Further evidence for early lunar magnetism from troctolite 76535
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Geophysical Research"
DOI: 10.1002/2016je005154
Abstract: The earliest history of the lunar dynamo is largely unknown and has important implications for the thermal state of the Moon and the physics of dynamo generation. The lunar sample with the oldest known paleomagnetic… read more here.
Keywords: lunar; field; troctolite 76535; dynamo ... See more keywords
A Model of a Tidally Synchronized Solar Dynamo
Sign Up to like & getrecommendations! Published in 2019 at "Solar Physics"
DOI: 10.1007/s11207-019-1447-1
Abstract: We discuss a solar dynamo model of Tayler–Spruit type whose Ω$\Omega $-effect is conventionally produced by a solar-like differential rotation but whose α$\alpha $-effect is assumed to be periodically modulated by planetary tidal forcing. This… read more here.
Keywords: dynamo model; model tidally; dynamo; tidally synchronized ... See more keywords
Nonkinematic solar dynamo models with double-cell meridional circulation
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Atmospheric and Solar-Terrestrial Physics"
DOI: 10.1016/j.jastp.2018.07.010
Abstract: Abstract Employing the standard solar interior model as input we construct a dynamically-consistent nonlinear dynamo model that takes into account the detailed description of the Λ - effect, turbulent pumping, magnetic helicity balance, and magnetic… read more here.
Keywords: double cell; cell meridional; meridional circulation; dynamo ... See more keywords
Large-scale-vortex dynamos in planar rotating convection
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2017.56
Abstract: Several recent studies have demonstrated how large-scale vortices may arise spontaneously in rotating planar convection. Here, we examine the dynamo properties of such flows in rotating Boussinesq convection. For moderate values of the magnetic Reynolds… read more here.
Keywords: large scale; scale vortex; dynamo; convection ... See more keywords
Possible approach to detecting the mysterious Saturnian convective dynamo through gravitational sounding
Sign Up to like & getrecommendations! Published in 2020 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/202038906
Abstract: Context.Planetary dynamo research is mathematically and numerically difficult. Forward calculations are numerically expensive and subject to much uncertainty in key magnetohydrodynamics parameters. For a gaseous planet such as Saturn, even the precise location of its… read more here.
Keywords: dynamo; gravitational sounding; convective dynamo; mission ... See more keywords
Dynamo modelling for cycle variability and occurrence of grand minima in Sun-like stars: rotation rate dependence
Sign Up to like & getrecommendations! Published in 2023 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1105
Abstract: Like the solar cycle, stellar activity cycles are also irregular. Observations reveal that rapidly rotating (young) Sun-like stars exhibit a high level of activity with no Maunder-like grand minima and rarely display smooth regular activity… read more here.
Keywords: sun like; stars rotation; dynamo; minima ... See more keywords
Spatio-temporal non-localities in a solar-like mean-field dynamo
Sign Up to like & getrecommendations! Published in 2023 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1150
Abstract: The scale separation approximation, which is in the base of the solar mean field dynamo models, can be hardly justified both by observations and theoretical applications to astrophysical dynamos. The general expression for the mean… read more here.
Keywords: field dynamo; dynamo; electromotive force; model ... See more keywords
What is a large-scale dynamo?
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society: Letters"
DOI: 10.1093/mnrasl/slw190
Abstract: We consider kinematic dynamo action in a sheared helical flow at moderate to high values of the magnetic Reynolds number Rm. We find exponentially growing solutions which, for large enough shear, take the form of… read more here.
Keywords: large scale; dynamo; scale dynamo;
Objective vortex detection in an astrophysical dynamo
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnrasl/slw248
Abstract: A novel technique for detecting Lagrangian vortices is applied to a helical magnetohydrodynamic dynamo simulation. The vortices are given by tubular level surfaces of the Lagrangian averaged vorticity deviation, the trajectory integral of the normed… read more here.
Keywords: dynamo; detection astrophysical; objective vortex; vortex detection ... See more keywords
A two-billion-year history for the lunar dynamo
Sign Up to like & getrecommendations! Published in 2017 at "Science Advances"
DOI: 10.1126/sciadv.1700207
Abstract: Paleomagnetic evidence suggests the lunar dynamo persisted beyond 2.5 Ga, requiring an exceptionally long-lived power source. Magnetic studies of lunar rocks indicate that the Moon generated a core dynamo with surface field intensities of ~20… read more here.
Keywords: dynamo; billion year; history; two billion ... See more keywords