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Registration Number

0214U001730, 0111U004775 , R & D reports

Title

Identification of the structure anomalies of upper layer of Lunar regolith

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Head

Kaydash Vadym,

Registration Date

25-04-2014

Organization

Kharkov National University named after V.N. Karazin

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Objects of the investigations are the lunar surface and regolith. Goal of the work is obtaining new data about disturbances of lunar regolith structure, caused by both artificial and natural effects. Methods of investigation are obtaining and analysis of spatial distributions of reflectance and color-index phase ratios for investigation of photometric properties of lunar regolith. We found photometric anomalies associated with Apollo landing sites, these anomalies are obviously caused by engine jets of landing modules and astronauts activities. We interpret these anomalies as weakening of shadow-hiding effect when jets from landing engines hit the surface, disturbing the porous structure of very upper regolith layers. Also an implanting of gas into the regolith, i.e. fluidization may disturb the regolith structure. Apollo landing sites reveal no features of spectral slope С(0.750/0.415 m) and depth of 1 micron absorption band of olivine and pyroxene, С(0.950/0.750 m). Thus there was no excavation of immature soils from the depth of more then 10 cm at the landing event. We found a strong positive photometric anomaly in the impact site of Ranger-9 spacecraft. This means a very loosened and rough surface in the rays. Such a complicated relief gives many shadows which gives an increase steepness of phase dependence of brightness. We found changes in spectral slope and absorption band with center near 1 micron as compared with close neighborhood of impact site. This points to to presence of immature soils, excavated from the depth with with boulders and frahments of rocks at the crater formation.

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Кайдаш В.
Опанасенко М.
Петров Д.

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2020-04-02