Magnetosheath Filamentary Structures Formed by Ion Acceleration at the Quasi-Parallel Bow Shock

摘要: Results from 2.5-D electromagnetic hybrid simulations show the formation of field-aligned, filamentary plasma structures in magnetosheath. They begin at quasi-parallel bow shock and extend far into These exhibit anticorrelated, spatial oscillations density ion temperature. Closer to shock, magnetic field variations associated with temperature may also be present. Magnetosheath (MFS) form primarily sheath; however, they quasi-perpendicular occur over a wide range solar wind Alfvenic Mach numbers interplanetary directions. At lower levels magnetosheath turbulence, MFS remain highly coherent large distances. higher numbers, turbulence decreases level coherence. result localized acceleration injection energetic ions The nature is tied generation fast magnetosonic waves upstream shock. increased pressure flux tubes containing accelerated results depletion thermal these enhancement void ions. This observed anticorrelation between density.