Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago

@article{Tarduno2010GeodynamoSW,
  title={Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago},
  author={John A. Tarduno and Rory D. Cottrell and Michael K. Watkeys and Axel Hofmann and Pavel V. Doubrovine and Eric E. Mamajek and Dunji Liu and David Gary Sibeck and Levi Neukirch and Yoichi Usui},
  journal={Science},
  year={2010},
  volume={327},
  pages={1238 - 1240}
}
Early Origin of Earth's Magnetic Field Earth's magnetic field protects us from stellar winds and radiation from the Sun. Understanding when, during the Earth's formation, the large-scale magnetic field was established is important because it impacts understanding of the young Earth's atmosphere and exosphere. By analyzing ancient silicate crystals, Tarduno et al. (p. 1238; see the Perspective by Jardine) demonstrate that the Earth's magnetic field existed 3.4 to 3.45 billion years ago, pushing… 
A Hadean to Paleoarchean geodynamo recorded by single zircon crystals
TLDR
Full-vector paleointensity measurements of Archean to Hadean zircons bearing magnetic inclusions from the Jack Hills conglomerate are reported to reconstruct the early geodynamo history and imply that early atmospheric evolution on both Earth and Mars was regulated by dynamo behavior.
Sustaining Earth’s magnetic dynamo
Earth’s magnetic field is generated by fluid motions in the outer core. This geodynamo has operated for over 3.4 billion years. However, the mechanism that has sustained the geodynamo for over 75% of
A silicate dynamo in the early Earth
TLDR
The authors find that the electrical conductivity of silicate liquid at high pressure and temperature conditions could have been sufficient to generate a silicate dynamo and a magnetic field in the early Earth.
Powering Earth’s dynamo with magnesium precipitation from the core
TLDR
It is shown that the precipitation of magnesium-bearing minerals from the core could have served as an alternative power source and that Earth’s dynamo would survive throughout geologic time even if core radiogenic heating were minimal and core cooling were slow.
Modeling the Young Sun's Solar Wind and its Interaction with Earth's Paleomagnetosphere
[1] We present a focused parameter study of solar wind–magnetosphere interaction for the young Sun and Earth, ∼3.5 Gyr ago, that relies on magnetohydrodynamic (MHD) simulations for both the solar
Implications of a long‐lived basal magma ocean in generating Earth's ancient magnetic field
Observations of Earth's magnetic field extending back to 3.45 billion years ago indicate that generation by a core dynamo must be sustained over most of Earth's history. However, recent estimates of
Earth science: Another energy source for the geodynamo
TLDR
It is suggested that equilibration at high temperatures in the aftermath of giant impacts on the early Earth allowed a small amount of magnesium to partition into the core, and shown that the transport of magnesium as oxide or silicate from the cooling core to underplate the mantle is a more efficient source of buoyancy than inner core growth.
An early geodynamo driven by exsolution of mantle components from Earth’s core
TLDR
Using core-formation models, experiments are presented showing that magnesium oxide dissolves in core-forming iron melt at very high temperatures, resolving the conundrum posed by the existence of an ancient magnetic field prior to the formation of the inner core.
The evolution of Earth’s magnetosphere during the solar main sequence
As a star spins-down during the main sequence, its wind properties are affected. In this work, we investigate how Earth’s magnetosphere has responded to the change in the solar wind. Earth’s
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 67 REFERENCES
Geomagnetic field strength 3.2 billion years ago recorded by single silicate crystals
TLDR
3.2-Gyr-old field strengths that are within 50 per cent of the present-day value are found, indicating that a viable magnetosphere sheltered the early Earth’s atmosphere from solar wind erosion.
The Cretaceous superchron geodynamo: Observations near the tangent cylinder
TLDR
P paleomagnetic and paleointensity data from lavas of the Cretaceous Normal Polarity Superchron that formed at high latitudes near the tangent cylinder that surrounds the solid inner core suggest that the basic features of the geomagnetic field are intrinsically related.
A crystallizing dense magma ocean at the base of the Earth’s mantle
TLDR
It is shown that a stable layer of dense melt formed at the base of the mantle early in the Earth’s history would have undergone slow fractional crystallization, and would be an ideal candidate for an unsampled geochemical reservoir hosting a variety of incompatible species for an initial basal magma ocean thickness of about 1,000 km.
A Comparative Study of the Influence of the Active Young Sun on the Early Atmospheres of Earth, Venus, and Mars
Abstract Because the solar radiation and particle environment plays a major role in all atmospheric processes such as ionization, dissociation, heating of the upper atmospheres, and thermal and
The effect of tidal locking on the magnetospheric and atmospheric evolution of ``Hot Jupiters''
We study the interaction between the planetary magnetosphere and atmosphere of the close-in extrasolar planets HD 209458b and OGLE-TR-56b with the stellar wind during the evolution of their host
Some global features of palaeointensity in geological time
SUMMARY A global palaeointensity data base was constructed from all published data from volcanic rocks in geological time older than 0.03 Ma. The data base contains a total of 1123 flow mean data
Coronal Evolution of the Sun in Time: High-Resolution X-Ray Spectroscopy of Solar Analogs with Different Ages
We investigate the long-term evolution of X-ray coronae of solar analogs based on high-resolution X-ray spectroscopy and photometry with XMM-Newton. Six nearby main-sequence G stars with ages between
Atmospheric Escape and Evolution of Terrestrial Planets and Satellites
The origin and evolution of Venus’, Earth’s, Mars’ and Titan’s atmospheres are discussed from the time when the active young Sun arrived at the Zero-Age-Main-Sequence. We show that the high EUV flux
THE PALEOMAGNETISM OF SINGLE SILICATE CRYSTALS: RECORDING GEOMAGNETIC FIELD STRENGTH DURING MIXED POLARITY INTERVALS, SUPERCHRONS, AND INNER CORE GROWTH
The basic features of the geomagnetic reversal chronology of the last 160 million years are well established. The relationship between this history and other features of the field, however, has been
Dipole strength and variation of the time-averaged reversing and nonreversing geodynamo based on Thellier analyses of single plagioclase crystals
[1] Single plagioclase crystals separated from lavas can contain minute magnetic inclusions that faithfully record the geomagnetic field, while the silicate host limits natural and experimentally
...
1
2
3
4
5
...