Eric G. Blackman
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View article: Tidally Delayed Spin-Down of Very Low Mass Stars
Tidally Delayed Spin-Down of Very Low Mass Stars Open
Very low-mass main-sequence stars reveal some curious trends in observed rotation period distributions that require abating the spin-down that standard rotational evolution models would otherwise imply. By dynamically coupling magnetically…
View article: Terrestrial atmospheric ion implantation occurred in the nearside lunar regolith during the history of Earth’s dynamo
Terrestrial atmospheric ion implantation occurred in the nearside lunar regolith during the history of Earth’s dynamo Open
Light volatile elements in the lunar regolith are thought to be a mixture of the solar wind and Earth's atmosphere, the latter sourced in the absence of geomagnetic field. However, the extent to which both the current and primitive geodyna…
View article: Measurement of turbulent velocity and bounds for thermal diffusivity in laser shock compressed foams by x-ray photon correlation spectroscopy
Measurement of turbulent velocity and bounds for thermal diffusivity in laser shock compressed foams by x-ray photon correlation spectroscopy Open
Experimental benchmarking of transport coefficients under extreme conditions is required for validation of differing theoretical models. To date, measurement of transport properties of dynamically compressed samples remains a challenge wit…
View article: Evolutionary constraints on the solar wind transition epoch and the duration of the terrestrial unmagnetized phase using lunar volatiles deposited from Earth's exosphere
Evolutionary constraints on the solar wind transition epoch and the duration of the terrestrial unmagnetized phase using lunar volatiles deposited from Earth's exosphere Open
The occurrence of H, N, and light noble gases like He, Ne, and Ar in the lunar regolith—but not in lunar rocks—indicates that these volatiles likely have an extra-lunar origin. While the solar wind (SW) is known to implant ions on the luna…
View article: Understanding the Drag Torque in Common Envelope Evolution
Understanding the Drag Torque in Common Envelope Evolution Open
Common envelope (CE) evolution is largely governed by the drag torque applied on the in-spiralling stellar components by the envelope. Previous work has shown that idealized models of the torque based on a single body moving in rectilinear…
View article: Turbulence in Earth’s core generates large topographic torques on the mantle
Turbulence in Earth’s core generates large topographic torques on the mantle Open
e Seismic and geodynamic studies indicate that the boundary between the Earth’s liquid outer core and solid mantle is not spherical, but is likely characterized by topography in the form of inverted mountains and valleys that have typical …
View article: Theory of x-ray photon correlation spectroscopy for multiscale flows
Theory of x-ray photon correlation spectroscopy for multiscale flows Open
Complex multiscale flows associated with instabilities and turbulence are commonly induced under high-energy density (HED) conditions, but accurate measurement of their transport properties has been challenging. X-ray photon correlation sp…
View article: Understanding large-scale dynamos in unstratified rotating shear flows
Understanding large-scale dynamos in unstratified rotating shear flows Open
We combine simulations with new analyses that overcome previous pitfalls to explicate how nonhelical mean-field dynamos grow and saturate in unstratified, magnetorotationally driven turbulence. Shear of the mean radial magnetic field ampli…
View article: Collisionless ion-electron energy exchange in magnetized shocks
Collisionless ion-electron energy exchange in magnetized shocks Open
Energy partition between ions and electrons in collisionless shocks has long been an unsolved fundamental physical problem. We show that kinetic simulations of moderate Alfvénic Mach number, magnetized, collisionless shocks reveal rapid, f…
View article: Early solar wind and dynamo magnetic field topology predictions for (16) Psyche and other asteroids
Early solar wind and dynamo magnetic field topology predictions for (16) Psyche and other asteroids Open
Asteroid (16) Psyche is a metal-rich body that might record an ancient coherent magnetization if some relict crust or mantle is preserved. Herein, we use magnetohydrodynamic simulations to predict (16) Psyche's field, assuming it has such …
View article: Particle acceleration during classical phase transitions on a spherical lattice
Particle acceleration during classical phase transitions on a spherical lattice Open
When compressed, certain lattices undergo phase transitions that may allow nuclei to gain significant kinetic energy. To explore the dynamics of this phenomenon, we develop a methodology to study Coulomb coupled N -body systems constrained…
View article: Second-generation planet formation after tidal disruption from common envelope evolution
Second-generation planet formation after tidal disruption from common envelope evolution Open
We propose that certain white dwarf (WD) planets, such as WD 1856+534 b, may form out of material from a stellar companion that tidally disrupts from common envelope evolution with the WD progenitor star. The disrupted companion shreds int…
View article: Constraining the origin of magnetic white dwarfs
Constraining the origin of magnetic white dwarfs Open
The origin of magnetic white dwarfs (MWDs) has been a long-standing puzzle. Proposed origin mechanisms have included: fossil fields frozen in from the progenitor convective core; a dynamo in the progenitor envelope; crystallization dynamos…
View article: Terrestrial atmospheric ion implantation occurred in the nearside lunar regolith during the history of Earth's dynamo
