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Geodynamo

All articles tagged with #geodynamo

Pacific Core-Flow Reversal Signals a More Dynamic Geodynamo
earth-science5 days ago

Pacific Core-Flow Reversal Signals a More Dynamic Geodynamo

A broad region of liquid iron beneath the equatorial Pacific flipped from westward to eastward flow around 2010, revealing the outer core can change circulation more abruptly than previously thought. Using nearly 30 years of data from ground observatories plus ESA Swarm, CryoSat, CHAMP and Ørsted satellites, researchers traced how this flow reversal reshapes our view of the geodynamo and Earth's magnetic field. The finding raises questions about core–mantle–inner-core interactions and whether such reversals are temporary fluctuations or part of a longer cycle, underscoring the need for ongoing monitoring.

via SciTechDaily|
#earth-science#geodynamo#magnetic-field
Pacific Core Flow Reversal Reveals Dynamic Earth
science1 month ago

Pacific Core Flow Reversal Reveals Dynamic Earth

Satellite data from 1997–2025 show a portion of Earth's outer core beneath the Pacific reversed its flow from westward to eastward between 2010 and 2012, strengthening through 2020 before weakening again and accounting for about 5% of the outer-core surface flow. This hints that the deep interior is more dynamic than previously thought and may be linked to later geomagnetic jerks; improving our understanding of the geodynamo helps forecast the magnetic field and space weather.

via ScienceAlert|
#earth-science#geodynamo#geomagnetism
Pacific Core Flow Reverses, Revealing a Dynamic Geodynamo
science1 month ago

Pacific Core Flow Reverses, Revealing a Dynamic Geodynamo

ESA satellites detected a sudden reversal of flow in Earth's liquid outer core beneath the Pacific in 2010, showing the core is more variable than once believed and offering new insights into the geodynamo that sustains Earth’s magnetic field; scientists will monitor whether this is a temporary fluctuation, part of a cycle, or a new stable state with potential impacts on navigation and space weather models.

via Indian Defence Review|
#earths-core#esa-swarm#geodynamo
Ancient Geomagnetic Reversals Were Longer and Messier Than Thought
science4 months ago

Ancient Geomagnetic Reversals Were Longer and Messier Than Thought

A Newfoundland sediment core reveals two magnetic polarity reversals around 40 million years ago lasting about 18,000 and 70,000 years, far longer and more variable than the commonly cited ~10,000-year reversals. The findings suggest reversals are chaotic and driven by the Earth's geodynamo in the outer core, implying future reversals could last tens of thousands of years and may increase exposure to cosmic radiation with potential climate and biological impacts.

via ScienceAlert|
#brunhes-matuyama#earths-core#geodynamo
Deep Mantle Giants Have Shaped Earth’s Magnetic Field for Millions of Years
science5 months ago

Deep Mantle Giants Have Shaped Earth’s Magnetic Field for Millions of Years

Geologists report that two massive, buried mantle anomalies called large low-shear-velocity provinces (LLSVPs) have modulated Earth's magnetic field for about 265 million years by creating temperature- and density-driven flow differences that alter the outer-core liquid iron; computer simulations show only models including LLSVPs reproduce observed magnetic irregularities, with implications for ancient continental configurations and climate.

via WIRED|
#geodynamo#llsvps#magnetic-field
Weakening Earth's Magnetic Field and Clues from Ancient Crystals
science11 months ago

Weakening Earth's Magnetic Field and Clues from Ancient Crystals

Ancient artifacts containing magnetic minerals reveal past fluctuations in Earth's magnetic field, including a significant anomaly from 3,000 years ago, which could help scientists better understand the current weakening of the magnetic field and its future implications, especially for satellite technology and space radiation protection.

via Live Science|
#archaeomagnetism#earths-magnetic-field#geodynamo
Unprecedented Shift: Magnetic North Pole Drifts Toward Russia
science1 year ago

