斜C型激波中的溅射
Sputtering in oblique C-type shocks
摘要：
我们提出的第一个结果溅射的粮食地幔和核心获得自洽的多流体磁流体模型的C型冲击传播通过尘埃介质。地幔溅射的阈值冲击速度约为10 km/s，且与密度无关。地幔在速度为20-25 km/s的冲击中完全蒸发。在这样的冲击速度核心溅射开始和气相SiO的形式。在任何C型冲击中，核心的破坏都不是完全的，因为在J型冲击出现的最小速度附近的冲击中，晶粒并没有完全被破坏。由于这种转变的临界冲击速度与密度相关，在较低密度气体中传播的冲击后面会产生较高的气相一氧化硅丰度。对于冲击速度附近的阈值速度的核心和地幔溅射，溅射是更大的冲击速度在较小的角度相对于上游磁场。在较高的冲击速度下，角变化仍然存在，但不太明显。
英文摘要：
We present the first results for the sputtering of grain mantles and cores obtained with self-consistent multifluid hydromagnetic models of C-type shocks propagating through dusty media. The threshold shock speed for mantle sputtering is about 10 km/s and is independent of density. The mantles are completely vapourised in shocks with speeds of 20-25 km/s. At such shock speeds core sputtering commences and gas-phase SiO forms. Core destruction is not total in any C-type shock because grains are not completely destroyed in shocks with speeds near the minimum speeds at which J-type shocks appear. Due to the density-dependence of the critical shock speed for this transition, higher gas-phase SiO fractional abundances are produced behind shocks propagating in lower density gas. For shock speeds near the threshold speeds for both core and mantle sputtering, sputtering is much greater for shock velocities at smaller angles relative to the upstream magnetic field. At higher shock speeds, the angular variation is still present but less pronounced.
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