Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p13d1721d&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P13D-1721
Physics
[5430] Planetary Sciences: Solid Surface Planets / Interiors, [5794] Planetary Sciences: Fluid Planets / Instruments And Techniques
Scientific paper
The objective of the Selene 2 LBBS experiment is the determination of the deep internal structure of Moon. Geophysical parameters of first importance, such as the state (liquid/solid) and size of the core, the structure of the mantle, including discontinuities will be determined by the experience, which will therefore provide key constrains on the formation and evolution of the Moon. It will measure seismic activity in a very broad band of signal, from about 10 mHz up 50 Hz, to address the widest range of scientific questions, from the state of the inner core to the meteoritic rate measurement. Based on the seismicity observed during the Apollo seismic experiment, we first present the detection perspectives of the LBBS in term of Deep Moon quakes and impacts for both the nominal experiment time ( 2 months) and an extended operation ( 1 year). This analysis is done for two possible landing sites ( Apollo 14 and Tycho). A special focus is given to the detection of deep core phase ( PcP, ScS, SKS, PKP) and to the expected signal to noise of these phase, in different frequency bandwidth.We also analyse the possibility to complement the seismic experiment with a network of earth telescops, in order to detect and locate the impacts near the landing site and provide the associated perspectives in term of regional crustal and upper mantle structure determination. The seismometer is based on a hybrid 6-axis instrument, composed of 3 Very Broad Band (VBB) sensors, 3 Short Period (SP) sensors. It will allow very broad band measurements from 0.01 Hz to 50 Hz. Those six sensors will be sealed in a "spherical" container providing shielding against dust and filtering thermal noise. A leveling system will level this sensor assembly while providing coupling with the ground. A dedicated electronics will manage the overall experiment and ultra-low noise, space qualified 24 bits A/D converters will perform the acquisition. This electronic will be located inside the survival module.
Christensen Ulrich R.
de Raucourt S.
Gagnepain-Beyneix Jeannine
Garcia Raphaël F.
Giardini Domenico
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