P-34 LIGO BayesWave Signal Algorithm

Buller Hall 150

Kelvin-Helmholtz vortices frequently develop at the magnetopause boundary of planetary magnetospheres. The nonlinear development of vortices involves coalescence, where smaller vortices combine into larger vortices in an inverse cascade. Large-scale structures tend to grow slower, yet saturate at larger amplitude, so the shift in scale may simply result from small-scale structures nonlinearly saturating while large-scale structures grow linearly. Alternatively, energy could be transferred between scales through nonlinear cross-scale turbulent coupling. We utilize transfer entropy to explore cross-scale coupling in hybrid simulations of Kelvin-Helmholtz instability. The analysis provides evidence that nonlinear coupling across scales is important in the coalescence process and identifies the temporal and spatial scales over which the coupling occurs.