Simulations of micrometeoroid interactions with the Earth atmosphere
Simulations of micrometeoroid interactions with the Earth atmosphere
复制标题
微流星体与地球大气相互作用的模拟
DOI：
10.1051/0004-6361/201219658
复制
发表时间：
2013
影响因子：
6.5
通讯作者：
S. Aiello
中科院分区：
文献类型：
--
作者：
G. Briani;E. Pace;S. Shore;G. Pupillo;A. Passaro;S. Aiello
目标。微流星体（宇宙尘埃，大小在几个微米到100毫米之间）主导着每年向地球的地外质量通量。我们调查微流星体穿越大气层时发生的物理过程的范围。我们计算的时间（和高度）依赖的质量损失，能量平衡，和动态，以确定哪些过程决定他们的生存范围的进入条件。方法.建立了一个微流星体与大气相互作用的通用数值模式。对于不同的进入条件（例如初始半径、入射速度和角度），同时求解运动、能量和质量平衡方程。在能量方程和质量平衡中考虑了几种不同的物理过程，以便了解它们在微流星体-大气相互作用期间的相对作用和演变。特别是，分析微流星体的热历史，我们包括在能量平衡：与大气粒子的碰撞，微流星体辐射发射，蒸发，熔化，溅射和动能的烧蚀质量。结果低的进入速度和掠入射角有利于微流星体的生存。在那些幸存下来的，我们的模型区分（1）微流星体谁达到熔化温度和熔化是最有效的质量损失机制，和（2）微流星体的烧蚀由于蒸发造成的大部分质量损失。熔化是最有效的冷却机制。溅射引起的质量损失可以忽略不计。
Aims. Micrometeoroids (cosmic dust with size between a few μ ma nd∼1 mm) dominate the annual extraterrestrial mass flux to the Earth. We investigate the range of physical processes occurring when micrometeoroids traverse the atmosphere. We compute the time (and altitude) dependent mass loss, energy balance, and dynamics to identify which processes determine their survival for a range of entry conditions. Methods. We develop a general numerical model for the micrometeoroid-atmosphere interaction. The equations of motion, energy, and mass balance are simultaneously solved for different entry conditions (e.g. initial radii, incident speeds and angles). Several different physical processes are taken into account in the equation of energy and in the mass balance, in order to understand their relative roles and evolution during the micrometeoroid-atmosphere interaction. In particular, to analyze the micrometeoroid thermal history we include in the energy balance: collisions with atmospheric particles, micrometeoroid radiation emission, evaporation, melting, sputtering and kinetic energy of the ablated mass. Results. Low entry velocities and grazing incidence angles favor micrometeoroid survival. Among those that survive, our model distinguishes (1) micrometeoroids who reach the melting temperature and for which melting is the most effective mass loss mechanism, and (2) micrometeoroids for which ablation due to evaporation causes most of the the mass loss. Melting is the most effective cooling mechanism. Sputtering-induced mass loss is negligible.
流星烧蚀的化学模型
影响因子：
6.3
作者：
Vondrak T
通讯作者：
Vondrak T