Abstract
A plasma—dust system in the near-surface layer on the illuminated side of the Moon is described. The system involves photoelectrons, solar-wind electrons and ions, neutrals, and charged dust grains. Linear and nonlinear waves in the plasma near the Moon’s surface are discussed. It is noticed that the velocity distribution of photoelectrons can be represented as a superposition of two distribution functions characterized by different electron temperatures: lower energy electrons are knocked out of lunar regolith by photons with energies close to the work function of regolith, whereas higher energy electrons are knocked out by photons corresponding to the peak at 10.2 eV in the solar radiation spectrum. The anisotropy of the electron velocity distribution function is distorted due to the solar wind motion with respect to photoelectrons and dust grains, which leads to the development of instability and excitation of high-frequency oscillations with frequencies in the range of Langmuir and electromagnetic waves. In addition, dust acoustic waves can be excited, e.g., near the lunar terminator. Solutions in the form of dust acoustic solitons corresponding to the parameters of the dust—plasma system in the near-surface layer of the illuminated Moon’s surface are found. Ranges of possible Mach numbers and soliton amplitudes are determined.
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Original Russian Text © T.I. Morozova, S.I. Kopnin, S.I. Popel, 2015, published in Fizika Plazmy, 2015, Vol. 41, No. 10, pp. 867–876.
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Morozova, T.I., Kopnin, S.I. & Popel, S.I. Wave processes in dusty plasma near the Moon’s surface. Plasma Phys. Rep. 41, 799–807 (2015). https://doi.org/10.1134/S1063780X15100062
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DOI: https://doi.org/10.1134/S1063780X15100062