London/ New Delhi: A new research has found that periodic jumps generated by the Earth’s core brings change in the length of a day in every 5.9 years. The research, carried out at the University of Liverpool in UK observed the variations and fluctuations in the day’s length, between 1 to 10 years period, from 1962 and 2012.

It has been found during the research that the length of the day underwent variation between 1 to 10 years and this mainly took place due to movements in Earth’s core. Though the Earth rotates once in a day, the length of the day differs.

Besides that, the reserachers have also found that 300 million years back, a year consisted of 450 days and the length of a day was around 21 hours and it got extended to 24 hours mainly as the Earth’s rotation slowed down. 

Richard Holme, a professor at School of Environmental Sciences conducted a detailed study of variations and fluctuations in a day’s length, mainly between 1 to 10 years from 1962 to 2012.

The study mainly focussed on the effects on the Earth’s rotation of atmosphere and oceanic process, in order to produce a model related to the variations in the day’s length on time scales, longer than a year.

“The model shows well-known variations on decadal time scales, but importantly resolves changes over periods between one and 10 years,” said Holme.

“This study changes fundamentally our understanding of short-period dynamics of the Earth’s fluid core. It leads us to conclude that the Earth’s lower mantle, which sits above the Earth’s outer core, is a poor conductor of electricity giving us new insight into the chemistry and mineralogy of the Earth’s deep interior,” said Holme.


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