Results 11 to 20 of about 6,666 (172)

Radiometric Constraints on the Timing, Tempo, and Effects of Large Igneous Province Emplacement

open access: yesGeophysical Monograph Series, Page 27-82., 2021

Exploring the links between Large Igneous Provinces and dramatic environmental impact

An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Jennifer Kasbohm   +2 more
wiley  

+2 more sources

Geomagnetic Dipole Changes and Upwelling/Downwelling at the Top of the Earth's Core

open access: yesFrontiers in Earth Science, 2018
The convective state of the top of Earth's outer core is still under debate. Conflicting evidence from seismology and geomagnetism provides arguments for and against a thick stably stratified layer below the core-mantle boundary.
Ludovic Huguet   +3 more
doaj   +1 more source

A secular variation candidate model for IGRF-13 based on Swarm data and ensemble inverse geodynamo modelling

open access: yesEarth, Planets and Space, 2021
This paper describes the design of a candidate secular variation model for the 13th generation of the International Geomagnetic Reference Field. This candidate is based upon the integration of an ensemble of 100 numerical models of the geodynamo between ...
Alexandre Fournier   +3 more
doaj   +1 more source

Dynamic mode decomposition of the geomagnetic field over the last two decades

open access: yesEarth and Planetary Physics, 2023
Earth's magnetic field, which is generated in the liquid outer core through the dynamo action, undergoes changes on timescales of a few years to several million years, yet the underlying mechanisms responsible for the field variations remain to be ...
JuYuan Xu, YuFeng Lin
doaj   +1 more source

Free core nutation: new large disturbance and connection evidence with geomagnetic jerks [PDF]

open access: yes, 2015
Variations in free core nutation (FCN) are connected with various processes in the Earth's fluid core and core-mantle coupling, which are also largely responsible for the geomagnetic field variations, particularly the geomagnetic jerks (GMJs). A previous
Malkin, Zinovy
core   +2 more sources

Studying diurnal and secular variations of the Earth's magnetic field using data from Yangibazar magnetic observatory (Uzbekistan)

open access: yesRussian Journal of Earth Sciences, 2022
The article provides information about the Yangibazar geomagnetic observatory, managed by the Institute of Seismology of the Academy of Sciences of the Republic of Uzbekistan.
Yusupov Valizhon   +2 more
doaj   +1 more source

South Atlantic Anomaly Areal Extent as a Possible Indicator of Geomagnetic Jerks in the Satellite Era

open access: yesFrontiers in Earth Science, 2021
Geomagnetic jerks are sudden changes in the geomagnetic field secular variation related to changes in outer core flow patterns. Finding geophysical phenomena related to geomagnetic jerks provides a vital contribution to better understand the geomagnetic ...
S. A. Campuzano   +6 more
doaj   +1 more source

Long-Term Seafloor Electromagnetic Observation in the Northwest Pacific May Detect the Vector Geomagnetic Secular Variation

open access: yesData Science Journal, 2010
Sea Floor ElectroMagnetic Stations (SFEMSs) are now operating at two deep seafloor sites called the 'WPB' and the 'NWP' in the West Philippine Basin and the Northwest Pacific Basin, respectively.
H Toh, Y Hamano, T Goto, H Utada
doaj   +1 more source

Evidence for a geomagnetic jerk in 1990 across Europe

open access: yesAnnals of Geophysics, 1995
The analysis of geomagnetic data from magnetic observatories demonstrated the existence of very rapid changes, or jerks, in the secular variation, especially the occurrence of the well known geomagnetic jerks of 1969 and 1978.
A. Meloni, L. Cafarella
doaj   +1 more source

After some 350 years – zero declination again in Paris [PDF]

open access: yesHistory of Geo- and Space Sciences, 2016
The main part of the geomagnetic field – produced by a dynamo process in the Earth's outer core – changes its direction and strength in time, over timescales from months to centuries, even millennia.
M. Mandea, J.-L. Le Mouël
doaj   +1 more source

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