Results 31 to 40 of about 329,822 (248)

Latitude Dependence of Geomagnetic Paleosecular Variation and its Relation to the Frequency of Magnetic Reversals: Observations From the Cretaceous and Jurassic

Geochemistry Geophysics Geosystems, 2019
Nearly three decades ago paleomagnetists suggested that there existed a clear link between latitude dependence of geomagnetic paleosecular variation (PSV) and reversal frequency.
P. V. Doubrovine, T. Veikkolainen, L. Pesonen, E. Piispa, S. Ots, A. V. Smirnov, E. Kulakov, A. Biggin   +7 more
semanticscholar   +1 more source

Insights into pre-reversal paleosecular variation from stochastic models

Frontiers in Earth Science, 2015
To provide insights on the paleosecular variation of the geomagnetic field and the mechanism of reversals, long time series of the dipolar magnetic moment are generated by two different stochastic models, known as the domino model and the inhomogeneous ...
Klaudio ePeqini, Bejo eDuka, Angelo eDe Santis   +2 more
doaj   +1 more source

Quasi-periodic fractal patterns in geomagnetic reversals, geological activity, and astronomical events

, 2015
The cause of geomagnetic reversals remains a geological mystery. With the availability of improved paleomagnetic databases in the past three years, a reexamination of possible periodicity in the geomagnetic reversal rate seems warranted. Previous reports
Stephen J. Puetz, G. Borchardt
semanticscholar   +1 more source

The clustering of polarity reversals of the geomagnetic field

, 2006
Often in nature the temporal distribution of inhomogeneous stochastic point processes can be modeled as a realization of renewal Poisson processes with a variable rate.
A. Kageyama, A. Vecchio, D. L. Turcotte, D. V. Kent, F. Lepreti, H. K. Moffatt, I. Guerra, J. R. Heirtzler, L. Sorriso-Valvo, P. Harabaglia, P. Veltri, P. L. McFadden, R. Hollerbach, R. T. Merril, S. P. Huestis, T. Rikitake, V. Carbone, W. Feller   +17 more
core   +1 more source

Reversals in nature and the nature of reversals [PDF]

, 2007
The asymmetric shape of reversals of the Earth's magnetic field indicates a possible connection with relaxation oscillations as they were early discussed by van der Pol.
Aubert J, Carbone V, Childress S, Constable C, De Michelis P, F. Stefani, G. Gerbeth, Gailitis A, Gubbins D, Gubbins D, Krause F, L. Sorriso-Valvo, M. Xu, McFadden PL, Meinel R, Merrill RT, Narteau C, Pavlov V, Phillips CG, Pontieri A, Schmidt D, Shcherbakov VP, Sorriso-Valvo L, Stefani F, Stefani F, Stefani F, Stefani F, Stefani F, Tarduno JA, U. Günther, van der Pol B, Weisshaar E, Wicht J, Xu M, Yoshimura H   +34 more
core   +2 more sources

Revisiting the Jurassic Geomagnetic Reversal recorded in the Lesotho Basalt (Southern Africa)

, 2003
We carried out a detailed and continuous paleomagnetic sampling of the reversed to normal geomagnetic transition recorded by some 60 consecutive flow units near the base of the Lesotho Basalt (183  1 Ma).
Camps, Cox, Hoffman, John Thompson, Laj, Liliane Faynot, Michel Prévot, Mireille Perrin, Morgan, Neil Roberts, Pierre Camps, Prévot, Prévot   +12 more
core   +2 more sources

Oxygen escape from the Earth during geomagnetic reversals: Implications to mass extinction

, 2014
The evolution of life is affected by variations of atmospheric oxygen level and geomagnetic field intensity. Oxygen can escape into interplanetary space as ions after gaining momentum from solar wind, but Earth's strong dipole field reduces the momentum ...
Yong Wei, Z. Pu, Q. Zong, W. Wan, Z. Ren, M. Fraenz, E. Dubinin, F. Tian, Q. Shi, S. Fu, M. Hong   +10 more
semanticscholar   +1 more source

An analysis of the fluctuations of the geomagnetic dipole

, 2007
The time evolution of the strength of the Earth's virtual axial dipole moment (VADM) is analyzed by relating it to the Fokker-Planck equation, which describes a random walk with VADM-dependent drift and diffusion coefficients.
Bouligand, Christensen, Constable, G.T. Barkema, Gardiner, Glatzmaier, Guyodo, Hoyng, Hoyng, Hulot, J. Kuipers, K. Brendel, Kuang, Merrill, P. Hoyng, Valet, Van Kampen   +16 more
core   +1 more source

Predictability of Magnetic Field Reversals

Mathematics
Geomagnetic field measurements indicate that at present we may be on the brink of the Earth’s magnetic field reversal, potentially resulting in all the accompanying negative consequences for the mankind.
Daniil Tolmachev, Roman Chertovskih, Simon Ranjith Jeyabalan, Vladislav Zheligovsky   +3 more
doaj   +1 more source

Magnetic field reversals and long-time memory in conducting flows [PDF]

, 2014
Employing a simple ideal magnetohydrodynamic model in spherical geometry,we show that the presence of either rotation or finite magnetic helicity is sufficient to induce dynamical reversals of the magnetic dipole moment.
Dmitruk, P., Matthaeus, W. H., Mininni, P. D., Pouquet, A., Servidio, S.   +4 more
core   +2 more sources