Results 61 to 70 of about 242,574 (198)

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

Rotation, activity, and stellar obliquities in a large uniform sample of Kepler solar analogs

Journal of Space Weather and Space Climate, 2016
In this study, we undertook a deep photometric examination of a narrowly-defined sample of solar analogs in the Kepler field, with the goals of producing a uniform and statistically meaningful sample of such stars, comparing the properties of planet ...
Buzasi Derek, Lezcano Andy, Preston Heather L.   +2 more
doaj   +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

Characteristics of the Solar Differential Rotation and Activity During Solar Cycle No. 24

Universe
An analysis of the solar differential rotation (DR) during solar cycle No. 24 (SC24) (2009–2019), based on the Kanzelhöhe Observatory for Solar and Environmental Research (KSO) data set, is presented.
Ivana Poljančić Beljan, Luka Šibenik, Klaudija Lončarić, Tomislav Jurkić, Rajka Jurdana-Šepić, Werner Pötzi, Damir Hržina, Roman Brajša, Astrid M. Veronig, Arnold Hanslmeier   +9 more
doaj   +1 more source

Faraday rotation maps of disk galaxies

, 2018
Faraday rotation is one of the most widely used observables to infer the strength and configuration of the magnetic field in the ionised gas of the Milky Way and nearby spiral galaxies.
Gomez, Facundo A., Grand, Robert J. J., Guillet, Thomas, Marinacci, Federico, Pakmor, Ruediger, Pfrommer, Christoph, Simpson, Christine M., Springel, Volker   +7 more
core   +1 more source

Rotation curve of the Milky Way

EPJ Web of Conferences, 2012
We use SEGUE and Hipparcos data to restrict the behaviour of the rotation curve of the Milky Way in the solar neighbourhood. Then we construct a density model of the Milky Way which best reproduces the available observations of the rotation curve and is ...
Lee Y.S., Beers T.C., Just A., Golubov O.   +3 more
doaj   +1 more source

Solar Irradiance Observed from PVO and Inferred Solar Rotation [PDF]

, 1990
Solar irradiance in the extreme ultraviolet flux (EUV) has been monitored for 11 years by the Pioneer Venus Orbiter (PVO). Since the experiment moves around the Sun with the orbital rate of Venus rather than that of Earth, the measurement gives us a ...
Hoegy, Walter R., Wolff, Charles L.
core   +1 more source

Determination of rotation periods in solar-like stars with irregular sampling: the Gaia case

, 2012
We present a study on the determination of rotation periods (P) of solar-like stars from the photometric irregular time-sampling of the ESA Gaia mission, currently scheduled for launch in 2013, taking into account its dependence on ecliptic coordinates ...
A. C. Lanzafame, A. F. Lanza, A. J. Korn, Anklin, Baliunas, Balthasar, Bonomo, Deeming, Dias, Donahue, Donahue, Donahue, Dworetsky, E. Distefano, Eyer, Eyer, Fligge, Frescura, Fröhlich, Fröhlich, Fröhlich, Gustafsson, Hodgkin, Holl, Horne, Irwin, J. Cuypers, Jordi, Jurkevich, K. Eriksson, Lanza, Lanza, Lanza, Lanza, Lanza, Lomb, Messina, Messina, Messina, Messina, Messina, Messina, Messina, Messina, Messina, Mignard, Perryman, Radick, S. Messina, Scargle, Schwarzenberg-Czerny, Stellingwerf   +51 more
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Exploring the Dynamic Rotational Profile of the Hotter Solar Atmosphere: A Multiwavelength Approach Using SDO/AIA Data

The Astrophysical Journal
Understanding the global rotational profile of the solar atmosphere and its variation is fundamental to uncovering a comprehensive understanding of the dynamics of the solar magnetic field and the extent of coupling between different layers of the Sun ...
Srinjana Routh, Bibhuti Kumar Jha, Dibya Kirti Mishra, Tom Van Doorsselaere, Vaibhav Pant, Subhamoy Chatterjee, Dipankar Banerjee   +6 more
doaj   +1 more source

The Origin of Enhanced Activity in the Suns of M67

, 2009
We report the results of the analysis of high resolution photospheric line spectra obtained with the UVES instrument on the VLT for a sample of 15 solar-type stars selected from a recent survey of the distribution of H and K chromospheric line strengths ...
A. Reiners, Allain, Barnes, Bouvier, Giampapa, Gray, Kurucz, Lockwood, M. S. Giampapa, Radick   +9 more
core   +1 more source