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www.nat-hazards-earth-syst-sci.net/4/793/2004/
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Interpretation of the microwave non-thermal radiation of the Moon during impact events
1Instituto Nacional de Astrofisica, Optica y Electronica (INAOE), Puebla, Mexico
2Advanced Research Institute for Science and Engineering, Waseda University, Tokyo, Japan
3Now at: Sternberg Astronomical Institute, Moscow University, Moscow, Russia
4Centro de Geociencias, Juriquilla, UNAM, Querétaro, Mexico
5Kyiv National Shevchenko University, Faculty of Physics, Kyiv, Ukraine
6Universidad Autonoma del Estado de Morelos (UAEM), CIICAp, Cuernavaca, Mexico
Abstract. The results of recent observations of the non-thermal electromagnetic (EM) emission at wavelengths of 2.5cm, 13cm, and 21cm are summarized. After strong impacts of meteorites or spacecrafts (Lunar Prospector) with the Moon's surface, the radio emissions in various frequency ranges were recorded. The most distinctive phenomenon is the appearance of quasi-periodic oscillations with amplitudes of 3–10K during several hours. The mechanism concerning the EM emission from a propagating crack within a piezoactive dielectric medium is considered. The impact may cause the global acoustic oscillations of the Moon. These oscillations lead to the crackening of the Moon's surface. The propagation of a crack within a piezoactive medium is accompanied by the excitation of an alternative current source. It is revealed that the source of the EM emission is the effective transient magnetization that appears in the case of a moving crack in piezoelectrics. The moving crack creates additional non-stationary local mechanical stresses around the apex of the crack, which generate the non-stationary electromagnetic field. For the cracks with a length of 0.1–1µm, the maximum of the EM emission may be in the 1–10GHz range.
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Citation: Grimalsky, V., Berezhnoy, A., Kotsarenko, A., Makarets, N., Koshevaya, S., and Pérez Enríquez, R.: Interpretation of the microwave non-thermal radiation of the Moon during impact events, Nat. Hazards Earth Syst. Sci., 4, 793-798, 2004. Bibtex EndNote Reference Manager
