165 citations · 660 across the 23 of their papers we have counts for
25 papers
The Effects of a Stably Stratified Region with radially varying Electrical Conductivity on the Formation of Zonal Winds on Gas Planets
Paula N. Wulff, Ulrich R. Christensen, Wieland Dietrich +1
The outer areas of Jupiter and Saturn have multiple zonal winds, reaching the high latitudes, that penetrate deep into the planets' interiors, as suggested by gravity measurements.…
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…
Magnetic induction processes in Hot Jupiters, application to KELT-9b
Wieland Dietrich, Sandeep Kumar, Anna Julia Poser +4
The small semi-major axes of Hot Jupiters lead to high atmospheric temperatures of up to several thousand Kelvin. Under these conditions, thermally ionised metals provide a rich so…
Ionization and transport in partially ionized multicomponent plasmas: Application to atmospheres of hot Jupiters
Sandeep Kumar, Anna Julia Poser, Manuel Schöttler +5
We study ionization and transport processes in partially ionized multicomponent plasmas. The plasma composition is calculated via a system of coupled mass action laws. The electron…
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…
Dynamo Action of Jupiter's Zonal Winds
Johannes Wicht, Thomas Gastine, Lucia D. V. Duarte +1
The new data delivered by NASA's Juno spacecraft significantly increase our understanding of Jupiter's internal dynamics. The gravity data constrain the depth of the zonal flows ob…
Penetrative Convection in Partly Stratified Rapidly Rotating Spherical Shells
Wieland Dietrich, Johannes Wicht
Celestial objects host interfaces between convective and stable stratified interior regions. The interaction between both, e.g., the transfer of heat, mass, or angular momentum dep…
Dynamo Action in the Steeply Decaying Conductivity Region of Jupiter-like Dynamo Models
Johannes Wicht, Thomas Gastine, Lucia D. V. Duarte
The Juno mission is delivering spectacular data of Jupiter's magnetic field, while the gravity measurements finally allow constraining the depth of the winds observed at cloud leve…
Material Properties for the Interiors of Massive Giant Planets and Brown Dwarfs
Andreas Becker, Mandy Bethkenhagen, Clemens Kellermann +2
We present thermodynamic material and transport properties for the extreme conditions prevalent in the interiors of massive giant planets and brown dwarfs. They are obtained from e…
Modeling and predicting the short term evolution of the Geomagnetic field
Julien Baerenzung, Matthias Holschneider, Johannes Wicht +2
The coupled evolution of the magnetic field and the flow at the Earth's core mantle boundary is modeled within the 1900.0-2014.0 time period. To constraint the dynamical behavior o…
Mercury's magnetic field in the MESSENGER era
Johannes Wicht, Daniel Heyner
MESSENGER magnetometer data show that Mercury's magnetic field is not only exceptionally weak but also has a unique geometry. The internal field resembles an axial dipole that is o…
Physical conditions for Jupiter-like dynamo models
Lucia D. V. Duarte, Johannes Wicht, Thomas Gastine
The Juno mission will measure Jupiter's magnetic field with unprecedented precision and provide a wealth of additional data that will allow to constrain the planet's interior struc…
Scaling regimes in spherical shell rotating convection
T. Gastine, J. Wicht, J. Aubert
Rayleigh-Bénard convection in rotating spherical shells can be considered as a simplified analogue of many astrophysical and geophysical fluid flows. Here, we use three-dimensional…
Reversal and amplification of zonal flows by boundary enforced thermal wind
Wieland Dietrich, Thomas Gastine, Johannes Wicht
Zonal flows in rapidly-rotating celestial objects such as the Sun, gas or ice giants form in a variety of surface patterns and amplitudes. Whereas the differential rotation on the…
Core flows and heat transfer induced by inhomogeneous cooling with sub- and supercritical convection
Wieland Dietrich, Kumiko Hori, Johannes Wicht
The amount and spatial pattern of heat extracted from cores of terrestrial planets is ultimately controlled by the thermal structure of the lower rocky mantle. Using the most commo…
Helicity inversion in spherical convection as a means for equatorward dynamo wave propagation
Lúcia D. V. Duarte, Johannes Wicht, Matthew K. Browning +1
We discuss here a purely hydrodynamical mechanism to invert the sign of the kinetic helicity, which plays a key role in determining the direction of propagation of cyclical magneti…
Effect of width, amplitude, and position of a core mantle boundary hot spot on core convection and dynamo action
Wieland Dietrich, Johannes Wicht, Kumiko Hori
Within the fluid iron cores of terrestrial planets, convection and the resulting generation of global magnetic fields are controlled by the overlying rocky mantle. The thermal stru…
Turbulent Rayleigh-Bénard convection in spherical shells
T. Gastine, J. Wicht, J. M. Aurnou
We simulate numerically Boussinesq convection in non-rotating spherical shells for a fluid with a unity Prandtl number and Rayleigh numbers up to . In this geometry, curvatur…
A Gaussian Model for Simulated Geomagnetic Field Reversals
Johannes Wicht, Domenico Meduri
Field reversals are the most spectacular changes in the geomagnetic field but remain little understood. Paleomagnetic data primarily constrain the reversal rate and provide few add…
Hemispherical Parker waves driven by thermal shear in planetary dynamos
Wieland Dietrich, Dieter Schmitt, Johannes Wicht
Planetary and stellar magnetic fields are thought to be sustained by helical motions (-effect) and, if present, differential rotation (-effect). In the Sun, the strong differ…
A hemispherical dynamo model : Implications for the Martian crustal magnetization
Wieland Dietrich, Johannes Wicht
Mars Global Surveyor measurements revealed that the Martian crust is strongly magnetized in the southern hemisphere while the northern hemisphere is virtually void of magnetization…
Anelastic dynamo models with variable electrical conductivity: an application to gas giants
Lúcia D. V. Duarte, Thomas Gastine, Johannes Wicht
The observed surface dynamics of Jupiter and Saturn is dominated by a banded system of zonal winds. Their depth remains unclear but they are thought to be confined to the very oute…
A domino model for geomagnetic field reversals
N. Mori, D. Schmitt, A. Ferriz-Mas +4
We solve the equations of motion of a one-dimensional planar Heisenberg (or Vaks-Larkin) model consisting of a system of interacting macro-spins aligned along a ring. Each spin has…
The initial temporal evolution of a feedback dynamo for Mercury
D. Heyner, D. Schmitt, J. Wicht +3
Various possibilities are currently under discussion to explain the observed weakness of the intrinsic magnetic field of planet Mercury. One of the possible dynamo scenarios is a d…