Unprecedented Shift: Magnetic North Pole Drifts Toward Russia

Earth's magnetic north pole has been moving eastward at an accelerating pace, shifting from Canada towards Siberia due to changes in the flow of liquid metal in Earth's outer core. This movement, driven by the geodynamo system, has increased from 15 kilometers per year to 50-60 kilometers per year since the 1990s. While the shift has minimal immediate impact on daily life, it requires adjustments in navigation systems like GPS. Scientists are monitoring these changes, as Earth's magnetic poles have historically swapped positions every 300,000 years, though the last swap occurred 780,000 years ago.

via IFLScience|
#earth#electromagnetism#geodynamo
Unveiling the Dynamic Dance of Iron Atoms in Earth's Inner Core
science2 years ago

Unveiling the Dynamic Dance of Iron Atoms in Earth's Inner Core

Scientists have discovered that something is moving within the Earth's inner core at a surprisingly rapid pace, aided by machine learning. Researchers believe that groupings of iron atoms in the core can change their locations while preserving the iron's metallic structure, a phenomenon known as collective motion. This finding could help explain the softness of the inner core and its role in generating Earth's magnetic field, known as the geodynamo. The study provides insights into the dynamic processes and evolution of the Earth's inner core.

via The Debrief|
#collective-motion#earths-inner-core#geodynamo
"Dynamic Discovery: Iron Atoms in Earth's Inner Core on the Move"
science2 years ago

"Dynamic Discovery: Iron Atoms in Earth's Inner Core on the Move"

Researchers from The University of Texas at Austin and collaborators in China have discovered that iron atoms in the Earth's solid inner core are capable of rapid movement, known as "collective motion," while maintaining the metallic structure of the iron. This finding could help explain various properties of the inner core and shed light on the role it plays in generating Earth's magnetic field. By re-creating the inner core in the lab and using an AI algorithm, the scientists observed groups of atoms changing places while still maintaining the overall hexagonal structure. The increased movement of the iron atoms could explain why seismic measurements show the inner core to be softer and more malleable than expected. Understanding the atomic-scale activity in the inner core can inform future research on energy generation and the dynamics of Earth's core.

via Phys.org|
#collective-motion#earths-inner-core#geodynamo
Unraveling Earth's Magnetic Poles: The Fascinating Explanation
science2 years ago

Unraveling Earth's Magnetic Poles: The Fascinating Explanation

Earth's magnetic poles are generated by the convection of the molten metal outer core surrounding the solid inner core, which creates a magnetic field known as the geodynamo. This magnetic field acts as a protective envelope, deflecting dangerous solar radiation and shielding the planet from harm. However, irregular patterns in the magnetic field, such as the South Atlantic Anomaly, can weaken the magnetosphere, potentially leading to increased radiation exposure and disruptions to satellites and communication systems. The Earth's magnetic poles also undergo periodic reversals, with the last complete reversal occurring about 780,000 years ago. While some researchers suggest that a pole reversal may be imminent, others believe it is not. Studying the Earth's interior and paleogeomagnetic record can help us understand the complex relationship between the magnetosphere and life on Earth.

via Livescience.com|
#earth#geodynamo#magnetic-poles
Magnetic North Pole Rapidly Shifts Towards Siberia.
science3 years ago

Magnetic North Pole Rapidly Shifts Towards Siberia.

The Earth's magnetic north pole is moving towards Siberia at an unprecedented and unpredictable rate, with experts suggesting it could reach the region by the middle of the century. The movement of the magnetic north pole is caused by the Earth's liquid outer core, which generates the planet's magnetic field. The north dip pole has been moving primarily in the same direction since 1831, but its speed has increased significantly since the 1990s. However, scientists cannot reliably predict the movement of the magnetic poles beyond a few years, so it is uncertain whether the north dip pole will reach Siberia or change course.

via Newsweek|
#earths-magnetic-north-pole#geodynamo#geomagnetic-poles