23 citations · 110 across the 12 of their papers we have counts for
7 papers · 1 filter
Deviation of Mercury's spin axis from an exact Cassini state induced by dissipation
Ian MacPherson, Mathieu Dumberry
We compute predictions of the deviation of Mercury's spin axis from an exact Cassini state caused by tidal dissipation, and viscous and electromagnetic (EM) friction at the core-ma…
Weak magnetic field changes over the Pacific due to high conductance in lowermost mantle
Mathieu Dumberry, Colin More
For the past few centuries, the temporal variation in the Earth's magnetic field in the Pacific region has been anomalously low. The reason for this is tied to large scale flows in…
Convectively driven decadal zonal accelerations in Earth's fluid core
Colin More, Mathieu Dumberry
Azimuthal accelerations of cylindrical surfaces co-axial with the rotation axis have been inferred to exist in Earth's fluid core on the basis of magnetic field observations and ch…
The Cassini State of the Moon's inner core
Christopher Stys, Mathieu Dumberry
We present a model of the precession dynamics of the Moon that comprises a fluid outer core and a solid inner core. We show that three Cassini states associated with the inner core…
A past lunar dynamo thermally driven by the precession of its inner core
Christopher Stys, Mathieu Dumberry
The Cassini state equilibrium associated with the precession of the Moon predicts that the mantle, fluid core and solid inner core precess at different angles. We present estimates…
Viscoelastic relaxation within the Moon and the phase lead of its Cassini state
Olivier Organowski, Mathieu Dumberry
Analyses of Lunar Laser Ranging data show that the spin-symmetry axis of the Moon is ahead of its expected Cassini state by an angle of = 0.27 arcsec. This indicates the pres…
Viscous dissipation in the fluid core of the Moon
Jiarui Zhang, Mathieu Dumberry
The spin axes of the mantle, fluid core and solid inner core of the Moon precess at frequency yr though with different orientations, leading to viscous frictio…