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Nonstationary Processes in the Formation of a Dusty Plasma near the Surface of Phobos
JETP Letters ( IF 1.3 ) Pub Date : 2021-06-11 , DOI: 10.1134/s0021364021070079
A. P. Golub’ , S. I. Popel

The formation of a dusty plasma in photoelectric and electrostatic processes in the near-surface layer over the illuminated part of the moon of Mars Phobos is discussed. The parameters characterizing trajectories of dust particles have been determined within a physicomathematical model for the self-consistent description of densities of photoelectrons and dust particles over the illuminated part of the surface of Phobos. It has been shown that the damping of oscillations of a dust particle over the surface of Phobos is related to variations of its charge in agreement with concepts of anomalous dissipation caused by processes associated with variation of charges of dust particles. It has been demonstrated that the damping time of their oscillations for most of the dust particles rising over the surface of Phobos because of photoelectric and electrostatic processes is longer than the daytime; i.e., the nonstationarity of the dusty plasma system over the illuminated part of the surface of Phobos is manifested during almost the entire day on it. The maximum rising altitude and charge that can be reached by dust particles with different sizes have been determined. The typical densities of dust particles and photoelectrons over Phobos have been estimated. To obtain more definite data on the parameters of the dusty plasma system near Phobos, more detailed information on the properties of its soil is necessary; it is expected that this information will be obtained in future space missions.



中文翻译:

火卫一表面附近尘埃等离子体形成的非平稳过程

讨论了在火星火卫一卫星被照亮部分的近地表层中,在光电和静电过程中形成尘埃等离子体。表征尘埃粒子轨迹的参数已在物理数学模型中确定,用于自洽描述火卫一表面受照部分上的光电子和尘埃粒子的密度。已经表明,火卫一表面上尘埃粒子振荡的阻尼与其电荷的变化有关,这与由与尘埃粒子电荷变化相关的过程引起的异常耗散概念一致。已经证明,由于光电和静电过程,大多数在火卫一表面上升的尘埃粒子的振荡阻尼时间比白天长;也就是说,火卫一表面被照亮部分上的尘埃等离子系统的非平稳性在其上几乎一整天都表现出来。已经确定了不同大小的尘埃粒子可以达到的最大上升高度和电荷。已经估计了火卫一上的尘埃粒子和光电子的典型密度。为了获得有关火卫一附近尘土飞扬的等离子体系统参数的更明确数据,需要有关其土壤性质的更详细信息;预计将在未来的空间飞行任务中获得这些信息。

更新日期:2021-06-11
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