Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Ludovic Petitdemange"'
Publikováno v:
Science
Science, 2023, 379 (6629), pp.300-303. ⟨10.1126/science.abk2169⟩
Science, 2023, 379 (6629), pp.300-303. ⟨10.1126/science.abk2169⟩
International audience; The evolution of a star is influenced by its internal rotation dynamics through transport and mixing mechanisms, which are poorly understood. Magnetic fields can play a role in transporting angular momentum and chemical elemen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed5916464f8642b79385b4a3c31492bd
https://doi.org/10.1126/science.abk2169
https://doi.org/10.1126/science.abk2169
Publikováno v:
Nature Astronomy
Nature Astronomy, Nature Publishing Group, In press, 3 (5), pp.401-407. ⟨10.1038/s41550-019-0713-3⟩
Nature Astronomy, Nature Publishing Group, In press, 3 (5), pp.401-407. ⟨10.1038/s41550-019-0713-3⟩
During recent decades, data from space missions have provided strong evidence of deep liquid oceans underneath a thin outer icy crust on several moons of Jupiter, particularly Europa. But these observations have also raised many unanswered questions
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c1d78cb2a320474a5aa2d48deb4f8cf
https://doi.org/10.1038/s41550-019-0713-3
https://doi.org/10.1038/s41550-019-0713-3
Publikováno v:
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors, Elsevier, 2020, 307, pp.106542. ⟨10.1016/j.pepi.2020.106542⟩
Physics of the Earth and Planetary Interiors, Elsevier, 2020, 307, pp.106542. ⟨10.1016/j.pepi.2020.106542⟩
The dynamo effect is the most popular candidate to explain the non-primordial magnetic fields of astrophysical objects. Although many systematic studies of parameters have already been made to determine the different dynamical regimes explored by dir
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d0c26728adab3487fe57ad7f49c62e3
http://arxiv.org/abs/2007.05530
http://arxiv.org/abs/2007.05530
We investigate the impact of a solid-body rotation $\Omega_0$ on the large-scale dynamics of an incompressible magnetohydrodynamic turbulent flow in presence of a background magnetic field $\bf B_0$ and at low Rossby number. Three-dimensional direct
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce5c808d62fe2edac8d92a242a723d2b
http://arxiv.org/abs/1905.10250
http://arxiv.org/abs/1905.10250
Autor:
Ludovic Petitdemange, Raphaël Raynaud
Publikováno v:
Astro Fluid: An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements
Astro Fluid: An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements, Jun 2016, Paris, 2019, ⟨10.1051/eas/1982031⟩
2019, ⟨10.1051/eas/1982031⟩
Astro Fluid: An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements, Jun 2016, Paris, 2019, ⟨10.1051/eas/1982031⟩
2019, ⟨10.1051/eas/1982031⟩
Numerical modelling of convection driven dynamos in the Boussinesq approximation revealed fundamental characteristics of the dynamo-generated magnetic fields, but the relevance of these results remains to be assessed for highly stratified systems, li
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d25f23f89bb36e9bb4856ea30a69f0f6
https://hal.archives-ouvertes.fr/hal-02426720/document
https://hal.archives-ouvertes.fr/hal-02426720/document
Publikováno v:
Geophysical and Astrophysical Fluid Dynamics
Geophysical and Astrophysical Fluid Dynamics, In press, pp.1-20. ⟨10.1080/03091929.2019.1670827⟩
Geophysical and Astrophysical Fluid Dynamics, Taylor & Francis, In press, pp.1-20. ⟨10.1080/03091929.2019.1670827⟩
Geophysical and Astrophysical Fluid Dynamics, In press, pp.1-20. ⟨10.1080/03091929.2019.1670827⟩
Geophysical and Astrophysical Fluid Dynamics, Taylor & Francis, In press, pp.1-20. ⟨10.1080/03091929.2019.1670827⟩
Stably stratified layers are present in stellar interiors (radiative zones) as well as planetary interiors - recent observations and theoretical studies of the Earth's magnetic field seem to indicate the presence of a thin, stably stratified layer at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff15275c769762733a8539b8cc601c94
https://hal.sorbonne-universite.fr/hal-02344508
https://hal.sorbonne-universite.fr/hal-02344508
Autor:
Ludovic Petitdemange
Publikováno v:
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors, Elsevier, 2018, 277, pp.113-132. ⟨10.1016/j.pepi.2018.02.001⟩
Physics of the Earth and Planetary Interiors, Elsevier, 2018, 277, pp.113-132. ⟨10.1016/j.pepi.2018.02.001⟩
We investigate the nature of the dynamo bifurcation in a configuration applicable to the Earth’s liquid outer core, i.e. in a rotating spherical shell with thermally driven motions with no-slip boundaries. Unlike in previous studies on dynamo bifur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4809084b257d403cf39b52a011f1a71c
https://hal.archives-ouvertes.fr/hal-02320207
https://hal.archives-ouvertes.fr/hal-02320207
Publikováno v:
Fluid Dynamics Research
Fluid Dynamics Research, IOP Publishing, 2018, 50 (1), pp.011415. ⟨10.1088/1873-7005/aa769c⟩
Fluid Dynamics Research, IOP Publishing, 2018, 50 (1), pp.011415. ⟨10.1088/1873-7005/aa769c⟩
In addition to the weak-dipolar state and to the fluctuating-multipolar state, widely discussed in the literature, a third regime has been identified in Dormy (2016). It corresponds to a strong-dipolar branch which appears to approach, in a numerical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f91d9ca01c800ed2444bb2d504faa32
https://hal.archives-ouvertes.fr/hal-02267813
https://hal.archives-ouvertes.fr/hal-02267813
Publikováno v:
Physics of the Earth and Planetary Interiors. 223:21-31
The magnetorotational-instability is central to the understanding of many astrophysical magnetohydrodynamic flows (in particular accretion discs). We have recently shown that a modified version of this instability, the magnetostrophic MRI (MS-MRI), i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5756045da136a96d87bb8b7f1f4632e
https://doi.org/10.1016/j.pepi.2013.03.003
https://doi.org/10.1016/j.pepi.2013.03.003
Autor:
Ludovic Petitdemange
Publikováno v:
Geophysical and Astrophysical Fluid Dynamics
Geophysical and Astrophysical Fluid Dynamics, 2010, 104, pp.287-299. ⟨10.1080/03091921003636496⟩
Geophysical and Astrophysical Fluid Dynamics, 2010, 104, pp.287-299. ⟨10.1080/03091921003636496⟩
International audience; We have shown that a simple, modified version of the Magnetorotational Instability (MRI) can, in principle, develop in the Earth's outer liquid core in the presence of a background shear (see Petitdemange, Dormy and Balbus, Ma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd14226e440c0d2751a002f87397d78e
https://doi.org/10.1080/03091921003636496
https://doi.org/10.1080/03091921003636496