Terrestrial atmospheric ion implantation occurred in the nearside lunar regolith during the history of Earth's dynamo Open
Light volatile elements in lunar regolith are thought to be a mixture of the solar wind and Earth's atmosphere, the latter sourced in the absence of geomagnetic field. However, the extent to which both the current and primitive geodynamo i…
View article: Tidally Delayed Spin-Down of Very Low Mass Stars
Tidally Delayed Spin-Down of Very Low Mass Stars Open
Very low-mass main-sequence stars reveal some curious trends in observed rotation period distributions that require abating the spin-down that standard rotational evolution models would otherwise imply. By dynamically coupling magnetically…
View article: Turbulence in Earth's core generates large topographic torques on the mantle
Turbulence in Earth's core generates large topographic torques on the mantle Open
Seismic and geodynamic studies indicate that the boundary between the Earth's liquid outer core and solid mantle is not spherical, but is likely characterized by topography in the form of inverted mountains and valleys that have typical am…
View article: Crystal Ball: A Simple Model for Phase Transitions on a Classical Spherical Lattice
Crystal Ball: A Simple Model for Phase Transitions on a Classical Spherical Lattice Open
When compressed, certain lattices undergo phase transitions that may allow nuclei to gain significant kinetic energy. To explore the dynamics of this phenomenon, we develop a framework to study Coulomb coupled N-body systems constrained to…
View article: Study of magnetic reconnection at low-$β$ using laser-powered capacitor coils
Study of magnetic reconnection at low-$β$ using laser-powered capacitor coils Open
Magnetic reconnection is a ubiquitous fundamental process in space and astrophysical plasmas that rapidly converts magnetic energy into some combination of flow energy, thermal energy, and non-thermal energetic particles. Over the past dec…
View article: Study of magnetic reconnection at low-β using laser-powered capacitor coils
Study of magnetic reconnection at low-β using laser-powered capacitor coils Open
Magnetic reconnection is a ubiquitous fundamental process in space and astrophysical plasmas that rapidly converts magnetic energy into some combination of flow energy, thermal energy, and non-thermal energetic particles. Over the past dec…
View article: High-Speed Outflows and Dusty Disks during the AGB to PN Transition: The PANORAMA survey
High-Speed Outflows and Dusty Disks during the AGB to PN Transition: The PANORAMA survey Open
As mass-losing asymptotic giant branch (AGB) stars evolve to planetary nebulae (PNe), the mass outflow geometries transform from nearly spherical to extreme aspherical. The physical mechanisms governing this transformation are widely belie…
View article: Thermal and magnetic evolution of an Earth-like planet with a basal magma ocean
Thermal and magnetic evolution of an Earth-like planet with a basal magma ocean Open
Earth's geodynamo has operated for over 3.5 billion years. The magnetic field is currently powered by thermocompositional convection in the outer core, which involves the release of light elements and latent heat as the inner core solidifi…
View article: Structure and dynamics of magneto-inertial, differentially rotating laboratory plasmas
Structure and dynamics of magneto-inertial, differentially rotating laboratory plasmas Open
We present a detailed characterization of the structure and evolution of differentially rotating plasmas driven on the MAGPIE pulsed-power generator (1.4 MA peak current, 240 ns rise time). The experiments were designed to simulate physics…
View article: Second-generation planet formation after tidal disruption from common envelope evolution
Second-generation planet formation after tidal disruption from common envelope evolution Open
We propose that certain white dwarf (WD) planets, such as WD 1856+534 b, may form out of material from a stellar companion that tidally disrupts from common envelope evolution with the WD progenitor star. The disrupted companion shreds int…
View article: Magnetization and age of ca. 544 Ma syenite, eastern Canada: Evidence for renewal of the geodynamo
Magnetization and age of ca. 544 Ma syenite, eastern Canada: Evidence for renewal of the geodynamo Open
The ca. 565 Ma Ediacaran geodynamo was highly unusual, producing an ultralow field 10 times weaker than present-day value of 8 x 1022 A m2. A ∼5 times rise in field strength is seen in time-averaged single crystal paleointensity data of ca…
View article: Correction to: Why the observed spin evolution of older-than-solar-like stars might not require a dynamo mode change
Correction to: Why the observed spin evolution of older-than-solar-like stars might not require a dynamo mode change Open
Our paper 'Why the observed spin evolution of older-than-solar like stars might not require a dynamo mode change' was published in MNRAS 522 , 1583-1590 ( 2023).Here we correct several minor typographical errors that do not affect our resu…
View article: Structure and Dynamics of Magneto-Inertial, Differentially Rotating Laboratory Plasmas
Structure and Dynamics of Magneto-Inertial, Differentially Rotating Laboratory Plasmas Open
We present a detailed characterization of the structure and evolution of differentially rotating plasmas driven on the MAGPIE pulsed-power generator (1.4 MA peak current, 240 ns rise-time). The experiments were designed to simulate physics…
View article: Ediacaran ultra-weak geomagnetic field, oxygen rise, and the diversification of macroscopic animals
Ediacaran ultra-weak geomagnetic field, oxygen rise, and the diversification of macroscopic animals Open
A major discovery in the last 5 years has been the recognition that the geomagnetic field was at ultralow field strengths, some ten times weaker than the present-day, during the Ediacaran Period. These ultralow values were first reported f…