论文标题
层状和扰动星际冲击的血浆波的artemis观测
ARTEMIS Observations of Plasma Waves in Laminar and Perturbed Interplanetary Shocks
论文作者
论文摘要
月球与太阳的相互作用的加速,重新连接,湍流和电动力学”(Artemis)任务为研究星际间冲击的结构以及相关的血浆波的结构提供了一个独特的机会,其频率介于〜50-8000 Hz之间,这是由于其长时间的持久性电场和磁场突破波形波形捕获率。我们比较了在10分钟内(〜3200个质子gyroradii proton gyroradii,〜1900 〜1900),比较了11个准杂志的爆发行星际冲击时的波性能和发生率。扰动的冲击被定义为在准静态磁场中具有较大的振幅惠斯勒前体,幅度大于1/3,上游和下游平均磁场幅度之间的差异大于1/3。层状冲击缺乏这些大型前体,并且具有光滑的阶跃功能样过渡。除了先前观察到的波模式外,包括离子声学,惠斯勒和静电孤立波,在离子声学频率范围内显示出快速的时间频率变化的波浪很常见。两个层流的坡道区域的坡道区域在坡道中带有突发数据包含广泛的大幅度波模式,而一种带有斜坡爆发数据的扰动冲击没有包含这样的波。通过波粒相互作用的能量耗散在这些层流的冲击中比受干扰的冲击更为突出。在过渡区域,尤其是坡道的层状冲击的波发生率比下游高。扰动的冲击的波浪发生率是层状冲击的2-3倍。
The 'Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon's Interaction with the Sun' (ARTEMIS) mission provides a unique opportunity to study the structure of interplanetary shocks and the associated generation of plasma waves with frequencies between ~50-8000 Hz due to its long duration electric and magnetic field burst waveform captures. We compare wave properties and occurrence rates at 11 quasi-perpendicular interplanetary shocks with burst data within 10 minutes (~3200 proton gyroradii upstream, ~1900 downstream) of the shock ramp. A perturbed shock is defined as possessing a large amplitude whistler precursor in the quasi-static magnetic field with an amplitude greater than 1/3 the difference between the upstream and downstream average magnetic field magnitudes; laminar shocks lack these large precursors and have a smooth, step function-like transition. In addition to wave modes previously observed, including ion acoustic, whistler, and electrostatic solitary waves, waves in the ion acoustic frequency range that show rapid temporal frequency change are common. The ramp region of the two laminar shocks with burst data in the ramp contained a wide range of large amplitude wave modes whereas the one perturbed shock with ramp burst data contained no such waves. Energy dissipation through wave-particle interactions is more prominent in these laminar shocks than the perturbed shock. The wave occurrence rates for laminar shocks are higher in the transition region, especially the ramp, than downstream. Perturbed shocks have approximately 2-3 times the wave occurrence rate downstream than laminar shocks.