© Sabrina Sanchez
Sanja Panovska vom GFZ Helmholtz-Zentrum für Geoforschung präsentiert ihre Forschung in einem Vortrag mit dem Titel Unraveling the Earth’s Magnetic Past through Reconstructions from ka to Ma Timescales. Der Vortrag findet auf englischer Sprache statt.
Co-Host ist dieses Mal Sunaina Shinu.
Das DeepDyn Seminar findet online als zoom-meeting statt. DeepDyn Mitglieder erhalten den Zuganglink automatisch vor dem Seminar. Wir bitten externe Seminargäste sich für das Seminar zu registrieren, um den Zugangslink zu erhalten.
Unraveling the Earth’s Magnetic Past through Reconstructions from ka to Ma Timescales
Abstract
The main Earth’s magnetic field, generated by magnetohydrodynamic processes in the Earth’s liquid outer core, changes on various spatial and temporal scales. Over geological timescales, these varia/ons can be observed indirectly through remanent magnetization in volcanic rocks and sediments. Our knowledge of long-term geomagnetic changes has greatly improved over the past decades through paleomagneticc records compila/ons and data-based reconstruc/ons. Considerable focus in data-based modeling has been placed on the most extreme events of the geomagne/c field, excursions and reversals. On multi-million-year timescales, due to limited data distribution, only the morphology of the /me-averaged field can be investigated. In this presentation, I will provide an overview of extreme events from a time-dependent perspective, and the structure of the time-averaged field over a range of timescales from ka to Ma. The resulting field structures are analyzed in terms of similarities and differences over time, as well as between normal and transitional periods. They are important for characterizing the different states of the paleomagnetic field and for constraining numerical dynamo simulations.