Results 31 to 40 of about 95,397 (283)

Probing the rotation rate of solar active regions: the comparison of methods

Open Astronomy, 2022
Sunspot groups are often used as tracers to probe the differential rotation of the Sun. However, the results on the rotation rate variation obtained by different authors are not always in agreement. The reason for this might be a number of effects.
Kutsenko Alexander S., Abramenko Valentina I.   +1 more
doaj   +1 more source

Testing the recovery of stellar rotation signals from Kepler light curves using a blind hare-and-hounds exercise [PDF]

, 2015
We present the results of a blind exercise to test the recoverability of stellar rotation and differential rotation in Kepler light curves. The simulated light curves lasted 1000 days and included activity cycles, Sun-like butterfly patterns ...
Aigrain, S., Ceillier, T., Chagas, M. L. das, Davenport, J. R. A., de Medeiros, J. R., Garcia, R. A., Hay, K. L., Lanza, A. F., Llama, J., Mazeh, T., McQuillan, A., Nielsen, M. B., Reinhold, T.   +12 more
core   +3 more sources

Solar differential rotation and meridional flow: The role of a subadiabatic tachocline for the Taylor-Proudman balance [PDF]

, 2005
We present a simple model for the solar differential rotation and meridional circulation based on a mean field parameterization of the Reynolds stresses that drive the differential rotation.
Kitchatinov L. L., Kitchatinov L. L., M. Rempel, Pidatella R. M., Skaley D., Spruit H., Stix M.   +6 more
core   +2 more sources

V889 Her: abrupt changes in the magnetic field or differential rotation?

The Open Journal of Astrophysics, 2022
We have applied Zeeman-Doppler imaging (ZDI) to an extensive spectropolarimetric HARPSpol data set of the magnetically active young solar analogue V889 Her, covering 35 spectra obtained during six nights in May 2011.
Teemu Willamo, Thomas Hackman, Jyri J. Lehtinen, Maarit Korpi-Lagg, Oleg Kochukhov   +4 more
doaj   +1 more source

Detection of differential rotation in psi Cap with profile analysis

, 2001
We report detection of differential rotation on the F5 dwarf psi Cap using line profile analysis. The Fourier transform of both FeI lambda 5775 and SiI lambda 5772 are used to obtain a projected rotational velocity of v sini = (42+-1)km/s.
A. Reiners, Barnes, Baschek, Belvedere, Blackwell, Bruning, Bruning, Donati, Dravins, Gray, Gray, Groot, Hempelmann, J. H. M. M. Schmitt, Kitchatinov, Kupka, Kurucz, Lachaume, M. Kürster, Messina, Townsend   +20 more
core   +2 more sources

Ray Tracing of MHD Rossby Waves in the Solar Tachocline: Meridional Propagation and Implications for the Solar Magnetic Activity

Frontiers in Astronomy and Space Sciences, 2022
Rossby waves have been recently recognised for their role in the large-scale spatio-temporal organisation of the solar magnetic activity. Here, we study the propagation of magnetohydrodynamic Rossby waves in a thin layer, representing the solar ...
André S. W. Teruya, Breno Raphaldini, Carlos F. M. Raupp   +2 more
doaj   +1 more source

Differential Rotation and Magnetism in Simulations of Fully Convective Stars

, 2010
Stars of sufficiently low mass are convective throughout their interiors, and so do not possess an internal boundary layer akin to the solar tachocline.
Gilman, Matthew K. Browning, Morin, Reiners   +3 more
core   +1 more source

The impact of differential rotation on the stochastic excitation of acoustic modes in solar-like pulsators

Astronomy & Astrophysics
Context. Acoustic modes are excited by turbulent convection in the outer convective envelope of solar-like stars. Observational results from asteroseismic studies have shown that 44% of solar-like stars do not present detectable stochastically excited ...
Biscarrat G., Bessila L., Mathis S.
doaj   +1 more source

Solar differential rotation in the period 1964 - 2016 determined by the Kanzelh\"ohe data set

, 2017
The main aim of this work is to determine the solar differential rotation by tracing sunspot groups during the period 1964-2016, using the Kanzelh\"ohe Observatory for Solar and Environmental Research (KSO) sunspot drawings and white light images.
Beljan, I. Poljančić, Brajša, R., Hanslmeier, A., Hržina, D., Jurdana-Šepić, R., Pötzi, W., Ruždjak, D., Skokić, I., Sudar, D., Veronig, A., Wöhl, H.   +10 more
core   +1 more source

A Comparison of Solar Cycle Variations in the Equatorial Rotation Rates of the Sun's Subsurface, Surface, Corona, and Sunspot Groups

, 2013
Using the Solar Optical Observing Network (SOON) sunspot-group data for the period 1985-2010, the variations in the annual mean equatorial-rotation rates of the sunspot groups are determined and compared with the known variations in the solar equatorial ...
A. Brandenburg, A.G. Kosovichev, A.G. Kosovichev, B.B. Karak, D. Ruždjak, D.-Y. Chou, D.O. Gough, F. Meyer, F. Moreno-Insertis, F. Ward, F. Ward, G. Godoli, G.S. Suryanarayana, H. Balthasar, H.M. Antia, H.M. Antia, H.W. Babcock, I. Tuominen, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Javaraiah, J. Tuominen, K. Petrovay, K. Shibata, K.M. Hiremath, K.M. Hiremath, K.R. Sivaraman, L. Driel-Gesztelyi van, M. Dikpati, M. Schüssler, M. Suzuki, M.A. Kambry, N. Meunier, P. Foukal, R. Brajša, R. Howard, R. Howard, R. Howe, R. Jurdana-Šepić, R. Rosner, R.C. Carrington, R.K. Ulrich, R.K. Ulrich, S. Chandra, S. D’Silva, S.S. Gupta   +56 more
core   +1 more source