Results 111 to 120 of about 153 (126)

Analysis of the Last Reversal, Last Excursions and important HoloceneAnomalies of the Geomagnetic Field using the Eccentric Dipole and a 360-Dipole Ring Mode

2022
<p>Eccentric dipole can be considered the next approximation of the geomagnetic field after the<br>generally used geocentric dipole. Considering that during reversals, excursions and important<br>anomalies the non-dipole contributions are relevant, we study the evolution of the eccentric<br>dipole
Alicia González-López, Maria Luisa Osete, Saioa A. Campuzano, Pablo Rivera-Pérez, Alberto Molina-Cardín, F. Javier Pavón-Carrasco   +5 more
openaire   +1 more source

A Thick Negative Polarity Anomaly in a Sediment Core From the Central Arctic Ocean: Geomagnetic Excursion Versus Reversal

Journal of Geophysical Research: Solid Earth, 2019
AbstractThere are two distinctly different views on Quaternary sedimentation rates in the central Arctic Ocean, namely, that they were on cm/kyr or on mm/kyr scales, largely as a result of divergent interpretations of magnetic reversal stratigraphy. This study provides new evidence to help resolve this controversy in the form of an almost 1‐m‐thick ...
Jianxing Liu, Xuefa Shi, Yanguang Liu, Qingsong Liu, Yan Liu, Qiang Zhang, Shulan Ge, Jinhua Li   +7 more
openaire   +1 more source

Paleomagnetic and geochronological study of a geomagnetic field reversal or excursion recorded in pliocene volcanic rocks from Georgia (Lesser Caucasus)

Physics of the Earth and Planetary Interiors, 1996
Abstract A 250-m thick volcanic sequence of some 63 Pliocene lava flows from Georgia (Akhalkalaki plateau) which was previously thought to record the Gauss-Matuyama reversal was re-studied in detail. About 400 oriented cores were sampled along four sub-vertical sections partially overlapping each other. At the base of the section, 16 consecutive lava
Camps, Pierre, Ruffet, Gilles, Shcherbakov, Valera, Shcherbakova, Valja, Prévot, Michel, Moussine-Pouchkine, Alexis, Sholpo, Lolij, Goguitchaichvili, Afthandil, Asanidzé, Bejan   +8 more
openaire   +2 more sources

Geomagnetic Field Dynamics During Excursions and Reversals

The geomagnetic field undergoes both long-term and short-term deviations from its predominantly dipolar configuration, expressed as polarity reversals and geomagnetic excursions. These episodes are characterized by significant drops in field intensity and an increase in the paleosecular variation index (PSV index), reflecting changes in the underlying ...
Sunaina Shinu, Ahmed Nasser Mahgoub Ahmed, Monika Korte   +2 more
openaire   +1 more source

BEHAVIOR OF THE GEOMAGNETIC ELD DURING REVERSALS AND EXCURSIONS

Vestnik Moskovskogo Universiteta, Seriya 3: Fizika, Astronomiya
On the basis of the three-dimensional geodynamo model, it is shown that at small amplitudes of heat sources during reversals and excursions of the geomagnetic eld, attenuation of not only the dipole magnetic eld, but also the eld of high harmonics is observed.
openaire   +1 more source

Geomagnetic reversals and excursions as an outcome of non-equilibrium turbulence in the Earth's core

The study of the effect of statistically non-stationary turbulence in the Earth’s outer core on the effective turbulent electromotive force generated by the convectively driven flow of liquid iron reveals very interesting features of the geodynamo process, as non-equilibrium processes in MHD turbulence can lead to Earth-like evolution characteristics ...
openaire   +1 more source

Timing of Quaternary geomagnetic reversals and excursions in volcanic and sedimentary archives

Quaternary Science Reviews, 2020
J E T Channell, Brad S Singer, B R Jicha   +2 more
exaly  

Reversal of drift direction during the Laschamp geomagnetic excursion

Physics of the Earth and Planetary Interiors
Nicole Clizzie, Catherine Constable
openaire   +1 more source

Geomagnetic excursions reflect an aborted polarity state

Earth and Planetary Science Letters, 2008
Jean-Pierre Valet
exaly  

Palaeomagnetic excursions, aborted reversals and transitional fields

Nature, 1981
Kenneth A Hoffman
exaly