Dependence of the duration of geomagnetic polarity reversals on site latitude

@article{Clement2004DependenceOT,
  title={Dependence of the duration of geomagnetic polarity reversals on site latitude},
  author={Bradford M. Clement},
  journal={Nature},
  year={2004},
  volume={428},
  pages={637-640}
}
An important constraint on the processes governing the geodynamo—the flow in the outer core responsible for generating Earth's magnetic field—is the duration of geomagnetic polarity reversals; that is, how long it takes for Earth's magnetic field to reverse. It is generally accepted that Earth's magnetic field strength drops to low levels during polarity reversals, and the field direction progresses through a 180° change while the field is weak. The time it takes for this process to happen… 

Figures and Tables from this paper

Structural and temporal requirements for geomagnetic field reversal deduced from lava flows
TLDR
Data support the claim that complete reversals require a significant period for magnetic flux to escape from the solid inner core and sufficiently weaken its stabilizing effect.
Dynamical similarity of geomagnetic field reversals
TLDR
It is inferred that the reversal process has remained unchanged, with the same time constants and durations, at least since 180 million years ago, and it is proposed that the reversing field is characterized by three successive phases: a precursory event, a 180° polarity switch and a rebound.
Is Earth's magnetic field reversing?
Deciphering records of geomagnetic reversals
TLDR
The fidelity of the signal extracted from paleomagnetic records is discussed in detail and special attention is paid to their resolution with respect to the timing and mechanisms involved in the magnetization process.
Fast Directional Changes during Geomagnetic Transitions: Global Reversals or Local Fluctuations?
Paleomagnetic investigations from sediments in Central and Southern Italy found directional changes of the order of 10∘ per year during the last geomagnetic field reversal (which took place about
Ionospheric Conductance Spatial Distribution During Geomagnetic Field Reversals
The conductivity of the ionosphere is extremely important in geophysical processes and plays a critical role in magnetosphere‐ionosphere‐thermosphere coupling. Understanding its nature is essential
5.10 – Geomagnetic Excursions
  • C. Laj
  • Environmental Science, Geography
  • 2007
Spitze Angle Changes during Rapid Geomagnetic Core Field Variation
The spitze phenomenon is an outstanding feature of electromagnetic wave propagation through the ionosphere. It consists in a ray path cusp that occurs between vertical propagation and a critical
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 32 REFERENCES
Geomagnetic polarity transitions
The top of Earth's liquid outer core is nearly 2900 km beneath Earth's surface, so we will never be able to observe it directly. This hot, dense, molten iron‐rich body is continuously in motion and
An examination of simulated geomagnetic reversals from a palaeomagnetic perspective
  • R. Coe, L. Hongre, G. Glatzmaier
  • Physics
    Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences
  • 2000
Four magnetic polarity reversals that occurred during two numerical simulations of the Glatzmaier–Roberts geodynamo display a range of behaviour that resembles records of real reversals of the
The last two geomagnetic polarity reversals recorded in high-deposition-rate sediment drifts
High-resolution records of geomagnetic polarity transitions are rare owing to the difficulty of preserving in the geological record details of a process with a duration of only a few thousand years.
Non-axisymmetric behaviour of Olduvai and Jaramillo polarity transitions recorded in north-central Pacific deep-sea sediments
The causes of the reversals of the Earth's magnetic field can be investigated by studying the palaeomagnetic record preserved in rocks. A proper documentation of reversal phenomena should yield
Latitudinal dependency of geomagnetic polarity transition durations
Palaeomagnetic records of the Matuyama–Brunhes polarity transition were obtained from seven, low sedimentation rate, deep-sea cores from the Pacific Ocean. The cores were taken near the 180° meridian
The zonal harmonic model of polarity transitions: A test using successive reversals
A recently developed zonal model for the last geomagnetic field reversal, which describes time- and latitude-dependent transitional behavior of intensity and inclination in terms of dominance of
A detailed record of the Lower Jaramillo Polarity Transition from a southern hemisphere, deep‐sea sediment core
A detailed record of the lower Jaramillo (reversed to normal) polarity transition was obtained from a southern hemisphere, deep-sea sediment core (latitude = 35.91°E, longitude = 59.97°E) The record
Orbital Influence on Earth's Magnetic Field: 100,000-Year Periodicity in Inclination
TLDR
A model in which the strength of the geocentric axial dipole field varies with 100,000-year periodicity, whereas persistent nondipole components do not is proposed, which suggests that the magnetic field is modulated by orbital eccentricity.
...
1
2
3
4
...