Jupiter was formerly twice its current size, had a much stronger magnetic field

https://phys.org/news/2025-05-jupiter-current-size-stronger-magnetic.html

#HackerNews #Jupiter #SolarSystem #Astronomy #SpaceScience #MagneticField

Spiral Staircases: Unexpected Joy - Annaka Harris on Modern Wisdom

#intuition #orientation #magneticfield #fyp #explore #discover

In 1929, Motonori Matuyama showed evidence that the earth’s magnetic field had reversed polarity in the distant past. Scientists say that we might be on the verge of another reversal. #Poetry #Science #History #PlateTectonics #MagneticField #Matuyama (https://sharpgiving.com/thebookofscience/items/p1929a.html)

Salt Affects Particle Spreading

Microplastics are proliferating in our oceans (and everywhere else). This video takes a look at how salt and salinity gradients could affect the way plastics move. The researchers begin with a liquid bath sandwiched between a bed of magnets and electrodes. Using Lorentz forcing, they create an essentially 2D flow field that is ordered or chaotic, depending on the magnets’ configuration. Although it’s driven very differently, the flow field resembles the way the upper layer of the ocean moves and mixes.

The researchers then introduce colloids (particles that act as an analog for microplastics) and a bit of salt. Depending on the salinity gradient in the bath, the colloids can be attracted to one another or repelled. As the team shows, the resulting spread of colloids depends strongly on these salinity conditions, suggesting that microplastics, too, could see stronger dispersion or trapping depending on salinity changes. (Video and image credit: M. Alipour et al.)

#2024gofm #electrohydrodynamics #flowVisualization #fluidDynamics #geophysics #magneticField #physics #plasticPollution #science #turbulence

Invisibility Cloak for Magnetic Obstacles
https://www.uni-bayreuth.de/en/press-release/invisibility-cloak-physics
#Research #Cloaking #MagneticField #UniBayreuth #UBT

Sea Turtles Dance To Orientate With Earth's Magnetic Field, Study Reveals
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https://www.sciencealert.com/sea-turtles-dance-to-orientate-with-earths-magnetic-field-study-reveals <-- shared technical article
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https://doi.org/10.1038/s41586-024-08554-y <-- shared paper
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#GIS #spatial #mapping #navigation #turtle #seaturtles #global #magnetism #magnetic #Earth #magneticfield #geomagnetism #animals #migration #magnetoreception #turtledance #spatialanalysis #spatiotemporal #migratory #compass #position #geography #magneticmap #magneticcoordinates #destination #magneticsignature #loggerhead #foraging

The Magnetic #NorthPole Has Officially Changed Position
Magnetic north has shifted away from Canada and towards Siberia, a trend that has been ongoing for the last 20 years. While the geographical North Pole stays fixed in place (at the very summit of the Earth's rotational axis), the World Magnetic Model (WMM) pinpoints the magnetic North Pole – where #Earth's #magneticfield points straight down, a perfectly vertical magnetic field.
https://www.sciencealert.com/the-magnetic-north-pole-has-officially-changed-position

#NASA monitoring strange anomaly in #Earth's #magneticfield: a giant region of lower #magnetic intensity in skies above planet, stretching between South America and Africa.
This vast, developing phenomenon, called #SouthAtlanticAnomaly, has intrigued and concerned scientists for years, and perhaps none more so than NASA researchers.
Space agency's #satellites and #spacecraft are vulnerable to weakened magnetic field, and thresulting exposure to charged particles from Sun.
https://www.sciencealert.com/nasa-is-watching-a-vast-growing-anomaly-in-earths-magnetic-field

Rocks from #China's #Moon mission suggest Luna history revision
18 researchers from the Chinese Academy of Sciences, assess #paleointensity – a measure of historical #magneticfield. #Basalt samples thought to be 2.8B years old. Analysis suggests Moon's magnetic field has increased in strength. Moon once possessed a strong "dynamo" – the term for forces that create celestial bodies' magnetic fields – but it weakened around 3.1B years ago and shut down around 1B years ago.
https://www.theregister.com/2024/12/20/chinese_moon_samples_analysis/

Finger Magnet Implant

#magneticfield #sensor #technology #experiment #electric #magnet #AC #AlternatingCurrent

https://www.youtube.com/shorts/17l9BucbXec

Beautiful cover for the new issue of Science Advances

In the feature article, Cai et al. describe the existence of a weak lunar dynamo 2 billion years ago, using mare basalt samples from Oceanus Procellarum at midlatitude, gathered from the Chang’e-5 mission.

https://www.science.org/toc/sciadv/11/1

#Moon #LunarDynamo #LunarMagneticField #physics #dynamo #magneticfield #Astrodon #space #science #STEM

