Results 21 to 30 of about 41,413 (274)
Timing of the martian dynamo: New constraints for a core field 4.5 and 3.7 Ga ago
Science Advances, 2020 MAVEN magnetic field data indicate that a martian dynamo field was active 4.5 and 3.7 Ga ago. The absence of crustal magnetic fields above the martian basins Hellas, Argyre, and Isidis is often interpreted as proof of an early, before 4.1 billion years ...
A. Mittelholz +5 more
semanticscholar +1 more source
Science Advances, 2020 The lunar dynamo ceased by 0.8 billion years ago. Magnetic measurements of the lunar crust and Apollo samples indicate that the Moon generated a dynamo magnetic field lasting from at least 4.2 until
S. Mighani +5 more
semanticscholar +1 more source
eLife, 2017 To optimize fitness a plant should monitor its metabolism to appropriately control growth and defense. Primary metabolism can be measured by the universally conserved TOR (Target of Rapamycin) pathway to balance growth and development with the available ...
Frederikke Gro Malinovsky +6 more
doaj +1 more source
Global bifurcations to subcritical magnetorotational dynamo action in Keplerian shear flow [PDF]
, 2013 Magnetorotational dynamo action in Keplerian shear flow is a three-dimensional, non-linear magnetohydrodynamic process whose study is relevant to the understanding of accretion processes and magnetic field generation in astrophysics.
Cossu, Carlo +12 more
core +1 more source
Symposium - International Astronomical Union, 1989 We critically review the status of our current understanding of galactic dynamo theory. In brief, a definitive model for the production of magnetic fields on galactic scales remains to be constructed.
R. Rosner, E. Deluca
openaire +1 more source
Frontiers in Plant Science, 2017 Within the cell, biosynthetic pathways are embedded in protein-protein interaction networks. In Arabidopsis, the biosynthetic pathways of aliphatic and indole glucosinolate defense compounds are well-characterized.
Sebastian J. Nintemann +6 more
doaj +1 more source
A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization
Geophysical Research Letters, 2021 The existence of numerous iron meteorite groups indicates that some planetesimals underwent melting that led to metal‐silicate segregation, sometimes producing metallic cores.
Clara Maurel +6 more
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General Relativistic Magnetohydrodynamics Mean-Field Dynamos
Fluids, 2022 Large-scale, ordered magnetic fields in several astrophysical sources are supposed to be originated, and maintained against dissipation, by the combined amplifying action of rotation and small-scale turbulence. For instance, in the solar interior, the so-
Luca Del Zanna +4 more
doaj +1 more source
A silicate dynamo in the early Earth
Nature Communications, 2020 The Earth’s magnetic field has operated for at least 3.4 billion years, yet how the ancient field was produced is still unknown. The core in the early Earth was surrounded by a molten silicate layer, a basal magma ocean that may have survived for more ...
L. Stixrude, R. Scipioni, M. Desjarlais
semanticscholar +1 more source
From Primordial Seed Magnetic Fields to the Galactic Dynamo [PDF]
Galaxies, 2019 The origin and maintenance of coherent magnetic fields in the Universe is reviewed with an emphasis on the possible challenges that arise in their theoretical understanding.
K. Subramanian
semanticscholar +1 more source