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Statistical weights and selective height corrections in the determination of the solar rotation velocity


Brajša, Roman; Ruždjak, Vladimir; Vršnak, Bojan; Woehl, Hubertus; Pohjolainen, Silja; Urpo, Seppo
Statistical weights and selective height corrections in the determination of the solar rotation velocity // Solar Physics, 196 (2000), 2; 279-297 (međunarodna recenzija, članak, znanstveni)


Naslov
Statistical weights and selective height corrections in the determination of the solar rotation velocity

Autori
Brajša, Roman ; Ruždjak, Vladimir ; Vršnak, Bojan ; Woehl, Hubertus ; Pohjolainen, Silja ; Urpo, Seppo

Izvornik
Solar Physics (0038-0938) 196 (2000), 2; 279-297

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

Sažetak
Observations of the Sun performed at 37 GHz with the 14 m radio telescope of the Mets\"ahovi Radio Observatory were analysed. Rotation velocities were determined tracing Low Temperature Regions (LTRs) in the years 1979-1980, 1981-1982, 1987-1988, and 1989-1991. Statistical weights were ascribed to the determined rotation velocities of LTRs according to the number of tracing days. Measured changes of the rotation velocity during the solar activity cycle as well as a north-south rotation asymmetry are discussed. The results obtained with and without the statistical weights procedure are compared, and it was found that the statistical significance of the solar differential rotation parameters' changes is higher when the statistical weights procedure is applied. A selective application of the height correction on LTR's positions has not removed the cycle-related changes nor the north-south asymmetry of the solar rotation measured tracing LTRs. So, projection effects cannot explain these changes. The differential rotation of LTRs is more rigid than the differential rotation obtained tracing magnetic features and measuring Doppler shifts, which can be explained by the association rate of the LTRs' positions with rigidly rotating "pivot points". The observed cycle-related changes and the north-south asymmetry of the rotation velocity of LTRs are consistent with the cycle-related changes and the north-south asymmetry of the association rate between LTRs and pivot points.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
007004

Ustanove
Geodetski fakultet, Zagreb

Profili:

Avatar Url Roman Brajša (autor)

Avatar Url Vladimir Ruždjak (autor)

Avatar Url Bojan Vršnak (autor)

Citiraj ovu publikaciju

Brajša, Roman; Ruždjak, Vladimir; Vršnak, Bojan; Woehl, Hubertus; Pohjolainen, Silja; Urpo, Seppo
Statistical weights and selective height corrections in the determination of the solar rotation velocity // Solar Physics, 196 (2000), 2; 279-297 (međunarodna recenzija, članak, znanstveni)
Brajša, R., Ruždjak, V., Vršnak, B., Woehl, H., Pohjolainen, S. & Urpo, S. (2000) Statistical weights and selective height corrections in the determination of the solar rotation velocity. Solar Physics, 196 (2), 279-297.
@article{article, year = {2000}, pages = {279-297}, keywords = {}, journal = {Solar Physics}, volume = {196}, number = {2}, issn = {0038-0938}, title = {Statistical weights and selective height corrections in the determination of the solar rotation velocity}, keyword = {} }

Časopis indeksira:


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


Uključenost u ostale bibliografske baze podataka:


  • Astronomy and Astrophysics Abstracts