Results 21 to 30 of about 329,822 (248)

Solar Magnetic Field Reversals and the Role of Dynamo Families [PDF]

, 2012
The variable magnetic field of the solar photosphere exhibits periodic reversals as a result of dynamo activity occurring within the solar interior. We decompose the surface field as observed by both the Wilcox Solar Observatory and the Michelson Doppler
A. S. Brun, Abramowitz, Alexakis, Basu, Browning, Brun, Böhm-Vitense, Cattaneo, Charbonneau, Choudhuri, Dikpati, Dikpati, Dikpati, Guckenheimer, Hoeksema, J. T. Hoeksema, Karak, Knobloch, M. L. DeRosa, Melbourne, Moffatt, Pétrélis, Racine, Reiners, Reiners, Ribes, Roberts, Ruzmaikin, Saar, Schrijver, Stenflo, Strugarek, Tobias, Valet, Yeates   +34 more
core   +3 more sources

Two Records of Relative Paleointensity for the Past 4 Myr

Frontiers in Earth Science, 2020
We performed new high-resolution magnetic measurements of sedimentary cores from the east northern Pacific ODP Site 1021 and the East equatorial Pacific ODP Site 851.
Jean-Pierre Valet, Anojh Thevarasan, Franck Bassinot, Tatiana Savranskaia, Naoufel Haddam   +4 more
doaj   +1 more source

A new inclination-based method to evaluate the global geomagnetic configuration and axial dipole moment

Earth and Planetary Physics, 2022
The strength and configuration of the geomagnetic field control the average shape of the magnetosphere. The pure dipole assumption and the virtual dipole moment (VDM), determined by individual records, have been widely adopted to evaluate the strength of
KaiHua Xu, Fei He, Yong Wei, Ross N. Mitchell, Si Chen, YuQi Wang, ZhaoJin Rong   +6 more
doaj   +1 more source

The Cretaceous Normal Superchron: A Mini-Review of Its Discovery, Short Reversal Events, Paleointensity, Paleosecular Variations, Paleoenvironment, Volcanism, and Mechanism

Frontiers in Earth Science, 2022
The Cretaceous Normal Superchron (CNS) was first defined in the 1960s to explain the Cretaceous Quiet Zone in marine magnetic anomaly profiles, which includes no or fewer geomagnetic reversals.
Yutaka Yoshimura
doaj   +1 more source

A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields

Progress in Earth and Planetary Science, 2020
We present a novel paleomagnetic record for the lower Matuyama chronozone, which includes the Réunion subchronozone and the lower Olduvai polarity reversal, from a continuous section of a 168-m-thick on-land marine succession in the southernmost part of ...
Takumi Konishi, Makoto Okada
doaj   +1 more source

Fast Directional Changes during Geomagnetic Transitions: Global Reversals or Local Fluctuations?

Geosciences, 2021
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 780,000 years ago).
Stefano Maffei, Philip W. Livermore, Jon E. Mound, Sam Greenwood, Christopher J. Davies   +4 more
doaj   +1 more source

Variability of Millennial-Scale Trends in the Geomagnetic Axial Dipole [PDF]

, 2019
The historical trend in the axial dipole is sufficient to reverse the field in less than 2 kyr. Assessing the prospect of an imminent polarity reversal depends on the probability of sustaining the historical trend for long enough to produce a reversal ...
Avery, MS, Buffett, B, Davis, W
core   +1 more source

Cosmogenic signature of geomagnetic reversals and excursions from the Réunion event to the Matuyama-Brunhes transition (0.7-2.14 Ma interval)

, 2018
Long-term variations of the geomagnetic dipole moment (GDM) during periods of stable polarity and in transitional states (reversals and excursions) provide key information for understanding the geodynamo regime. Following several studies dealing with the
Q. Simon, Q. Simon, D. Bourlès, N. Thouveny, C. Horng, J. Valet, Franck Bassinot, Sandrine Choy, Sandrine Choy   +8 more
semanticscholar   +1 more source

Domino model for geomagnetic field reversals [PDF]

Physical Review E, 2013
accepted for Physical Review E, 18 December ...
Mori, N., Schmitt, D., Ferriz-Mas, A., Wicht, J., Mouri, H., Nakamichi, A., Morikawa, M.   +6 more
openaire   +3 more sources

New ⁴⁰Ar/³⁹Ar dating of the Grande Ronde lavas, Columbia River Basalts, USA: Implications for duration of flood basalt eruption episodes [PDF]

, 2010
Grande Ronde Basalt (GRB) lavas represent the most voluminous eruptive pulse of the Columbia River-Snake River-Yellowstone hotspot volcanism. With an estimated eruptive volume of 150,000 km3, GRB lavas form at least 66% of the total volume of the ...
Barry, T. L., Hooper, P., Kelley, S. P., Reidel, S., Self, S., Widdowson, M.   +5 more
core   +1 more source