231 citations · 1.6k across the 58 of their papers we have counts for
41 papers · 1 filter
Formation and rising phase of a flux rope through data-constrained simulations
M. V. Sieyra, A. Strugarek, A. Prasad +8
Context. Data-constrained models incorporate observed photospheric magnetic fields. However, due to the lack of magnetic field information in the rest of the solar atmosphere, mode…
Forecasting the solar cycle using variational data assimilation: validation on cycles 22 to 25
L. Jouve, C. P. Hung, A. S. Brun +5
Forecasting future solar activity has become crucial in our modern world, where intense eruptive phenomena mostly occurring during solar maximum are likely to be strongly damaging…
On stellar hotspots due to star-planet magnetic interactions: How much power can actually be transmitted to the chromosphere?
Arghyadeep Paul, Antoine Strugarek, Victor Réville
Star-Planet Magnetic Interactions (SPMI) have been proposed as a mechanism for generating stellar hot-spots with energy outputs on the order of watts. This interaction…
Global Turbulent Solar Convection: a Numerical Path Investigating Key Force Balances in the context of the Convective Conundrum
Quentin Noraz, Allan Sacha Brun, Antoine Strugarek
Understanding solar turbulent convection and its influence on differential rotation has been a challenge over the past two decades. Current models often overestimate giant convecti…
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…
Measuring stellar surface rotation and activity with the PLATO mission -- I. Strategy and application to simulated light curves
S. N. Breton, A. F Lanza, S. Messina +20
The Planetary Transits and Oscillations of stars mission (PLATO) will allow us to measure surface rotation and monitor photometric activity of tens of thousands of main sequence so…
Magnetochronology of solar-type star dynamos
Quentin Noraz, Allan Sacha Brun, Antoine Strugarek
Aims. In this study, we analyse the magnetic field properties of a set of 15 global magnetohydrodynamics (MHD) simulations of solar-type star dynamos conducted using the ASH code.…
Dynamics of the tachocline
Antoine Strugarek, Bernadett Belucz, Allan Sacha Brun +2
The solar tachocline is an internal region of the Sun possessing strong radial and latitudinal shears straddling the base of the convective envelope. Based on helioseismic inversio…
Hunting for anti-solar differentially rotating stars using the Rossby number -- An application to the Kepler field
Quentin Noraz, Sylvain N. Breton, Allan Sacha Brun +5
Anti-solar differential rotation profiles have been found for decades in numerical simulations of convective envelopes of solar-type stars. These profiles are characterized by a sl…
Implicit large eddy simulations of global solar convection: effects of numerical resolution in non-rotating and rotating cases
G. Guerrero, A. M. Stejko, A. G. Kosovichev +2
Simulating deep solar convection and its coupled mean-field motions is a formidable challenge where few observational results constrain models that suffer from the non-physical inf…
Validation of a wave heated 3D MHD coronal-wind model using Polarized Brightness and EUV observations
Susanna Parenti, Victor Réville, Allan Sacha Brun +5
The physical properties responsible for the formation and evolution of the corona and heliosphere are still not completely understood. 3D MHD global modeling is a powerful tool to…
MOVES V. Modelling star-planet magnetic interactions of HD 189733
A. Strugarek, R. Fares, V. Bourrier +10
Magnetic interactions between stars and close-in planets may lead to a detectable signal on the stellar disk. HD 189733 is one of the key exosystems thought to harbor magnetic inte…
Powering Stellar Magnetism: Energy Transfers in Cyclic Dynamos of Sun-like Stars
Allan Sacha Brun, Antoine Strugarek, Quentin Noraz +5
We use the ASH code to model the convective dynamo of solar-type stars. Based on a series of 15 3-D MHD simulations spanning 4 bins in rotation and mass, we show what mechanisms ar…
Flux ropes and dynamics of the heliospheric current sheet
V. Réville, N. Fargette, A. P. Rouillard +19
Context. Solar Orbiter and PSP jointly observed the solar wind for the first time in June 2020, capturing data from very different solar wind streams, calm and Alfvénic wind as wel…
Physics of star-planet magnetic interactions
Antoine Strugarek
Magnetic interactions between a planet and its environment are known to lead to aurorae and shocks in the solar system. The large number of close-in exoplanets that have been disco…
Dynamical coupling of a mean-field dynamo and its wind: Feedback loop over a stellar activity cycle
Barbara Perri, Allan Sacha Brun, Antoine Strugarek +1
We focus on the connection between the internal dynamo magnetic field and the stellar wind. If the star has a cyclic dynamo, the modulations of the magnetic field can affect the wi…
Modeling Solar Wind Variations over an 11-yr Cycle with Alfvén Wave Dissipation: a Parameter Study
Soumitra Hazra, Victor Réville, Barbara Perri +3
We study the behaviour and properties of the solar wind using a 2.5D Alfvén wave driven wind model. We first systematically compare the results of an Alfvén wave (AW) driven wind m…
Impact of solar magnetic field amplitude and geometry on cosmic rays diffusion coefficients in the inner heliosphere
Barbara Perri, Allan Sacha Brun, Antoine Strugarek +1
Cosmic rays (CRs) are tracers of solar events when they are associated with solar flares, but also galactic events when they come from outside our solar system. SEPs are correlated…
The Solar Orbiter Science Activity Plan: translating solar and heliospheric physics questions into action
I. Zouganelis, A. De Groof, A. P. Walsh +182
Solar Orbiter is the first space mission observing the solar plasma both in situ and remotely, from a close distance, in and out of the ecliptic. The ultimate goal is to understand…
Alfvén-wave driven magnetic rotator winds from low-mass stars I: rotation dependences of magnetic braking and mass-loss rate
Munehito Shoda, Takeru K. Suzuki, Sean P. Matt +7
Observations of stellar rotation show that low-mass stars lose angular momentum during the main sequence. We simulate the winds of Sun-like stars with a range of rotation rates, co…
Tearing instability and periodic density perturbations in the slow solar wind
Victor Réville, Marco Velli, Alexis Rouillard +4
In contrast with the fast solar wind, that originates in coronal holes, the source of the slow solar wind is still debated. Often intermittent and enriched with low FIP elements --…
From Stellar Coronæ to Gyrochronology: a theoretical and observational exploration
Jérémy Ahuir, Allan-Sacha Brun, Antoine Strugarek
Context. Stellar spin-down is the result of a complex process involving rotation, dynamo, wind and magnetism. Multi-wavelength surveys of solar-like stars have revealed the likely…
The dynamo-wind feedback loop: Assessing their non-linear interplay
Barbara Perri, Allan Sacha Brun, Antoine Strugarek +1
Though generated deep inside the convection zone, the solar magnetic field has a direct impact on the Earth space environment via the Parker spiral. It strongly modulates the solar…
Could star-planet magnetic interactions lead to planet migration and influence stellar rotation ?
Jérémy Ahuir, Antoine Strugarek, Allan-Sacha Brun +5
The distribution of hot Jupiters, for which star-planet interactions can be significant, questions the evolution of exosystems. We aim to follow the orbital evolution of a planet a…