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| Titel |
Interpretation of the microwave non-thermal radiation of the Moon during impact events |
| VerfasserIn |
V. Grimalsky, A. Berezhnoy, A. Kotsarenko, N. Makarets, S. Koshevaya, R. Pérez Enríquez |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 4, no. 5/6 ; Nr. 4, no. 5/6 (2004-11-30), S.793-798 |
| Datensatznummer |
250001397
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| Publikation (Nr.) |
 copernicus.org/nhess-4-793-2004.pdf |
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| Zusammenfassung |
| 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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