Heating and Acceleration of Protons and Minor Ions by Fast Shocks in the Solar Corona

摘要: We propose a new mechanism of coronal heating, in which protons and minor ions are heated accelerated by fast shocks. The interaction between network magnetic fields emerging intranetwork may lead to the formation thin current sheets, triggers reconnection microflares. disruption sheet leads shocks with an Alfven Mach number MA < 2. In addition, that originate chromosphere smaller scale produce spicules then enter corona. heating acceleration examined based on theoretical model hybrid simulations. results show following: (1) near nondeflection ion motion across shock ramp large perpendicular thermal velocity (vth⊥), depends mass/charge ratio; (2) for subcritical 1.1 ≤ 1.5, temperature anisotropy T⊥/T|| ≈ 50 O5+ mild 1.2 protons; (3) these can directly drive outward field-aligned ~ 0.1VA 240 km s-1 (4) be converted radial outflow (u) diverging field lines; (5) 1.5 u(O5+) vth⊥(O5+) 460 u(H+) vth⊥(H+) at r = 3-4 R☉. Our explain recent Solar Heliospheric Observatory observations solar