Multiscale Features of the Near-Hermean Environment as Derived Through the Hilbert-Huang Transform

The interaction between the interplanetary medium and planetary environments gives rise to different phenomena on several temporal spatial scales. Here, we propose for first time, application of Hilbert-Huang Transform (HHT) characterize both local global properties Mercury's environment as seen during two Mercury Surface, Space Environment, Geochemistry Ranging (MESSENGER) flybys. In particular, compute energy-time-frequency distribution observed magnetic field components reconstruction these signals at large, magnetohydrodynamics (MHD) kinetic scales through empirical mode decomposition. We show that HHT analysis allows capture reproduce some interesting features Hermean such flux transfer events (FTEs), Kelvin-Helmholtz vortices, ultralow frequency (ULF) wave activity. Moreover, our findings support ion nature plasma structures, characterization magnetosheath by anisotropic ion-kinetic intermittent fluctuations, superimposed MHD fluctuations large-scale structure. Our approach has proven be very promising characterizing structure dynamics scales, identifying boundaries, discriminating scale-dependent source processes can used modeling purposes.