On Mon 2022-03-07T06:33:31+0000 Poul-Henning Kamp hath writ:
> I looked at the Bulletin A plots this morning to see how DUT1 is
> developing, but then I noticed the 'dX' term plot:
>
>       
> https://datacenter.iers.org/singlePlot.php?plotname=BulletinA_All-DX&id=6
>
> What happened in late 2019 ?

2019 October is when USNO had to take their machines offline due to
new security requirements.

Those artifacts do not show at the ObsPM site
https://hpiers.obspm.fr/eop-pc/index.php?index=analysis&lang=en

--
Steve Allen                    <s...@ucolick.org>              WGS-84 (GPS)
UCO/Lick Observatory--ISB 260  Natural Sciences II, Room 165  Lat  +36.99855
1156 High Street               Voice: +1 831 459 3046         Lng -122.06015
Santa Cruz, CA 95064           https://www.ucolick.org/~sla/  Hgt +250 m
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