All articles tagged with #geomagnetism
German researchers found iron-rich macrophages in pigeons’ liver detect Earth’s magnetic field and guide navigation; removing these cells disrupts the birds’ sense of direction in cloudy weather, while they can still use the sun on clear days, providing a physical basis for geomagnetic sensing and suggesting multiple cues may guide long-distance navigation.
A study using satellite data from Swarm, CryoSat, CHAMP and Ørsted shows a broad region of iron-rich fluid in Earth's outer core beneath the equatorial Pacific reversed its flow from westward to eastward in 2010, challenging the view of steady westward drift and prompting questions about the core's dynamics and its link to geomagnetic changes. Ongoing monitoring will determine whether this is a short-term wobble, part of a cycle, or a new stable state; while not dangerous itself, such deep interior shifts can influence Earth's magnetic field and technology that relies on it.
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.
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.
Seismic data and geodynamo simulations indicate two hot “Blob” regions at the core–mantle boundary heat the surrounding mantle less evenly, insulating the outer core and shaping long-lived, longitudinal magnetic-field patterns, helping explain Earth's magnetic stability over hundreds of millions of years.
Researchers converted ESA Swarm satellite data and geological records into sound to recreate the Laschamps geomagnetic reversal (~41,000 years ago), when Earth's magnetic field weakened to about 5% of its current strength, potentially increasing cosmic radiation and affecting climate and early human life; the eerie audio illustrates chaotic magnetic shifts and underscores current concerns about weakening regions like the South Atlantic Anomaly.
Scientists reconstructed the Laschamps magnetic reversal (about 41,000 years ago) by merging ESA’s Swarm satellite data with geomagnetic records, turning the upheaval into an eerie audio track that suggests the field briefly weakened to around 5% of its current strength for about 440 years. The work, highlighted by DTU and GFZ researchers and published in 2024, underscores the importance of understanding past extreme geomagnetic events to anticipate future space weather and environmental effects, especially amid ongoing pole drift and the South Atlantic Anomaly.
Scientists used ESA’s Swarm satellite data to turn the 41,000-year-old Laschamps magnetic reversal into an eerie audio track, illustrating a dramatic field flip when the magnetosphere weakened by roughly 5–25% of its current strength over about 250 years and remained abnormally oriented for around 440 years. The event increased cosmic-ray exposure, leaving isotopic fingerprints like higher beryllium-10 and potentially impacting climate and megafauna; ongoing Swarm measurements aim to better predict future geomagnetic fluctuations.
A significant and growing weak spot in Earth's magnetic field, known as the South Atlantic Anomaly, has expanded since 2014, posing risks to satellites and spacecraft. This growth is linked to complex flux patterns at Earth's outer core, with changes also observed over Canada and Siberia, indicating ongoing shifts in Earth's magnetic dynamics.
The magnetic North Pole is moving towards Russia at an unprecedented speed, raising concerns about its impact on navigation systems and technology. This rapid shift, influenced by changes in Earth's molten core and solar interactions, could disrupt devices reliant on magnetic orientation. Scientists are monitoring the situation closely, as it may also indicate a potential magnetic pole reversal, which could expose Earth to increased cosmic radiation. Efforts are underway to update navigation models and understand the underlying geodynamic processes.
The Earth's magnetic North Pole is moving from northern Canada towards Russia at an unprecedented speed, which could impact smartphone navigation systems. This movement is due to changes in the Earth's molten iron core and is part of a natural process that has seen nearly 200 pole switches in the last 100 million years. The World Magnetic Model, used in various technologies, helps adjust for these changes to maintain accurate navigation.
The magnetic North Pole is moving towards Russia at an unprecedented rate, having accelerated from 10-15 km per year to 55 km per year in the early 2000s, before slowing to 25 km per year recently. This movement is driven by unpredictable fluctuations in the Earth's molten iron core, which generates the planet's magnetic field. The British Geological Survey, in collaboration with the US National Oceanic and Atmospheric Administration, monitors these changes using the World Magnetic Model, which is crucial for navigation technologies like GPS and military systems.