Results 21 to 30 of about 3,457 (163)

2D dynamics of the radiative core of low mass stars

EPJ Web of Conferences, 2017
Understanding the internal rotation of low mass stars all along their evolution is of primary interest when studying their rotational dynamics, internal mixing and magnetic field generation.
Hypolite Delphine, Mathis Stéphane, Rieutord Michel   +2 more
doaj   +1 more source

On Differential Rotation and Overshooting in Solar-like Stars [PDF]

The Astrophysical Journal, 2017
Abstract We seek to characterize how the change of global rotation rate influences the overall dynamics and large-scale flows arising in the convective envelopes of stars covering stellar spectral types from early G to late K. We do so through numerical simulations with the ASH code, where we consider stellar convective envelopes coupled
Allan Sacha Brun, Antoine Strugarek, Jacobo Varela, Sean P. Matt, Kyle C. Augustson, Constance Emeriau, Olivier Long DoCao, Benjamin Brown, Juri Toomre   +8 more
openaire   +3 more sources

Solar Oblateness and Differentially Rotating Polytropes [PDF]

International Astronomical Union Colloquium, 1970
Dicke and Goldenberg (1967a) measured the solar oblateness to be σ= (5±0.7) × 10-5 and subsequently interpreted this measurement as evidence that the solar interior rotates with a period of 1.d8. With this interpretation, they then showed that the observed oblateness causes an 8% discrepancy in the Einstein prediction of the perihelion advance of ...
G. G. Fahlman, M. D. T. Naylor, S. P. S. Anand   +2 more
openaire   +1 more source

Differential Rotation in the Solar Interior [PDF]

International Astronomical Union Colloquium, 1970
One of the big problems in stellar rotation which has been the object of much debate recently concerns the magnitude of the angular velocity in the central regions of the sun. It is a good example of our general ignorance of the distribution of angular momentum in the interiors of stars. There is good reason, of course, for this ignorance.
openaire   +1 more source

Differential Rotation and Dynamics of the Solar Interior [PDF]

Science, 1996
Splitting of the sun's global oscillation frequencies by large-scale flows can be used to investigate how rotation varies with radius and latitude within the solar interior. The nearly uninterrupted observations by the Global Oscillation Network Group (GONG) yield oscillation power spectra with high duty cycles and high signal-to-noise ratios ...
Thompson, M., Toomre, J., Anderson, E., Antia, H., Berthomieu, G., Burtonclay, D., Chitre, S., Christensen-Dalsgaard, J., Corbard, T., Derosa, M., Genovese, C., Gough, D., Haber, D., Harvey, J., Hill, F., Howe, R., Korzennik, S., Kosovichev, A., Leibacher, J., Pijpers, F., Provost, J., Rhodes, E., Schou, J., Sekii, T., Stark, P., Wilson, P.   +25 more
openaire   +4 more sources

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

Rotating Turbulent Thermal Convection and Solar Differential Rotation

, 2022
The expansion of the rotating fluid will change the vorticity and rotational speed of the expanding region. In turbulent thermal convection, this microscopic effect is preserved. Tracking the fluid micelles shows that the average vorticity varies with density, producing vorticity transport and angular momentum transport from the low-density area to the
Chen, Haibin, Wu, Rong
openaire   +2 more sources

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

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

Solar Rotation and Activity for Cycle 24 from SDO/AIA Observations

The Astrophysical Journal
Differential rotation plays a crucial role in the dynamics of the Sun. We study the solar rotation and its correlation with solar activity by applying a modified machine learning algorithm to identify and track coronal bright points (CBPs) from the Solar
Zahra Shokri, Nasibe Alipour, Hossein Safari   +2 more
doaj   +1 more source