Andrew Wright on wave coupling
From Andrew Wright - Observations & Simulations of 3D Field Lines Resonances in the Earth's Magnetosphere · · MIST
“When you have a non-uniform medium these two waves are coupled together — imagine having an impulsive solar wind nudge, it's a bit like if you nudge a jelly on a plate it'll reverberate with its natural frequencies.”
On , Andrew Wright, Senior Vice President of General Counsel & Corporate Secretary at 3D SYSTEMS CORP, spoke about wave coupling during Andrew Wright - Observations & Simulations of 3D Field Lines Resonances in the Earth's Magnetosphere on MIST.
About Andrew Wright
Andrew Wright, a reader in the solar and magnetospheric MHD theory group at the University of St Andrews, presented a seminar on September 17, 2024, titled "Observations and Simulations of 3D Field Lines Resonances in the Earth's Magnetosphere." In the talk, Wright discussed the lowest frequency MHD waves, describing how fast modes propagate cross field lines and transport energy from the magnetopause into the magnetosphere. He noted that in a non-uniform medium, these waves are coupled, comparing the effect to nudging a jelly on a plate. Wright stated that his team has "figured out the way of getting the Alfvén frequency for an arbitrary polarization," moving beyond traditional toroidal and poloidal frequencies. He identified data from the Van Allen probes as "a good candidate for a 3D field line resonance," particularly in the afternoon region where strong variations of azimuthal polarization are expected. Wright emphasized that the research has highlighted "how important the cold plasma density is for controlling MHD wave dynamics," especially in structures like plumes. He argued that rotating away from traditional 2D azimuthal polarization is significant for how these waves interact with radiation belt particles, calling this "the subject of ongoing research." Wright also referenced a review paper written by his team members that outlines the current understanding of 3D field line resonance theory.