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Properties of the solar velocity field indicated by motions of coronal bright points


Vršnak, Bojan; Brajša, Roman; Wöhl, H.; Ruždjak, Vladimir; Clette, F.; Hochedez, J.-F.
Properties of the solar velocity field indicated by motions of coronal bright points // Astronomy and Astrophysics, 404 (2003), 3; 1117-1127 (međunarodna recenzija, članak, znanstveni)


Naslov
Properties of the solar velocity field indicated by motions of coronal bright points

Autori
Vršnak, Bojan ; Brajša, Roman ; Wöhl, H. ; Ruždjak, Vladimir ; Clette, F. ; Hochedez, J.-F.

Izvornik
Astronomy and Astrophysics (0004-6361) 404 (2003), 3; 1117-1127

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Sun rotation; Sun UV radiation; Sun corona

Sažetak
Full-disc solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) are used to analyse properties of the solar velocity field by tracing coronal bright points from June 4, 1998 to May 22, 1999. Rotation velocity residuals, meridional motions and their relationship are investigated. Zones of slow and fast rotation found in motions of coronal bright points are consistent with the pattern of torsional oscillations, indicating that the statistical velocity pattern of bright point motions reflects the large-scale plasma flows. A complex pattern of meridional motion is deduced: The equatorward flows are found to dominate at low (B<10&DEG ; ) and high (B>40degrees) latitudes, whereas at mid-latitudes (Bapproximate to10degrees-40degrees) a poleward flow is inferred. The complete data set shows no significant correlation between rotation residuals and meridional motions. However, when a subsample of coronal bright points including only the "point-like structures" (predominantly young bright points) is considered, a statistically significant correlation is found. On average, faster tracers show equatorward motion and the slower ones show poleward motion. Such a segregation is reflected in a statistically significant covariance of the rotation residuals and meridional velocities in the order of -1000 m(2) s(-2), revealing an equatorward transport of angular momentum. The negative value of the covariance is provided by the high velocity tail in the velocity distribution of point-like structures, representing less than 15% of the population. The latitude dependence of the covariance can be expressed as Q=-62 B + 200 m(2) s(-2) covering the range B=0degrees-60degrees.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
0007016
0007017

Ustanove
Geodetski fakultet, Zagreb

Profili:

Avatar Url Roman Brajša (autor)

Avatar Url Vladimir Ruždjak (autor)

Avatar Url Bojan Vršnak (autor)

Citiraj ovu publikaciju

Vršnak, Bojan; Brajša, Roman; Wöhl, H.; Ruždjak, Vladimir; Clette, F.; Hochedez, J.-F.
Properties of the solar velocity field indicated by motions of coronal bright points // Astronomy and Astrophysics, 404 (2003), 3; 1117-1127 (međunarodna recenzija, članak, znanstveni)
Vršnak, B., Brajša, R., Wöhl, H., Ruždjak, V., Clette, F. & Hochedez, J. (2003) Properties of the solar velocity field indicated by motions of coronal bright points. Astronomy and Astrophysics, 404 (3), 1117-1127.
@article{article, year = {2003}, pages = {1117-1127}, keywords = {Sun rotation, Sun UV radiation, Sun corona}, journal = {Astronomy and Astrophysics}, volume = {404}, number = {3}, issn = {0004-6361}, title = {Properties of the solar velocity field indicated by motions of coronal bright points}, keyword = {Sun rotation, Sun UV radiation, Sun corona} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • The INSPEC Science Abstracts series
  • ADS
  • CDS
  • Compendex
  • INIST
  • PaperChem
  • Physics Abstracts
  • Zentralblatt MATH