Results 51 to 60 of about 2,991,320 (323)

Surface differential rotation and photospheric magnetic field of the young solar-type star HD 171488 (V889 Her) [PDF]

, 2006
We present spectropolarimetric observations of the young, single early G-dwarf HD 171488. These observations were obtained over a five-night period in 2004 September at the 3.9-m Anglo-Australian Telescope using the SEMPOL spectropolarimeter visitor ...
Donati, J-F., Carter, B.D., Semel, M., Donati, J.-F., Petit, P., Marsden, S. C., Marsden, S.C., Carter, B. D.   +7 more
core   +1 more source

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

Activity and differential rotation of the early M dwarf Kepler-45 from transit mapping [PDF]

, 2020
Little is known of the activity and differential rotation of low luminosity, early M dwarfs from direct observation. We present the first stellar activity analysis of star-spots and faculae for the hot Jupiter hosting M1V dwarf Kepler-45 from Kepler ...
Zaleski, S. M., Valio, A., Marsden, S. C., Carter, B. D.   +3 more
core   +1 more source

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 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

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

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

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

Magnetohydrodynamic control of differential rotation and dynamo transitions: Rise of the local magnetic Rossby number [PDF]

Monthly notices of the Royal Astronomical Society
We investigate how the strength of the Lorentz force alters stellar convection zone dynamics in a suite of buoyancy-dominated, three-dimensional, spherical shell convective dynamo models. This is done by varying only the fluid’s electrical conductivity
K. Soderlund, P. Wulff, P. Käpylä, J. Aurnou   +3 more
semanticscholar   +1 more source