World Magnetic Model 2025 Released [NOAA]
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https://www.ncei.noaa.gov/news/world-magnetic-model-2025-released <-- technical article
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https://www.ncei.noaa.gov/products/world-magnetic-model-high-resolution <-- updated map/data, World Magnetic Model, NOAA
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#GIS #spatial #mapping #navigation #geomagnetic #geology #WMM #worldmagneticmodel #magneticfield #model #spatiotemporal #global #technology #GPS #WMM2025 #highresolution #WMMHR2025

NASA Is Watching a Vast, Growing Anomaly in Earth's Magnetic Field

https://www.scihb.com/2024/12/nasa-is-watching-vast-growing-anomaly.html

#space #astronomy #earthscience #earth #planetaryscience #nasa #magneticfield

✨During the #Christmas season, we often think of #wonders and the invisible🪄 that connects our world. Did you know that scientists are searching for an invisible wonder - but in the #universe? 🌌 #Axions, the promising candidates for Dark Matter (DM)🖤, are ultra-light particles with masses around 10⁻²² eV and wavelengths of about one kiloparsec (~ 3x10¹⁶ km).

Particles with similar properties to axions are called "axion-like particles" (ALPs). 💡ALPs, which include ultra-light axions, can alter #light polarization – meaning the alignment of #lightwaves. During an internship with us, Sarah searched for such phenomena in low-frequency #LOFAR data 📡 from the pulsar PSR J0332+5434. Low frequencies📉 are ideal, as the ionosphere – an electron layer in the Earth's atmosphere 🌍, caused by solar radiation – creates interference that can be removed from low-frequency LOFAR data through calibration.

According to theories, axions apperars in strong magnetic fields, such as in #stellar cores, where they can escape because they interact very weakly with normal matter. Just like DM 🖤.

Similarly, pulsars have extremely strong static magnetic fields. When cosmic ALPs enter a strong #magneticfield, they can be converted into photons – that is, light 🌟 – and thus become detectable, if ultra-light axions exist.

Currently, there are three methods for searching for ALPs:
1️⃣ Helioscopes for solar ALPs (e.g. IAXO, 🖥️ 1) ☀️,
2️⃣ Haloscope searches in the galactic halo 🌌 (e.g. observing radiopulsars, 🖥️ 2), and
3️⃣ Generating ALPs in the lab 🔬 (e.g. ALPS II, @DESY , 🖥️ 3).
© S.Pappert, E.Moerova | MPIfR

A Magnetic Tsunami Warning

Tsunamis are devastating natural disasters that can strike with little to no warning for coastlines. Often the first sign of major tsunami is a drop in the sea level as water flows out to join the incoming wave. But researchers have now shown that magnetic fields can signal a coming wave, too. Because seawater is electrically conductive, its movement affects local magnetic fields, and a tsunami’s signal is large enough to be discernible. One study found that the magnetic field level changes are detectable a full minute before visible changes in the sea level. One minute may not sound like much, but in an evacuation where seconds count, it could make a big difference in saving lives. (Image credit: Jiji Press/AFP/Getty Images; research credit: Z. Lin et al.; via Gizmodo)

#fluidDynamics #geophysics #magneticField #magnetohydrodynamics #physics #science #tsunami

#Einstein’s Last Try to Combine #Gravity and #Electromagnetism : Medium

Boost for #Mars #Life? #RedPlanet's #MagneticField may have lasted longer than thought : Live Sci

Division of labour: #Mitochondria split to meet #Energy demands ($) : Nature

Check our latest #KnowledgeLinks

https://knowledgezone.co.in/resources/bookmarks

Magnetic Displacement Experiment Challenges Long-Held Theories On How Migratory Birds Navigate
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https://phys.org/news/2024-11-magnetic-displacement-held-theories-migratory.html <-- shared technical article
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https://doi.org/10.1098/rspb.2024.1363 <-- shared paper
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#GIS #spatial #mapping #migration #magnetism #geomagnetism #inclination #declination #bird #avian #navigation #biology #ecosystems #migratorybirds #breeding #wintering #reedwarblers #research #experimentation #magneticfield

Our only visit to #Uranus came at an unusual time for the #planet

#Voyager2 flew by Uranus in 1986, giving us our only up-close look at the planet – but unusual #spaceweather just before the craft arrived has given us a misleading idea about the planet’s #magneticfield

https://www.newscientist.com/article/2455695-our-only-visit-to-uranus-came-at-an-unusual-time-for-the-planet/

#Mars could have lived, even without a #magneticfield;
Mars and #Earth were sister #planets in many ways, with early similar conditions. Why did Mars die? The leading explanation isn’t universal.

https://bigthink.com/starts-with-a-bang/mars-live-magnetic-field/

#aurora, #nightsight, #pixel7, #northernlights, #coronalpulse, #plasma, #magneticfield
Last night around 22:00 okanagan valley, western Canada