 min, respectively. Results. From this reconstruction, using the multi-resolution analysis, one can obtain to the velocity field at different scales with its derivatives such as the horizontal divergence or the vertical component of the vorticity. The intrinsic error on the velocity is ∼0.25 km s -1 for a time sequence of 30 min and a mesh size of 2.5 Mm. This is acceptable compared to the granule velocities, which range between 0.3 km s -1 and 1.8 km s -1. A high correlation between velocities computed from Hinode and SDO/HMI has been found (85%). From the data we derive the power spectrum of the supergranulation horizontal velocity field, the solar differential rotation, and the meridional velocity.

Original languageEnglish (US)
Article numberA88
JournalAstronomy and Astrophysics
Volume540
DOIs
StatePublished - Apr 5 2012

Fingerprint

velocity distribution
temporal resolution
vorticity
solar wind
power spectra
mesh
divergence
sun
spatial resolution
mesh size
plasma

Keywords

  • Sun: general
  • Sun: granulation
  • Sun: rotation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Roudier, T., Rieutord, M., Malherbe, J. M., Renon, N., Berger, T., Frank, Z., ... Švanda, M. (2012). Quasi full-disk maps of solar horizontal velocities using SDO/HMI data. Astronomy and Astrophysics, 540, [A88]. https://doi.org/10.1051/0004-6361/201118678

Quasi full-disk maps of solar horizontal velocities using SDO/HMI data. / Roudier, Th; Rieutord, M.; Malherbe, J. M.; Renon, N.; Berger, T.; Frank, Z.; Prat, V.; Gizon, Laurent; Švanda, M.

In: Astronomy and Astrophysics, Vol. 540, A88, 05.04.2012.

Research output: Contribution to journalArticle

Roudier, T, Rieutord, M, Malherbe, JM, Renon, N, Berger, T, Frank, Z, Prat, V, Gizon, L & Švanda, M 2012, 'Quasi full-disk maps of solar horizontal velocities using SDO/HMI data', Astronomy and Astrophysics, vol. 540, A88. https://doi.org/10.1051/0004-6361/201118678
Roudier T, Rieutord M, Malherbe JM, Renon N, Berger T, Frank Z et al. Quasi full-disk maps of solar horizontal velocities using SDO/HMI data. Astronomy and Astrophysics. 2012 Apr 5;540. A88. https://doi.org/10.1051/0004-6361/201118678
Roudier, Th ; Rieutord, M. ; Malherbe, J. M. ; Renon, N. ; Berger, T. ; Frank, Z. ; Prat, V. ; Gizon, Laurent ; Švanda, M. / Quasi full-disk maps of solar horizontal velocities using SDO/HMI data. In: Astronomy and Astrophysics. 2012 ; Vol. 540.
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