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Persistent Near-Surface Flow Structures from Local Helioseismology

Howe, R; Komm, RW; Baker, D; Harra, L; van Driel-Gesztelyi, L; Bogart, RS; (2015) Persistent Near-Surface Flow Structures from Local Helioseismology. Solar Physics , 290 (11) pp. 3137-3149. 10.1007/s11207-015-0747-3. Green open access

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Abstract

Near-surface flows measured by the ring-diagram technique of local helioseismology show structures that persist over multiple rotations. We examine these phenomena using data from the Global Oscillation Network Group (GONG) and the Helioseismic and Magnetic Imager (HMI) and show that a correlation analysis of the structures can be used to estimate the rotation rate as a function of latitude, giving a result consistent with the near-surface rate from global helioseismology and slightly slower than that obtained from a similar analysis of the surface magnetic field strength. At latitudes of 60∘60∘ and above, the HMI flow data reveal a strong signature of a two-sided zonal flow structure. This signature may be related to recent reports of “giant cells” in solar convection.

Type: Article
Title: Persistent Near-Surface Flow Structures from Local Helioseismology
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s11207-015-0747-3
Publisher version: http://doi.org/10.1007/s11207-015-0747-3
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Active regions, velocity field Helioseismology, observations Velocity fields, photosphere, Probing the Sun: Inside and Out
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1499048
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