Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p31b1405s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P31B-1405
Physics
5134 Thermal Properties, 5418 Heat Flow, 5470 Surface Materials And Properties, 5494 Instruments And Techniques, 7974 Solar Effects
Scientific paper
We use the seismic records obtained with the geophones of Apollo 17 seismic experiment at the Taurus Littrow landing site to measure variations of the seismic velocity in the lunar regolith. From the eight month long noise records we retrieve Green's functions between the sensors for successive 24 hour periods. By comparing the Greens functions of the different periods we observe cyclic variations of seismic velocity. Spectral analysis suggests that the variations are related to the influence of the sun rather than to the influence of the Earth. This implies that the temperature changes between lunar day and night speed up or slow down the seismic waves. With finite difference simulations we show that the observations are in accordance with expectations based on current knowledge of the thermal properties of the lunar regolith. A long term variation is also observed that is in phase with variation of solar energy flux due to distance changes between the Earth-moon system and the sun.
Larose E.
Sens-Schönfelder Christoph
Stahler Steven
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