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Christophe Gissinger
Associate professor at Ecole Normale Superieure (ENS Paris)
Nature Astronomy - News
A magnetically driven equatorial jet in Europa's ocean europa

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 regarding the oceanic motions generated under the ice, or the mechanisms leading to the geological features observed on Europa. By means of direct numerical simulations of Europa's interior, we show here that Jupiter's magnetic field generates a retrograde oceanic jet at the equator, which may influence the global dynamics of Europa's ocean and contribute to the formation of some of its surface features by applying a unidirectional torque on Europa's ice shell. C. Gissinger, L. Petitdemange

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Physics Review Fluids - News
Instabilities of MHD flows driven by traveling magnetic fields Pump

A numerical study shows that an electrically conducting fluid driven by a traveling magnetic field always exhibits a Joule dissipation larger than the viscous one. This surprising result suggests the existence of an upper bound for the efficiency of electromagnetic pumps, which can’t exceed 50%. K.S. Reddy, C. Gissinger, S. Fauve

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SFP-Societe Francaise de Physique
Un nouveau scenario pour les dynamos stellaires ? dipole

La Terre possède un champ magnétique, et heureusement ! Celui-ci agit en effet comme un bouclier qui nous protège d’un bombardement constant par les particules de vent solaire. Mais elle n’est pas le seul corps céleste dans ce cas : le Soleil possède également son propre champ magnétique, tout comme de nombreuses planètes, étoiles et galaxies. L’origine et la persistance de ces champs magnétiques astrophysiques posent encore beaucoup de questions fondamentales [...]

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EGU meeting
Vienna Austria, 7-12 April 2019 dipole

The EGU General Assembly 2019 will bring together geoscientists from all over the world to one meeting covering all disciplines of the Earth, planetary and space sciences. The EGU aims to provide a forum where scientists, especially early career researchers, can present their work and discuss their ideas with experts in all fields of geoscience.

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AGU-2019
San Francisco, USA, 09-13 December 2019 dipole

As AGU marks its Centennial in 2019, we return to San Francisco, the home of the Fall Meeting for more than 40 years. Join our diverse community at the newly renovated Moscone Center as we collaborate across borders and boundaries to explore and develop our research. Don't miss this once-in-a-lifetime opportunity to participate in Centennial presentations and special events that will bring to life the past, present and the future of our science (...)

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Physics Nobel prize 2018
2 october 2018 dipole

Arthur Ashkin, Gerard Mourou, and Donna Strickland have been awarded this year's Nobel Prize in Physics for their groundbreaking work in the field of laser physics. Ashkin is recognized for his invention of optical tweezers, which has become a powerful tool for studying biological molecules and cells. Mourou and Strickland are honored for developing techniques to produce high-intensity, ultra-short optical pulses that have wide uses in engineering, chemistry, and medicine. Strickland is the third woman to be selected as a Nobel Laureate in Physics since the prize was first awarded in 1901.

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