Top Tweets for #rotationspeed

12 days ago

What causes the slight #changes in #Earth's #rotationspeed that lead to minor fluctuations in the length of days? Earth consists of a solid #innercore, composed primarily of iron, situated within a liquid #outercore. The inner and outer #mantle layers are made of silicate #rock. The inner core is free to #rotate within the liquid outer core. According to authors H. Zhang and M. Dumberry (2026), this gives rise to complex #interactions between #forces acting on the core and mantle, resulting in minute variations in day lengths, on the order of just a few milliseconds. Essentially, the authors identified a tug-of-war between forces influencing Earth's rotation. Three types of forces have longer been recognized as significant. A mechanical torque arises when the liquid outer core pushes against protrusions in the inner mantle (core-mantle-boundary). Another force is also generated by the #flow of the outer core; this flow creates a magnetic field that attracts iron-rich components of the mantle, thereby producing an #electromagnetictorque. The third force is related to #gravity, causing particularly dense regions within the inner core to be drawn toward especially dense areas of the mantle. The researchers mentioned above used a #model to determine which of the forces involved is dominant and how the three forces interact. They found that the #gravitationalforce is the dominant factor, while the other forces counteract this effect, creating a sort of tug-of-war between them. The models used by the authors to analyze the force interactions between Earth's core and mantle "also point to a low-#viscosity inner core that deforms within a few years." To reconstruct the balance of forces within Earth's interior, the authors utilized, among other sources, #seismicdata from #earthquakes; this data had previously been used to determine the inner core's rotational speed relative to the rest of the planet. © #StefanF.Wirth, September 2026, Berlin Please support my science communication and illustration work with a small contribution. My freelance livelihood depends heavily on this: Ko-fi 👇 link in my first reply. #Reference: H. Zhang & M. Dumberry (2026) in #Nature: DOI: 10.1038/s41586-026-10999-2 👇 link in my first reply. #Illustrations: © Stefan F. Wirth; AI-assisted artistic illustrations based on my hand-drawn sketches, manually edited; September 2026, Berlin. The illustrations offer views into the inner layers of our planet.

wirthstef's tweet photo. What causes the slight #changes in #Earth's #rotationspeed that lead to minor fluctuations in the length of days?

Earth consists of a solid #innercore, composed primarily of iron, situated within a liquid #outercore. The inner and outer #mantle layers are made of silicate #rock.
The inner core is free to #rotate within the liquid outer core. According to authors H. Zhang and M. Dumberry (2026), this gives rise to complex #interactions between #forces acting on the core and mantle, resulting in minute variations in day lengths, on the order of just a few milliseconds.

Essentially, the authors identified a tug-of-war between forces influencing Earth's rotation. Three types of forces have longer been recognized as significant. A mechanical torque arises when the liquid outer core pushes against protrusions in the inner mantle (core-mantle-boundary). Another force is also generated by the #flow of the outer core; this flow creates a magnetic field that attracts iron-rich components of the mantle, thereby producing an #electromagnetictorque. The third force is related to #gravity, causing particularly dense regions within the inner core to be drawn toward especially dense areas of the mantle.

The researchers mentioned above used a #model to determine which of the forces involved is dominant and how the three forces interact. They found that the #gravitationalforce is the dominant factor, while the other forces counteract this effect, creating a sort of tug-of-war between them.
The models used by the authors to analyze the force interactions between Earth's core and mantle "also point to a low-#viscosity inner core that deforms within a few years."
To reconstruct the balance of forces within Earth's interior, the authors utilized, among other sources, #seismicdata from #earthquakes; this data had previously been used to determine the inner core's rotational speed relative to the rest of the planet.

© #StefanF.Wirth, September 2026, Berlin

Please support my science communication and illustration work with a small contribution. My freelance livelihood depends heavily on this: Ko-fi 👇 link in my first reply.

#Reference:
H. Zhang & M. Dumberry (2026) in #Nature:
DOI: 10.1038/s41586-026-10999-2 👇 link in my first reply.

#Illustrations:
© Stefan F. Wirth; AI-assisted artistic illustrations based on my hand-drawn sketches, manually edited; September 2026, Berlin.
The illustrations offer views into the inner layers of our planet.

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Dainik Bhaskar

@DainikBhaskar

about 1 year ago

9 जुलाई 2025, यानी आज का दिन सामान्य दिनों के मुकाबले 1.3 से 1.51 मिली सेकेंड पहले खत्म होगा। इसे इतिहास का सबसे छोटा दिन माना जा सकता है। #Earth #RotationSpeed पढ़ें पूरी खबर- https://t.co/LzRg4kethz

Persperence Envision @Persperence

over 2 years ago

According to data from the International Earth Rotation and Reference Systems Service (IERS), the average length of a day increased in 2023 for the first time in seven years. #Earth #IERS #RotationSpeed #Sciences #research #technology #coherence

Persperence's tweet photo. According to data from the International Earth Rotation and Reference Systems Service (IERS), the average length of a day increased in 2023 for the first time in seven years.

#Earth #IERS #RotationSpeed #Sciences #research #technology #coherence https://t.co/3RHN0yaqNb

Juan Velarde 26 @JuanVelarde26

about 6 years ago · Madrid

Este maquinón tiene un régimen de alabeo de 420 grados/seg. Bestial como gira el #extra330lx ! . @box_repsol hamiltonwatch simloc_fs . #pilot #speed #rotationspeed #motorsport #motor #racing #races #aerobatics… https://t.co/qoWlDMqbQx

Mkanaani 🇮🇱🇹🇿

@Mkanaani_

over 6 years ago

Wengine kazi zao wanasimama masaa 12 kila siku ! Hakuna kiti wala AC, mvua na jua vyote vyetu lakini Mungu atupae amani life inasonga 💪 #RotationSpeed #FeedDown #HoldBack #EasyMixer #DrillOilGass #DrillJob #MichiroMikubwa Breaking Ground, Building Trust

Letizia Davoli 🚀

@letiziadavoli

over 6 years ago

Sempre una figata! #rotationspeed #planets

Maxime Duprez @maximaxoo

almost 7 years ago

#Space: the #exoplanet #BetaPictoris b. "And yet it moves" — equatorial #RotationSpeed of 100,000 kilometres/hour, much #faster than any planet in the Solar System ► https://t.co/2ZKilSLLqo via @CosmicDiaryBlog

maximaxoo's tweet photo. #Space: the #exoplanet #BetaPictoris b. "And yet it moves" — equatorial #RotationSpeed of 100,000 kilometres/hour, much #faster than any planet in the Solar System
► https://t.co/2ZKilSLLqo via @CosmicDiaryBlog https://t.co/p9SxSg8vwG

Everything Serious @NothingSirius

almost 10 years ago

@macusek @mode23 #TellMeAboutIt😂 #BallEarthFails the #LogicTest at even #rotationspeed 360°#BallEarth #solstices #DoNotAddUp #FakeBallEarth

NothingSirius's tweet photo. @macusek @mode23 #TellMeAboutIt😂 #BallEarthFails the #LogicTest at even #rotationspeed 360°#BallEarth #solstices #DoNotAddUp #FakeBallEarth https://t.co/3FUppYPivZ

Heather Archuletta @Pillownaut

about 11 years ago

Astroquizzical: http://t.co/qqvF3EIpuL Why do [a small fraction of] galaxies have two spiral arms? #RotationSpeed #DensityWaveTheory

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