{"id":14225,"date":"2023-01-24T18:52:51","date_gmt":"2023-01-24T16:52:51","guid":{"rendered":"https:\/\/www.arnoschrauwers.nl\/weblog\/?p=14225"},"modified":"2023-01-24T18:52:51","modified_gmt":"2023-01-24T16:52:51","slug":"lengte-dag-verschilt-door-bewegingen-in-aardkern","status":"publish","type":"post","link":"https:\/\/www.arnoschrauwers.nl\/weblog\/24\/01\/2023\/lengte-dag-verschilt-door-bewegingen-in-aardkern\/","title":{"rendered":"Lengte dag verschilt door bewegingen in aardkern"},"content":{"rendered":"
\"Aardmantel\"<\/a>

Schema van de aardlagen: van mantel tot vloeibare kern (afb: WikiMedia Commons)<\/p><\/div>\n

Een dag (24 uur) is zo lang als de aarde nodig heeft om om zijn as te draaien. Gegevens die afkomstig zijn van de banen van aardbevingsgolven zouden er op wijzen dat de verschillen in bewegingen in de (vloeibare) aardkern<\/a> en aardmantel invloed hebben op de draaisnelheid en daarmee op de lengte van een dag.
\nAan de hand van de banen aardbevingsgolven hebben Chinese onderzoekers een afwijkingscyclus van zo’n zeventig jaar berekend. Tussen 1980 en 2000 draaide de aardkern ietsje sneller dan de aardmantel. Sedertdien werd dat verschil weer kleiner.
\nDeze periodiciteit van meerdere decennia valt volgens de onderzoekers samen met veranderingen in verschillende andere geofysische waarnemingen, met name de lengte van de dag en het magnetisch veld.<\/p>\n

Bron: der Spiegel<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

De snelheid waarmee de aardkern en de aardmantel draait kan verschillen en daarmee de daglengte, ontdekten Chinese onderzoekers. 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