The Earth's inner core rotates at a slower pace compared to the planet's outer layers. This implies that the Earth's inner core doesn't completely align with the rest of the planet in terms of rotation, leading to some interesting geological phenomena.

Slower rotation in the Earth's inner core implies a decreased spin rate compared to previous observations. This change affects the core's overall movement, potentially impacting the planet's magnetic field and geological activity. - Earth's Inner Core Exhibits Slower Spinning Rate

The geodynamo, a phenomenon that governs the Earth's rotation and magnetic field, continues to captivate scientists worldwide. Debates about the age, composition, and influence of the Earth's core on our planet's behaviour are ongoing.

At the heart of our planet lies a metallic sphere, the inner core, which organizes the movement of the liquid outer core. The outer core, predominantly composed of iron, generates the Earth's magnetic field through electric currents. This magnetic field shields us from harmful solar radiation.

Recent studies suggest that the Earth's core is in a phase of westward sub-rotation. However, the relative rotation of the inner core and the Earth's mantle cannot halt, but it can be very low if they move nearly parallel to each other. This slow rotation has been observed since 2008, with the inner core rotating slower than in previous decades.

The changes in the inner Earth's core play a role in influencing the dynamics of the liquid core. Small oscillations in the dynamics of the liquid core can lead to fluctuations in the rotation speed of the Earth's mantle, potentially causing changes in day lengths.

Researchers such as Peter Olson and Sebastien Le Mouel have delved into the Earth's long rotational cycles, finding that variations in the Earth's inner core rotation influence the length of day and geomagnetic field behaviour. The inner Earth's core's viscous deformation may be related to the cycles in its rotation.

Understanding the fluctuations in the Earth's rotational behaviour is challenging. Scientists have difficulty understanding the reasons behind these changes, and the exact impact on the Earth's magnetic field remains unclear. Some studies suggest that rotation changes may occur in 20 to 30 years, as stated by Steinle-Neumann, while others suggest a cycle of approximately every 70 years.

Despite the fascination with the Earth's core, it remains inaccessible. As Steinle-Neumann states, we will never be able to go to the inner Earth's core. However, seismic data can provide insights into the Earth's core rotation, offering a means to study this enigmatic region.

One aspect that is certain is the direction of rotation of the inner core, relative to the Earth's mantle, has changed to the east. The inner Earth's core deforms over long scales, acting more like slush ice or modeling clay, as explained by Steinle-Neumann.

Interestingly, the migration routes of migratory birds would not be affected by changes in the Earth's core, as there are hardly any noticeable changes magnetically at the surface. The Earth's magnetic field, generated by the outer core, provides a stable compass for these birds, allowing them to navigate their long journeys.

In conclusion, the geodynamo remains a fascinating and complex subject, offering a glimpse into the inner workings of our planet. While much remains unknown, ongoing research continues to unravel the mysteries of the Earth's core and its influence on our world.