IAGA has a lot of different scientists working on various topics. In this series of blogs, we will introduce some topics that are being worked on by PhD students. Hopefully this will give a better picture of the work being done in the field and encourage more early career researchers.
Hannah Rogers, a PhD candidate at the University of Edinburgh, says:
In my research, I'm interested in separating the Earth's magnetic field into local regions to better comprehend the core-mantle interactions. Most core flow and magnetic field models are described by spherical harmonics. However, they are not suitable for separation into different regions due to leakage. I instead use spherical Slepian functions to spatially and spectrally separate bandlimited potential fields. Long-lived features of the magnetic field have been guessed to be linked to Large Low Velocity Provinces (LLVPs). They are low seismic velocity regions in the lowermost mantle. My aim is to use the Slepian functions to investigate how LLVPs affect core surface flows over time.
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| The outer core and lower mantle interactions. The arrows represent the magnetic field lines. Credits : Kay Lancaster |
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