[LEAPSECS] DUT1 = 0

[Brooks Harris]

THE PLANET INSIDE
Scientists are probing the secrets of the inner core---and learning how 
it might have saved life on Earth
https://www.science.org/content/article/scientists-probing-secrets-earths-inner-core-saved-life-planet

An accelerating high-latitude jet in Earth's core
https://eprints.whiterose.ac.uk/108112/1/accepted_version.pdf

Measurement of diurnal and semidiurnal rotational variations and tidal 
parameters of Earth
https://www.researchgate.net/publication/4681204_Measurement_of_diurnal_and_semidiurnal_rotational_variations_and_tidal_parameters_of_Earth

Ocean and atmospheric tides standards (used for EIGEN gravity field 
modeling)
https://iers-conventions.obspm.fr/content/supporting_material/chapter6/BIPM_ocean_tides_2007.pdf

"Prediction is difficult, especially about the future."

-Brooks


On 2022-07-06 4:38 PM, Billy Croan wrote:
> Interesting that the reversal in direction for the first time in two 
> decades (maybe more?) is continuing.
>
> I wonder if they will announce the cause of these adjustments.  i.e. a 
> specific hurricane or earthquake or interstellar solar radiation?
>
> IERS' website leaves much to be desired.
>
> I'd love to know, if there was some physics student on this list, how 
> much energy would it consume to physically alter the earth's rotation 
> instead of using leap seconds.  Yeah, moving the world sounds like a 
> de-facto 'can't be done' scenario.
>
> But we're talking an extremely small difference in rotation over the 
> course of ten years.  If all aircraft landed (and used their brakes) 
> in the same direction, would that impart a measurable spin over the 
> course of a decade?  Could a few large gyros, operating continuously 
> for a decade, even out the spin?  Would their energy cost over that 
> time be more than the cost of the software bugs that leap seconds 
> effervesce?
>
> On Wed, Jul 6, 2022 at 2:09 PM John Sauter via LEAPSECS 
> <leapsecs at leapsecond.com <mailto:leapsecs at leapsecond.com>> wrote:
>
>     I hope everyone noticed that the IERS issued Bulletin D 142 today,
>     which raises DUT1 from -0.1 to 0 as of July 28.  I attach the bulletin
>     and my chart of values of DUT1.  I predict a negative leap second
>     around the end of this decade.
>         John Sauter (John_Sauter at systemeyescomputerstore.com
>     <mailto:John_Sauter at systemeyescomputerstore.com>)
>     -- 
>     get my PGP public key with gpg --locate-external-keys
>     John_Sauter at systemeyescomputerstore.com
>     <mailto:John_Sauter at systemeyescomputerstore.com>
>
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