Large-scale photospheric motions determined from granule tracking and helioseismology from SDO/HMI data

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10385951" target="_blank" >RIV/00216208:11320/18:10385951 - isvavai.cz</a>

Alternative codes found

RIV/67985815:_____/18:00495455

Result on the web

<a href="https://doi.org/10.1051/0004-6361/201732014" target="_blank" >https://doi.org/10.1051/0004-6361/201732014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201732014" target="_blank" >10.1051/0004-6361/201732014</a>

Result language

angličtina

Original language name

Large-scale photospheric motions determined from granule tracking and helioseismology from SDO/HMI data

Original language description

Context. Large-scale flows in the Sun play an important role in the dynamo process linked to the solar cycle. The important large-scale flows are the differential rotation and the meridional circulation with an amplitude of km s 1 and few m s 1, respectively. These flows also have a cycle-related components, namely the torsional oscillations. Aims. Our attempt is to determine large-scale plasma flows on the solar surface by deriving horizontal flow velocities using the techniques of solar granule tracking, dopplergrams, and time-distance helioseismology. Methods. Coherent structure tracking (CST) and time-distance helioseismology were used to investigate the solar differential rotation and meridional circulation at the solar surface on a 30-day HMI/SDO sequence. The influence of a large sunspot on these large-scale flows with a specific 7-day HMI/SDO sequence has been also studied. Results. The large-scale flows measured by the CST on the solar surface and the same flow determined from the same data with the helioseismology in the first 1 Mm below the surface are in good agreement in amplitude and direction. The torsional waves are also located at the same latitudes with amplitude of the same order. We are able to measure the meridional circulation correctly using the CST method with only 3 days of data and after averaging between +/-15 degrees in longitude. Conclusions. We conclude that the combination of CST and Doppler velocities allows us to detect properly the differential solar rotation and also smaller amplitude flows such as the meridional circulation and torsional waves. The results of our methods are in good agreement with helioseismic measurements.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy &amp; Astrophysics [online]

ISSN

1432-0746

e-ISSN

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Volume of the periodical

611

Issue of the periodical within the volume

Neuveden

Country of publishing house

FR - FRANCE

Number of pages

9

Pages from-to

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UT code for WoS article

000429194700001

EID of the result in the Scopus database

2-s2.0-85045214294