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Part of situation: Earth inner core deformation and rotation speed (2 clusters)

Earth's inner core deformation affects day length

Earth's inner core planetary rotation geophysics angular momentum Nature study

A new study published in the journal Nature reveals that the Earth's solid inner core undergoes a deformation process every 70 years, which directly impacts the length of the planet's day.

Physicists Huifeng Zhang and Mathieu Dumberry from the University of Alberta found that the inner core is slightly elliptical. As this massive metal body oscillates like a pendulum, its mass shifts relative to irregularities in the Earth's mantle. This movement triggers an exchange of angular momentum, similar to a figure skater changing rotation speed by moving their arms.

The resulting gravitational fields and electromagnetic frictional forces exert continuous pressure on the mantle, regulating the speed of the Earth's rotation and causing the day to fluctuate by milliseconds.

Entities

Huifeng Zhang · Mathieu Dumberry · Nature · University of Alberta

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Sources

Wie Knetmasse: Massives Eisen im Erdkern verformt sich um zehn Meter – mit Folgen für jeden Tag [www.leinetal24.de]
Wie Knetmasse: Massives Eisen im Erdkern verformt sich um zehn Meter – mit Folgen für jeden Tag [www.tz.de]
Wie Knetmasse: Massives Eisen im Erdkern verformt sich um zehn Meter – mit Folgen für jeden Tag [www.kreiszeitung.de]
Wie Knetmasse: Massives Eisen im Erdkern verformt sich um zehn Meter – mit Folgen für jeden Tag [www.hna.de]