231 citations · 985 across the 15 of their papers we have counts for
15 papers
Saturn's Magnetic Field at Unprecedented Detail Achieved by Cassini's Close Encounters
Hao Cao, Michele K. Dougherty, Gregory J. Hunt +4
The last 22.5 orbits of the Cassini mission brought the spacecraft to less than 3000 km from Saturn's 1-bar surface. These close encounters offered an unprecedented view of Saturn'…
Direct driving of simulated planetary jets by upscale energy transfer
Vincent G. A. Böning, Paula Wulff, Wieland Dietrich +2
The precise mechanism that forms jets and large-scale vortices on the giant planets is unknown. An inverse cascade has been suggested. Alternatively, energy may be directly injecte…
Linking Zonal Winds and Gravity II: explaining the equatorially antisymmetric gravity moments of Jupiter
Wieland Dietrich, Paula Wulff, Johannes Wicht +1
The recent gravity field measurements of Jupiter (Juno) and Saturn (Cassini) confirm the existence of deep zonal flows reaching to a depth of 5\% and 15\% of the respective radius.…
Linking Zonal Winds and Gravity: The Relative Importance of Dynamic Self Gravity
Johannes Wicht, Wieland Dietrich, Paula Wulff +1
Recent precise measurements at Jupiter's and Saturn's gravity fields constrain the properties of the zonal flows in the outer envelopes of these planets. A simplified dynamic equat…
Global-scale equatorial Rossby waves as an essential component of solar internal dynamics
Björn Löptien, Laurent Gizon, Aaron C. Birch +5
The Sun's complex dynamics is controlled by buoyancy and rotation in the convection zone and by magnetic forces in the atmosphere and corona. While small-scale solar convection is…
Magnetic cycles in a dynamo simulation of fully convective M-star Proxima Centauri
Rakesh K. Yadav, Ulrich R. Christensen, Scott J. Wolk +1
The recent discovery of an Earth-like exoplanet around Proxima Centauri has shined a spot light on slowly rotating fully convective M-stars. When such stars rotate rapidly (period…
Approaching a realistic force balance in geodynamo simulations
Rakesh K. Yadav, Thomas Gastine, Ulrich R. Christensen +2
Earth sustains its magnetic field by a dynamo process driven by convection in the liquid outer core. Geodynamo simulations have been successful in reproducing many observed propert…
Explaining the coexistence of large-scale and small-scale magnetic fields in fully convective stars
Rakesh K. Yadav, Ulrich R. Christensen, Julien Morin +4
Despite the lack of a shear-rich tachocline region low-mass fully convective stars are capable of generating strong magnetic fields, indicating that a dynamo mechanism fundamentall…
Effect of shear and magnetic field on the heat-transfer efficiency of convection in rotating spherical shells
Rakesh K. Yadav, Thomas Gastine, Ulrich R. Christensen +2
We study rotating thermal convection in spherical shells. We base our analysis on a set of about 450 direct numerical simulations of the (magneto)hydrodynamic equations under the B…
Olivine-rich exposures at Bellicia and Arruntia craters on (4) Vesta from Dawn FC
Guneshwar Thangjam, Andreas Nathues, Kurt Mengel +9
We present an analysis of the olivine-rich exposures at Bellicia and Arruntia craters using Dawn Framing Camera (FC) color data. Our results confirm the existence of olivine-rich m…
Formation of starspots in self-consistent global dynamo models: Polar spots on cool stars
Rakesh K. Yadav, Thomas Gastine, Ulrich R. Christensen +1
Observations of cool stars reveal dark spot-like features on their surfaces. Compared to sunspots, starspots can be bigger or cover a larger fraction of the stellar surface. While…
Consistent scaling laws in anelastic spherical shell dynamos
Rakesh K. Yadav, Thomas Gastine, Ulrich R. Christensen +1
Numerical dynamo models always employ parameter values that differ by orders of magnitude from the values expected in natural objects. However, such models have been successful in…
Scaling laws in spherical shell dynamos with free-slip boundaries
Rakesh K. Yadav, Thomas Gastine, Ulrich R. Christensen
Numerical simulations of convection driven rotating spherical shell dynamos have often been performed with rigid boundary conditions, as is appropriate for the metallic cores of te…
The Magnetic Sun: Reversals and Long-Term Variations
K. Petrovay, U. R. Christensen
A didactic introduction to current thinking on some aspects of the solar dynamo is given for geophysicists and planetary scientists.
Mean-field concept and direct numerical simulations of rotating magnetoconvection and the geodynamo
M. Schrinner, K. -H. Raedler, D. Schmitt +2
A comparison is made between mean-field models and direct numerical simulations of rotating magnetoconvection and the geodynamo. The mean-field coefficients are calculated with the…