Kinetic-scale magnetic turbulence and finite Larmor radius effects at Mercury

摘要: We use a nonstationary generalization of the higher-order structure function technique to investigate statistical properties magnetic field fluctuations recorded by MESSENGER spacecraft during its first flyby (01/14/2008) through near Mercury's space environment, with emphasis on key boundary regions participating in solar wind -- magnetosphere interaction. Our analysis shows, for time, that kinetic-scale play significant role up largest resolvable time scale ~20 s imposed signal nonstationarity, suggesting turbulence at this planet is largely controlled finite Larmor radius effects. In particular, we report presence highly turbulent and extended foreshock system filled packets ULF oscillations, broad-band intermittent magnetosheath, ion-kinetic central plasma sheet magnetotail, inner current encountered outbound (dawn-side) magnetopause. Overall, our measurements indicate Hermean magnetosphere, as well surrounding region, are strongly affected non-MHD effects introduced sizes cyclotron orbits constituting ion species. Physical mechanisms these their potentially critical impact dynamics remain be understood.