Results 21 to 30 of about 3,488,609 (297)

Influence of surface stressing on stellar coronae and winds [PDF]

, 2013
STFC funding has supported this research.The large-scale field of the Sun is well represented by its lowest energy (or potential) state. Recent observations, by comparison, reveal that many solar-type stars show large-scale surface magnetic fields that ...
Morin, J., Fares, R., Jardine, Moira, Donati, J. -F., Jardine, M., Morin, Julien, Fares, Rim, Donati, J.-F., Vidotto, A. A., Donati, Jean-François, Gombosi, T. I., van Ballegooijen, A., Gombosi, Tamas I., Jardine, M.; id_orcid   +13 more
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On the topology of global coronal magnetic fields [PDF]

, 2014
This thesis considers the magnetic topology of the global solar corona. To understand the magnetic topology we use the magnetic skeleton which provides us with a robust description of the magnetic field.
Edwards, Sarah J.
core   +2 more sources

The magnetic fields of intermediate-mass T Tauri stars. I. Magnetic detections and fundamental stellar parameters [PDF]

, 2019
International audienceContext : .The origin of the fossil magnetic fields detected in 5 to 10% of intermediate-mass main sequence stars is still highly debated.
Johns-Krull, C., F. Gallet, Lebreton, Y.,, Johns-Krull, C.,, Bouvier, J.,, Petit, P., Haemmerlé, L., Böhm, T., T. Böhm, Charbonnel, C.,, J. Morin, Haemmerle, L.,, Marsden, S. C., Charbonnel, Corinne, Marsden, C., Morin, J., L. Haemmerlé, Kochukhov, Oleg,, Lebreton, Y., Petit, P.,, C. Charbonnel, Charbonnel, C., Alecian, E.,, Amard, L.,, Hussain, G.,, Alecian, E., Morin, J.,, Folsom, C. P.,, G. Hussain, S. C. Marsden, Folsom, C. P., P. Petit, Hussain, G., Amard, L., E. Alecian, C. Johns-Krull, Marsden, S. C.,, L. Amard, J. Bouvier, C. P. Folsom, Villebrun, F.,, Y. Lebreton, Bouvier, J., O. Kochukhov, Gallet, F.,, Folsom, C., Bohm, T.,, Villebrun, F., Gallet, F., Kochukhov, O., F. Villebrun   +50 more
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M-dwarf stellar winds : the effects of realistic magnetic geometry on rotational evolution and planets [PDF]

, 2014
AAV acknowledges support from a Royal Astronomical Society Fellowship. JM acknowledges support from a fellowship of the Alexander von Humboldt foundation.We perform three-dimensional numerical simulations of stellar winds of early-M-dwarf stars.
Morin, J., Gombosi, T.I., Donati, J.F., Opher, M., Gombosi, Tamás, Jardine, M., Morin, Julien, Gombosi, T. I., Vidotto, A. A., Vidotto, A.A., Donati, J. F., Gombosi, Tamas I., Jardine, M.; id_orcid   +12 more
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Aspects of three-dimensional MHD : magnetic reconnection and rotating coronae [PDF]

, 2010
Solutions of the magnetohydrodynamic (MHD) equations are very important for modelling laboratory, space and astrophysical plasmas, for example the solar and stellar coronae, as well as for modelling many of the dynamic processes that occur in these ...
Al-Salti, Nasser S.
core   +2 more sources

Recent Measurements of Stellar Magnetic Fields [PDF]

Symposium - International Astronomical Union, 1991
High resolution, high S/N spectra have been successfully modeled to yield information on the magnetic properties of cool stars for some 15 years now. These analyses yield estimates of the intensity weighted surface filling factor of active regions, f, and the mean unsigned field strength in these regions), B.
openaire   +1 more source

Estimations and Scaling Laws for Stellar Magnetic Fields [PDF]

The Astrophysical Journal, 2022
Abstract In rapidly rotating turbulence (i.e., a Rossby number much less than unity), the standard mixing length theory for turbulent convection breaks down. However, the Coriolis force enters the force balance such that the magnetic field eventually depends on rotation.
openaire   +2 more sources

Constraints on Magnetic Braking from the G8 Dwarf Stars 61 UMa and τ Cet

The Astrophysical Journal Letters, 2023
During the first half of their main-sequence lifetimes, stars rapidly lose angular momentum to their magnetized winds, a process known as magnetic braking.
Travis S. Metcalfe, Klaus G. Strassmeier, Ilya V. Ilyin, Jennifer L. van Saders, Thomas R. Ayres, Adam J. Finley, Oleg Kochukhov, Pascal Petit, Victor See, Keivan G. Stassun, Sandra V. Jeffers, Stephen C. Marsden, Julien Morin, Aline A. Vidotto   +13 more
doaj   +1 more source

Stellar magnetism : empirical trends with age and rotation [PDF]

, 2014
AAV acknowledges support from a Royal Astronomical Society Fellowship and from the Swiss National Science Foundation via an Ambizione Fellowship. SGG acknowledges support from the Science and Technology Facilities Council (STFC) via an Ernest Rutherford ...
G. Hussain, Jeffers, S., Do Nascimento Jr., J.D., Waite, I.A., R. Fares, Folsom, C. P., Gregory, S. G.; id_orcid, P. Petit, Gregory, S. G., Hussain, G., Donati, J. -F., Jardine, M., M. Jardine, Vidotto, A. A., Petit, P., I. A. Waite, Marsden, S., S. Marsden, Vidotto, A. A, Nascimento Júnior, José Dias do, Donati, J.F., J. Bouvier, J. Morin, J. D. Do Nascimento, Nascimento, J. D. Do, C. P. Folsom, Donati, J. F., Morin, J., Bouvier, J., J. F. Donati, Waite, I. A., Gregory, S.G., Jeffers, Sandra V., Fares, R., Hussain, G. A. J., Cameron, A. C., A. A. Vidotto, Morin, Julien, do Nascimento Jr., J.-D., A. C. Cameron, S. Jeffers, Cameron, A.C., S. G. Gregory, Vidotto, A.A., Folsom, C.P., Do Nascimento, J. D., Cameron, A.C.; id_orcid, Jardine, M.; id_orcid   +47 more
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Core-envelope Decoupling Drives Radial Shear Dynamos in Cool Stars

The Astrophysical Journal Letters, 2023
Differential rotation is thought to be responsible for the dynamo process in stars like our Sun, driving magnetic activity and starspots. We report that starspot measurements in the Praesepe open cluster are strongly enhanced only for stars that depart ...
Lyra Cao, Marc H. Pinsonneault, Jennifer L. van Saders   +2 more
doaj   +1 more source