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On the solar rotation and activity


Brajša, Roman; Wohl, H.; Ruždjak, Domagoj; Vršnak, Bojan; Verbanac, Giuliana; Svalgaard, L.; Hochedez, J.-F.
On the solar rotation and activity // Astronomische Nachrichten, 328 (2007), 10; 1013-1015 doi:10.1002/asna.200710867 (međunarodna recenzija, članak, znanstveni)


Naslov
On the solar rotation and activity

Autori
Brajša, Roman ; Wohl, H. ; Ruždjak, Domagoj ; Vršnak, Bojan ; Verbanac, Giuliana ; Svalgaard, L. ; Hochedez, J.-F.

Izvornik
Astronomische Nachrichten (0004-6337) 328 (2007), 10; 1013-1015

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

Ključne riječi
Sun: activity ­ Sun: rotation

Sažetak
The interaction between differential rotation and magnetic fields in the solar convection zone was recently modelled by Brun (2004). One consequence of that model is that the Maxwell stresses can oppose the Reynolds stresses, and thus contribute to the transport of the angular momentum towards the solar poles, leading to a reduced differential rotation. So, when magnetic fields are weaker, a more pronounced differential rotation can be expected, yielding a higher rotation velocity at low latitudes taken on the average. This hypothesis is consistent with the behaviour of the solar rotation during the Maunder minimum. In this work we search for similar signatures of the relationship between the solar activity and rotation determined tracing sunspot groups and coronal bright points. We use the extended Greenwich data set (1878­ 1981) and a series of full-disc solar images taken at 28.4 nm with the EIT instrument on the SOHO spacecraft (1998­ 2000). We investigate the dependence of the solar rotation on the solar activity (described by the relative sunspot number) and the interplanetary magnetic field (calculated from the interdiurnal variability index). Possible rotational signatures of two weak solar activity cycles at the beginning of the 20th century (Gleissberg minimum) are discussed.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
007-0000000-1362 - Eruptivni procesi u Sunčevoj atmosferi (Bojan Vršnak, )
007-0000000-1364 - Fizikalni procesi u atmosferama Sunca i zvijezda (Vladimir Ruždjak, )
119-1193086-1314 - Istraživanje geomagnetskog polja i nehomogenosti litosfere u području Hrvatske (Davorka Herak, )

Ustanove
Geodetski fakultet, Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

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:


  • NASA-ADS


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