FEST: 'Solving big problems with tiny signals: Unraveling the behavior of the Earth’s magnetic field using micromagnetic measurements'

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Friday Earth Sciences Talk

Dr Lennart de Groot (Associate Professor Paleomagnetism, Dep. of Earth Sciences)

The Earth’s magnetic field protects our planet against potentially harmful electromagnetically charged particles from the Sun. Moreover, it is our only window into the dynamics of the deep Earth that has a memory in rocks.

To reconstruct the behavior of the Earth’s magnetic field, my group studies magnetic signals stored in volcanic rocks. Due to their complex mineralogy, however, methods to obtain information on the past strength of the Earth’s magnetic field have success rates as low as 10-20%. Therefore, we develop a new method to obtain information from individual grains in a sample: Micromagnetic Tomography. This technique combines a magnetic surface scan of a sample with spatial information on the sizes, shapes, and locations of the iron-oxides obtained from a microCT scan. Then we use a mathematical inversion to obtain the magnetic information of individual grains and interpret only the signals of the most reliable ones.

With the Friday Earth Sciences Talks (FEST) we intend to bring the departments of Earth Sciences and Physical Geography together. The aim is to present (mostly) Utrecht-based Earth Sciences in an accessible way in order i) to stay familiar with each other’s work across disciplines and ii) to help (in particular MSc.) students in their orientation on possible graduation specialisations and future careers. Alumni are also invited.

The FEST is followed by a non-hybrid get-together in the VMA building.

Start date and time
End date and time
Location
Koningsberger building - Pangea room; hybrid via https://tinyurl.com/fest-teams
Entrance fee
no fee or registration