137 citations · 445 across the 21 of their papers we have counts for
24 papers
Global solar compressible convection simulations on non-Cartesian mappings
Grégoire Doebele, Allan Sacha Brun, Maxime Delorme
Context. Modeling the global dynamics of the Sun requires numerical frameworks capable of simulating the highly turbulent convective envelope and its coupling with the stable radia…
Active nests at solar maximum: How nested flux emergence dominated flaring activity and structured the heliosphere
Adam J. Finley, Allan Sacha Brun, Antoine Strugarek +5
Multi-viewpoint observations from near-Earth satellites and ESA's Solar Orbiter enable a global view of the Sun. This continuous coverage is essential for characterising active nes…
Electron transport in a radiation-dominated plasma Application to solar corona brightenings
Roland Duclous, Vladimir Tikhonchuk, Marina Leboulanger +3
Bremsstrahlung scattering of fast electrons on ions can be enhanced by the microwave radiation present in the solar corona. It can account for the electron diffusive transport alon…
Can meridional flow variations explain the observed rising/declining phase asymmetry in the solar cycle?
Soumitra Hazra, Allan Sacha Brun, Laurene Jouve
Accurate prediction of the 11-year solar cycle remains a major challenge in solar physics and is important for space weather forecasting. A persistent property of the cycle is its…
Avalanches in Magnetohydrodynamical simulations
Henri Lamarre, Paul Charbonneau, Quentin Noraz +5
Scale invariance is a hallmark of many natural systems, including solar flares, where energy release spans a vast range of scales. Recent computational advances, at the level of bo…
A prolific solar flare factory. Nearly continuous monitoring of an active region nest with Solar Orbiter
Adam J. Finley, Allan Sacha Brun, Antoine Strugarek +1
The properties of active region nests, which are locations on the Sun with recurring flux emergence, are poorly constrained by observations from Earth alone. ESA's Solar Orbiter no…
Magnetic activity evolution of solar-like stars: II. -Ro evolution of Kepler main-sequence targets
Savita Mathur, Angela R. G. Santos, Zachary R. Claytor +16
There is now a large sample of stars observed by the Kepler satellite with measured rotation periods and photometric activity index . We use this data, in conjunction w…
Magnetized winds of M-type stars and star-planet magnetic interactions: uncertainties and modeling strategy
Victor Réville, Jamie M. Jasinski, Marco Velli +6
M-type stars are the most common stars in the universe. They are ideal hosts for the search of exoplanets in the habitable zone (HZ), as their small size and low temperature make t…
A multi-dimensional, robust, and cell-centered finite-volume scheme for the ideal MHD equations
Pascal Tremblin, Rémi Bourgeois, Solène Bulteau +6
We present a new multi-dimensional, robust, and cell-centered finite-volume scheme for the ideal MHD equations. This scheme relies on relaxation and splitting techniques and can be…
In search of gravity mode signatures in main sequence solar-type stars observed by Kepler
Sylvain N. Breton, Hachem Dhouib, Rafael A. García +7
Gravity modes (g modes), mixed gravito-acoustic modes (mixed modes), and gravito-inertial modes (gi modes) possess unmatched properties as probes for stars with radiative interiors…
Impact of anti-solar differential rotation in mean-field solar-type dynamos -- Exploring possible magnetic cycles in slowly rotating stars
Quentin Noraz, Allan-Sacha Brun, Antoine Strugarek +1
Over the course of their lifetimes, the rotation of solar-type stars goes through different phases. Once they reach the zero-age main sequence, their global rotation rate decreases…
Solar inertial modes: Observations, identification, and diagnostic promise
Laurent Gizon, Robert H. Cameron, Yuto Bekki +10
The oscillations of a slowly rotating star have long been classified into spheroidal and toroidal modes. The spheroidal modes include the well-known 5-min acoustic modes used in he…
On the sensitivity of magnetic cycles in global simulations of solar-like stars
A. Strugarek, P. Beaudoin, P. Charbonneau +1
The periods of magnetic activity cycles in the Sun and solar-type stars do not exhibit a simple or even single trend with respect to rotation rate or luminosity. Dynamo models can…
Confinement of the solar tachocline by a cyclic dynamo magnetic field
R. Barnabé, A. Strugarek, P. Charbonneau +2
The surprising thinness of the solar tachocline is still not understood with certainty today. Among the numerous possible scenarios suggested to explain its radial confinement, one…
Flux-tube geometry and solar wind speed during an activity cycle
R. F. Pinto, A. S. Brun, A. P. Rouillard
The solar wind speed at 1 AU shows variations in latitude and in time which reflect the evolution of the global background magnetic field during the activity cycle. It is commonly…
Asymptotic theory of gravity modes in rotating stars. I. Ray dynamics
Vincent Prat, François Lignières, Jérôme Ballot
Context. The seismology of early-type stars is limited by our incomplete understanding of gravito-inertial modes. Aims. We develop a short-wavelength asymptotic analysis for gravit…
Dynamo modeling of the Kepler F star KIC 12009504
S. Mathur, K. C. Augustson, A. S. Brun +2
The Kepler mission has collected light curves for almost 4 years. The excellent quality of these data has allowed us to probe the structure and the dynamics of the stars using aste…
Upgrading the Solar-Stellar Connection: News about activity in Cool Stars
H. M. Günther, K. Poppenhaeger, P. Testa +9
In this splinter session, ten speakers presented results on solar and stellar activity and how the two fields are connected. This was followed by a lively discussion and supplement…
Soft X-ray emission in kink-unstable coronal loops
R. F. Pinto, N. Vilmer, A. S. Brun
Solar flares are associated with intense soft X-ray emission generated by the hot flaring plasma. Kink unstable twisted flux-ropes provide a source of magnetic energy which can be…
World-leading science with SPIRou - the nIR spectropolarimeter / high-precision velocimeter for CFHT
X. Delfosse, J. -F. Donati, D. Kouach +22
SPIRou is a near-infrared (nIR) spectropolarimeter / velocimeter proposed as a new-generation instrument for CFHT. SPIRou aims in particular at becoming world-leader on two forefro…
Magnetic confinement of the solar tachocline: The oblique dipole
Strugarek Antoine, Brun Allan Sacha, Zahn Jean-Paul
3D MHD global solar simulations coupling the turbulent convective zone and the radiative zone have been carried out. Essential features of the Sun such as differential rotation, me…
Fast Rotating solar-like stars using asteroseismic datasets
R. A. García, T. Ceillier, T. Campante +27
The NASA Kepler mission is providing an unprecedented set of asteroseismic data. In particular, short-cadence lightcurves (~60s samplings), allow us to study solar-like stars cover…
Influence of the Tachocline on Solar Evolution
A. S. Brun, J. P. Zahn
Recently helioseismic observations have revealed the presence of a shear layer at the base of the convective zone related to the transition from differential rotation in the convec…
Standard Solar Models in the Light of New Helioseismic Constraints: I The Solar Core
A. S. Brun, S. Turck-Chieze, P. Morel
In this paper, we examine a new updated solar model taking advantage of recent reexamination of the nuclear reactions rates and of the microscopic diffusion of helium and heavy ele…