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An Efficient Solver for the Richards Equation for Variably Saturated Flows in Porous Media
Announce Type: new Abstract: We present a nonlinear multigrid solver for the Richards equation in variably saturated porous media with strongly nonlinear hydraulic conductivity and water-retention relationships. The governing equation is discretized using a second-order conservative finite-difference scheme in space and an implicit backward differentiation formula in time. The core component of the solver is a nonlinear Gauss--Seidel (NGS) smoother based on a triangular splitting of the...
Astronomers discover exoplanets with magnetic fields
Astronomers discover exoplanets with magnetic fields WASHINGTON: Based on the behaviour of winds on seven large and hot gas exoplanets, astronomers have obtained the strongest evidence to date that planets beyond our solar system possess magnetic fields, like Earth and five other planets in our solar system. The finding, based on observations by telescopes in Chile and Hawaii, deepens the understanding of exoplanets by showing that at least some share an important characteristic present in...
'Totally counterintuitive': Scientists accidentally discover magnetic fields around 7 distant planets, opening new window in the search for life
'Totally counterintuitive': Scientists accidentally discover magnetic fields around 7 distant planets, opening new window in the search for life In an astronomical first, researchers have measured the magnetic fields of seven "hot Jupiter" planets beyond our solar system — adding new clues in the search for alien life. In a first-of-its-kind discovery, astronomers claim they have directly measured the magnetic fields of multiple planets beyond our solar system — potentially providing a...
Strange winds on seven hot Jupiters reveal strongest signs yet of exoplanet magnetic activity
Strange winds on seven hot Jupiters reveal strongest signs yet of exoplanet magnetic activity Sadie Harley Scientific Editor Robert Egan Associate Editor A team of astronomers has found the strongest evidence yet that some planets outside our solar system may be magnetic. Using the European Southern Observatory's Very Large Telescope (ESO's VLT) and the Gemini North telescope, the researchers measured wind speeds on seven very hot, Jupiter-like exoplanets. The observations reveal that the...
French Open: Thursday's order of play as women's semi-finals take place
French Open: Order of play, men's and women's draw and results with Mirra Andreeva, Marta Kostyuk, Diana Shnaider, Maja Chwalinska playing Mirra Andreeva plays Marta Kostyuk, and Diana Shnaider vs Maja Chwalinska in Thursday's women's French Open semi-finals; Tournament will see first-time Grand Slam winner; watch ATP and WTA Tours live on Sky Sports Tennis, Sky Sports+, stream via NOW and the Sky Sports app Wednesday 3 June 2026 15:33, UK Thursday's French Open order of play features full...
UN Security Council defeat raises questions about Germany's global standing
Germany failed to get the 127 votes required for a seat on the UN Security Council. For Euronews, Alexander Wolf explains why. Germany has lost the election to the UN Security Council.
'Hot Jupiter' winds blasting at over 15,000 mph reveal 1st evidence of exoplanets with magnetic fields
'Hot Jupiter' winds blasting at over 15,000 mph reveal 1st evidence of exoplanets with magnetic fields "A key step toward ultimately understanding which planets can stay alive, keep their water, and perhaps even, one day, host life as we know it." Astronomers have discovered the first evidence of magnetic fields around planets beyond the solar system, and they did so by studying the worlds' high-speed, violent winds. This marks the first direct measurement of exoplanet magnetic field...
Block Jacobi/Gauss-Seidel preconditioning for GLT sequences, and GLH sequences
arXiv:2606.01888v1 Announce Type: new Abstract: The theory of generalized locally Toeplitz (GLT) sequences is an apparatus for computing the spectral and singular value distribution of sequences of matrices that possess a (possibly hidden) Toeplitz-like structure.