Physical Processes on Interplanetary Dust
Physical Processes on Interplanetary Dust
复制标题
行星际尘埃的物理过程
DOI：
10.1007/978-3-642-56428-4_10
复制
发表时间：
2001
影响因子：
4.8
通讯作者：
O. Havnes
中科院分区：
文献类型：
--
作者：
T. Mukai;A. Nakamura;J. Blum;Robert E. Johnson;O. Havnes
本章讨论影响星际尘埃颗粒的物理过程，包括决定尘埃形成、生长、破坏和改变的过程。凝结和聚集的计算机模拟和实验室研究表明，在太阳系早期，当撞击能量太低而无法破坏碰撞颗粒时，固体颗粒之间的相互碰撞决定了固体聚集体的生长。另一方面，碎裂发生在目前普遍存在的高撞击能量下，从流星体、小行星和卫星表面以及升华的彗星上产生尘埃。这种冲击过程是基于实验室测量的汇编（例如，碎片的大小、形状、速度和自旋分布）进行讨论的。由于太阳辐射和高能粒子的撞击，目前太阳系中的尘埃颗粒逐渐发生变化。升华、溅射和充电可以改变星际尘埃颗粒的性质。研究了尘埃颗粒温度、太阳风溅射引起的侵蚀速率和表面电荷。关于行星际尘埃颗粒物理/化学/矿物学性质变化的证据仍然很少。因此，我们讨论预期的变化，指的是那些可以在实验室实验中模拟的物理过程，以及通过理论建模获得的类似物。
This chapter discusses physical processes affecting interplanetary dust grains, including processes determining dust formation, growth, disruption, and alteration. Computer simulations and laboratory studies of coagulation and aggregation show that mutual collisions between solid grains determine the growth of solid aggregates in the early solar system when the impact energies are too low to destroy the colliding grains. On the other hand, fragmentation occurs at the high impact energies that currently prevail, generating dust from meteoroids, asteroid, and satellite surfaces as well as from sublimating comets. Such impact processes are discussed based on a compilation of laboratory measurements (e.g., size, shape, velocity and spin distributions of fragments). Gradual alteration of the dust grains occurs in the present solar system due to solar radiation and energetic particle impact. Sublimation, sputtering and charging can alter the nature of interplanetary dust grains. Dust grain temperatures, erosion rates due to solar-wind-induced sputtering, and surface charges are studied. The evidence for alteration of physical/chemical/mineralogical properties of interplanetary dust grains is still rather poor. Therefore, we discuss the expected changes, referring to those physical processes that can be simulated in laboratory experiments, and to their analogues obtained through theoretical modeling.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell