Articles tagged with Geomagnetism
A team of researchers applied adaptive-bandwidth kernel density estimation to analyze the latest reversal timing dataset, revealing four distinct dips in the new reversal frequency model following the Cretaceous Normal Superchron. This suggests that short-time-interval geomagnetic reversals may be missing from the compiled record.
A new theory suggests that water accumulated in the mantle caused an overturn, supplying materials for continent formation and strengthening the geodynamo. This event accelerated core cooling, correlating with high paleointensities in Archean rocks.
Scientists have discovered that ancient Earth magnetic field reversals lasted up to 70,000 years, revealing a new perspective on the geomagnetic phenomenon. This extended reversal period had significant impacts on atmospheric chemistry, climate processes, and the evolution of living organisms.
Scientists at NJIT's Center for Solar-Terrestrial Research tracked the impact of recent X-class solar flares on Earth's upper atmosphere. The flares triggered radio blackouts across Africa and Europe, producing auroras that reached unusually low latitudes, including as far south as Florida.
Researchers have identified a tiny 'GPS' system in ancient magnetic fossils, suggesting that animals may have used the Earth's magnetic field to navigate long distances for at least 97 million years. The discovery provides direct evidence of magnetoreception and sheds light on how animals evolved this ability.
The study found that the SAA proton flux center has been drifting westward and northward over five years, with lower-energy protons responding faster to geomagnetic inhomogeneity. The CSES satellite data also showed a significant decrease in the area of the SAA proton flux between 2019 and 2024, correlated with solar activity.
The Chinese Meridian Project study found a dramatic 98% reduction in ionospheric electron density during the May 10-12 super geomagnetic storm, leading to complete loss of ionospheric backscatter echoes. The team also observed significant hemispheric asymmetry, with enhanced electron density in the Southern Hemisphere.
Researchers used large-scale simulations to reproduce near-Earth space environment, confirming opposite charge polarities between regions. Plasma motion explains the reversal in equatorial plane.
A team of geophysicists from ETH Zurich and SUSTech, China, used computer models to simulate whether a completely liquid core could generate a stable magnetic field. Their simulations showed that the Earth's magnetic field was generated in the early history of the Earth in a similar way to today.
Researchers propose using soft X-rays to measure reconnection rates and monitor space weather. By analyzing bright X-ray features, they calculated a global reconnection rate of 0.13, closely matching theoretical predictions.
A new semi-empirical model simulates the Dst index by integrating empirical methods with global magnetohydrodynamic (MHD) models of Earth’s magnetosphere. The model outperforms traditional approaches in accuracy while retaining computational efficiency, demonstrating robustness in capturing timing and magnitude of Dst variations.
Researchers found that ancient Homo sapiens used tailored clothing and ochre-based sunscreens to protect themselves from harmful UV light during the Laschamps excursion. This period of reduced magnetic field strength allowed more cosmic radiation to reach Earth's surface, potentially contributing to the decline of Neanderthals.
A new study from the University of Texas Institute for Geophysics suggests that Mars' molten core could explain its unusual magnetic field. Researchers used computer simulations to model a fully liquid core and found that it could produce a one-sided magnetic field, matching the imprint seen today.
Dr Sanja Panovska has been awarded an ERC Consolidator Grant for her EXCURSION project, which aims to develop the first data-based model of the Earth's magnetic field over the last 780,000 years. The project will investigate geomagnetic excursions and their impact on technological infrastructure, environment, and climate.
A uniquely powerful geomagnetic storm led to unprecedented changes in the upper atmosphere, including location and spread of particles, composition, and temperature. These changes may pose significant risks to satellites and GPS systems, as well as impact navigation and communication technologies.
Researchers estimate that between 280 to 360 meteorites strike Mars each year, forming impact craters greater than 8 meters across. The study uses seismic data from the NASA InSight Mission to make this estimate, which is five times higher than previously thought.
A study found that migratory bats are sensitive to the angle of magnetic inclination and use it for navigation. The soprano pipistrelle bat species calibrated its internal compass at sunset, taking into account both the horizontal component and inclination of the Earth's magnetic field.
Researchers found that space weather events can trigger 'wrong side' failures in rail signalling systems, which are more hazardous than 'right side' failures. This study highlights the need for the industry to consider the risks of space weather and explore mitigation strategies.
Researchers used seismic data to locate and identify a thin layer of molten silicates overlying Mars' metallic core. The discovery reveals a denser and smaller Martian core, aligning with other geophysical data and analysis of Martian meteorites. This finding provides new insights into how Mars formed, evolved, and became a barren planet.
Scientists have found that magnetic contamination in lunar samples can be easily removed using standard techniques, disproving previous theories. The study's findings suggest that paleomagnetism is a powerful tool for understanding core processes and planetary evolution, enabling the long-term preservation of atmospheres.
Researchers used data from NASA's Parker Solar Probe to explain how the solar wind surpasses speeds of 1 million miles per hour. The energy released from the magnetic field near the sun's surface drives the fast solar wind, comprising ionized particles flowing outward from the sun.
Researchers used NASA InSight data to directly measure Mars' core properties, finding a completely liquid iron-alloy core with high percentages of sulfur and oxygen. This discovery provides new insights into Martian formation and geological differences between Earth and Mars, potentially impacting planetary habitability.
A team from Johannes Gutenberg University Mainz discovered a settlement adjacent to the caliph's palace, showing it was inhabited by Christians or Jews before its construction. The excavation revealed ancient mosaics, a water cistern, and stone structures made of basalt, providing new insights into the area's history.
A novel three-dimensional model of the fluid stored deep in Earth's crust along the Cascadia Subduction Zone provides new insight into how the accumulation and release of those fluids may influence seismic activity. The study's findings have applications for increasing understanding of seismic activity along the Cascadia Subduction Zone.
Researchers analyzed rock samples from Eastern Scotland to measure the strength of the geomagnetic field during key time periods. They found that between 332 and 416 million years ago, the field was less than a quarter of its current strength.