论文标题
MMS观察到的行星际冲击中离子的冲击漂移加速度
Shock Drift Acceleration of Ions in an Interplanetary Shock Observed by MMS
论文作者
论文摘要
记录了一场跨磁冲击波，该冲击波在2018年1月8日越过磁层多尺度（MMS）星座。休克的上游等离子体测量表明，在IP冲击坡道中，在IP冲击坡道上有效的质子加速度：2-7 KEV质子在上游观察到3分钟（〜8000 km）在iP shock shock shock suppstream paverem the Rampsness intrempness intrem nestrampnestnements intream the Ip Shocks sumpstream the paversnements opptramnepnnements promptes。从坡道到上游区域的距离缓慢衰减的2-7 keV质子的差分通量（DEF）（DEF）衰减（从坡道上的8个地球半径内下降了一半），并且与坡道相比，下游的距离约为四倍（在距离内的距离（与〜kev Protons of 〜kev Protons相当））。与测试粒子模拟的比较已经证实，加速太阳风质子并在上游注入它们的机制是经典的冲击漂移加速度。这个通过低模拟，准垂直冲击观察到的质子加速度的例子可能适用于天体物理环境，例如超新星残余物或宇宙射线的加速度。
An interplanetary (IP) shock wave was recorded crossing the Magnetospheric Multiscale (MMS) constellation on 2018 January 8. Plasma measurements upstream of the shock indicate efficient proton acceleration in the IP shock ramp: 2-7 keV protons are observed upstream for about three minutes (~8000 km) ahead of the IP shock ramp, outrunning the upstream waves. The differential energy flux (DEF) of 2-7 keV protons decays slowly with distance from the ramp towards the upstream region (dropping by about half within 8 Earth radii from the ramp) and is lessened by a factor of about four in the downstream compared to the ramp (within a distance comparable to the gyroradius of ~keV protons). Comparison with test-particle simulations has confirmed that the mechanism accelerating the solar wind protons and injecting them upstream is classical shock drift acceleration. This example of observed proton acceleration by a low-Mach, quasi-perpendicular shock may be applicable to astrophysical contexts, such as supernova remnants or the acceleration of cosmic rays.
