Abstract

It is shown that the horizontal winds in Martian ionosphere, at the initial stage of their interaction with dusty plasma clouds at altitudes of about 100 km, can cause conditions for the excitation of dust acoustic waves due to the development of kinetic instability. The dispersion relationship of the dust acoustic waves is determined as well as their growth rate in the conditions under study. It is noted that the generation time of the dust acoustic wave is substantially long to allow the formation of nonlinear plasma wave structures, e.g., solitons. Dust acoustic solitons that propagate in Martian ionosphere in the dusty plasma clouds at altitudes of about 100 km are studied. It is shown that the increase in dust particle number density or decrease in electron number density by one order of magnitude leads to the increase of the amplitude of dust acoustic solitons by one order of magnitude. The possibility of generation of dust acoustic perturbations in Martian ionosphere should be taken into account during processing and interpretation of observation data.

中文翻译：

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火星电离层粉尘声扰动的可能性

摘要

结果表明，火星电离层中的水平风在大约100 km的高度与尘埃等离子云相互作用的初始阶段，会由于动力学不稳定的发展而产生激发尘埃声波的条件。确定在研究条件下尘埃声波的色散关系及其增长率。注意，尘埃声波的产生时间基本上很长，以允许形成非线性等离子波结构，例如孤子。研究了在大约100 km高度的尘埃等离子体云中在火星电离层中传播的尘埃声孤子。可以看出，尘埃粒子数密度的增加或电子数密度的减少一个数量级导致尘埃声孤子的振幅增加一个数量级。在处理和解释观测数据时，应考虑火星电离层产生尘埃声波扰动的可能性。