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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F13%3A10174146%21RIV14-MSM-11320___
rdf:type
n14:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1051/0004-6361/201220867
dcterms:description
Context. The measurement of the Sun's surface motions with a high spatial and temporal resolution is still a challenge. Aims. We wish to validate horizontal velocity measurements all over the visible disk of the Sun from Solar Dynamics Observatory/Helioseismic and Magnetic Imager (SDO/HMI) data. Methods. Horizontal velocity fields are measured by following the proper motions of solar granules using a newly developed version of the coherent structure tracking (CST) code. The comparison of the surface flows measured at high spatial resolution (Hinode, 0.1 arcsec) and low resolution (SDO/HMI, 0.5 arcsec) allows us to determine corrections to be applied to the horizontal velocity measured from HMI white light data. Results. We derive horizontal velocity maps with spatial and temporal resolutions of respectively 2.5 Mm and 30 min. From the two components of the horizontal velocity v(x) and v(y) measured in the sky plane and the simultaneous line of sight component from SDO/HMI dopplergrams v(D), we derive the spherical velocity components (v(r), v(theta), v(phi)). The azimuthal component v(phi) gives the solar differential rotation with a high precision (+/- 0.037 km s(-1)) from a temporal sequence of only three hours. Conclusions. By following the proper motions of the solar granules, we can revisit the dynamics of the solar surface at high spatial and temporal resolutions from hours to months and years with the SDO data. Context. The measurement of the Sun's surface motions with a high spatial and temporal resolution is still a challenge. Aims. We wish to validate horizontal velocity measurements all over the visible disk of the Sun from Solar Dynamics Observatory/Helioseismic and Magnetic Imager (SDO/HMI) data. Methods. Horizontal velocity fields are measured by following the proper motions of solar granules using a newly developed version of the coherent structure tracking (CST) code. The comparison of the surface flows measured at high spatial resolution (Hinode, 0.1 arcsec) and low resolution (SDO/HMI, 0.5 arcsec) allows us to determine corrections to be applied to the horizontal velocity measured from HMI white light data. Results. We derive horizontal velocity maps with spatial and temporal resolutions of respectively 2.5 Mm and 30 min. From the two components of the horizontal velocity v(x) and v(y) measured in the sky plane and the simultaneous line of sight component from SDO/HMI dopplergrams v(D), we derive the spherical velocity components (v(r), v(theta), v(phi)). The azimuthal component v(phi) gives the solar differential rotation with a high precision (+/- 0.037 km s(-1)) from a temporal sequence of only three hours. Conclusions. By following the proper motions of the solar granules, we can revisit the dynamics of the solar surface at high spatial and temporal resolutions from hours to months and years with the SDO data.
dcterms:title
Comparison of solar horizontal velocity fields from SDO/HMI and Hinode data Comparison of solar horizontal velocity fields from SDO/HMI and Hinode data
skos:prefLabel
Comparison of solar horizontal velocity fields from SDO/HMI and Hinode data Comparison of solar horizontal velocity fields from SDO/HMI and Hinode data
skos:notation
RIV/00216208:11320/13:10174146!RIV14-MSM-11320___
n14:predkladatel
n17:orjk%3A11320
n3:aktivita
n10:P n10:I
n3:aktivity
I, P(GPP209/12/P568)
n3:cisloPeriodika
duben
n3:dodaniDat
n18:2014
n3:domaciTvurceVysledku
n6:8215022
n3:druhVysledku
n12:J
n3:duvernostUdaju
n4:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
66316
n3:idVysledku
RIV/00216208:11320/13:10174146
n3:jazykVysledku
n16:eng
n3:klicovaSlova
Sun: granulation; Sun: atmosphere
n3:klicoveSlovo
n20:Sun%3A%20atmosphere n20:Sun%3A%20granulation
n3:kodStatuVydavatele
FR - Francouzská republika
n3:kontrolniKodProRIV
[4182E641FE23]
n3:nazevZdroje
Astronomy and Astrophysics
n3:obor
n21:BN
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
10
n3:projekt
n11:GPP209%2F12%2FP568
n3:rokUplatneniVysledku
n18:2013
n3:svazekPeriodika
552
n3:tvurceVysledku
Roudier, Th. Frank, Z. Malherbe, J. M. Rieutord, M. Renon, N. Berger, T. Gizon, L. Burston, R. Prat, V. Švanda, Michal
n3:wos
000317912000112
s:issn
0004-6361
s:numberOfPages
7
n19:doi
10.1051/0004-6361/201220867
n13:organizacniJednotka
11320