螺旋桨随机飞行
Stochastic flights of propellers
摘要：
土星A环中千米大小的小卫星在周围物质中产生了S形的尾流，称为“螺旋桨”。卡西尼号航天器已经跟踪了螺旋桨的运动数年，发现它们偏离了具有恒定半长轴的开普勒轨道。已知推断出的轨道迁移会转换符号。我们使用的统计检验表明，螺旋桨Blériot的轨道的时间序列是一致的，与时间积分的高斯随机游走。也就是说，布莱里奥观察到的迁移模式与随机性是一致的。我们进一步表明，使用分析估计和碰撞N体模拟相结合，随机迁移的权利的大小，以解释卡西尼观测可以驱动遇到环粒子半径10-20米。当地的环质量集中在十米大小的粒子是支持独立的理由掩星分析。
英文摘要：
Kilometer-sized moonlets in Saturn's A ring create S-shaped wakes called "propellers" in surrounding material. The Cassini spacecraft has tracked the motions of propellers for several years and finds that they deviate from Keplerian orbits having constant semimajor axes. The inferred orbital migration is known to switch sign. We show using a statistical test that the time series of orbital longitudes of the propeller Blériot is consistent with that of a time-integrated Gaussian random walk. That is, Blériot's observed migration pattern is consistent with being stochastic. We further show, using a combination of analytic estimates and collisional N-body simulations, that stochastic migration of the right magnitude to explain the Cassini observations can be driven by encounters with ring particles 10-20 m in radius. That the local ring mass is concentrated in decameter-sized particles is supported on independent grounds by occultation analyses.
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