Re: [LEAPSECS] Multidecadal variation of the Earth’s inner-core rotation

[Poul-Henning Kamp]

Brooks Harris writes:

> Multidecadal variation of the Earth's inner-core rotation

Thanks a LOT!

If I read this right, 1955 was the worst possible time for IAU
define the second ?

In 1955, purely by accident, the inner core was at the same stage
of it's multidecal oscillation (Extended data, fig 7), as when
Newcomb made the astronomical observations in the 1890'ies on which
IAU based their definition of the second, and so, presumably, all
the contemporary LOD observations, moon camera and all that, gave
results close to Newcombs.


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[LEAPSECS] Multidecadal variation of the Earth’s inner-core rotation

[Brooks Harris]

Terrawatch: why has the Earth’s spinning inner core slowed down?
https://www.theguardian.com/science/2023/feb/22/terrawatch-earth-spinning-inner-core-slowed-down

Multidecadal variation of the Earth’s inner-core rotation
https://www.nature.com/articles/s41561-022-01112-z.epdf?sharing_token=FE2fAKiT5WKoX4FPLxkG5NRgN0jAjWel9jnR3ZoTv0N-n5CKH8sZM_u5cEFurTAJryk-7LHJO5K2v-0f42K8qTrBUNqbJ90KaKGrtjU6uYKPRy5DiwyX8ua0uusieCTa77gm8OXtGcalO2w70mNfuhHmTi2kP-Yrc71C2J9-bEbKO6vLYGoZH6y9mujE0FrQzE6gJLfnnGPGtKHMzkhm0KS_873xnE5ST9OiRC5dROc%3D_referrer=www.theguardian.com
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