Meteoroid impacts and dust particles in near-surface lunar exosphere

31st International Conference on Equations of State for Matter

Popel, S.I.^1 ; Golub, A.P.^1 ; Lisin, E.A.^2 ; Izvekova, Yu.N.^1 ; Atamaniuk, B.^3 ; Dolnikov, G.G.^1 ; Zakharov, A.V.^1 ; Zelenyi, L.M.^1

Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, Moscow

117997, Russia^1

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13 Bldg 2, Moscow

125412, Russia^2

Space Research Center, Polish Academy of Sciences, Bartycka 18a, Warsaw

00-716, Poland^3

关键词: Dust particle;    Irreversible deformation;    Lunar exospheres;    Lunar regolith;    Lunar surface;    Meteoroid impacts;    Micrometeoroid impacts;    Near surfaces;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012175/pdf
DOI  :  10.1088/1742-6596/774/1/012175

来源: IOP

【 摘 要 】

It is shown that for consideration of dust particle release from the lunar surface one has to take into account (among other effects) both adhesion and meteoroid impacts. The effect of surface roughness on the adhesion intensity on the Moon is discussed. The rate of meteoroid impacts with the lunar surface per unit area is determined. The strength of the regolith due to the adhesion effect is estimated. The processes occurring when a high-speed meteoroid impacts with the lunar surface are described. In particular, the characteristic parameters of zones of evaporation of the substance, its melting, destruction of particles constituting lunar regolith, their irreversible deformations, and elastic deformation of the regolith substance are found. A possibility of the rise of micrometer-sized dust particles above the lunar surface is shown. It is demonstrated that most of the particles rising over lunar surface due to the meteoroid impact originates from the elastic deformation zone. The number of dust particles raised over the lunar surface as result of meteoroid impacts is calculated. The size-distribution function of particles released from the lunar surface due to meteoroid impacts is determined. It is noted that micrometeoroid impacts can result in rise of dust particles of the size of a few μm up to an altitude of about 30 cm that explains the effect of "horizon glow" observed by Surveyor lunar lander.