Portal de Periódicos da CAPES

Spectrum analysis of terrain of Mare Cognitum

1966; American Geophysical Union; Volume: 71; Issue: 8 Linguagem: Inglês

10.1029/jz071i008p02023

2156-2202

R. Jaeger, Dieterich J. Schuring,

Space Exploration and Technology

The roughness of a portion of the lunar surface in Mare Cognitum is analyzed and compared with the roughness of the earth's surface in two previously measured areas. A two-dimensional random walk is taken on a contour topographic map produced from photograph P979 provided by Ranger 7. The resulting lunar elevation profile is treated as a realization of an ergodic, stationary time series and is analyzed in the spatial frequency domain by use of estimates of power-spectrum density. Similar estimates are presented for the Ferryman test course at Aberdeen Proving Ground, for a grass runway, and for the Bonito lava flow, Arizona, to provide some basis for roughness comparison. The Aberdeen and Mare Cognitum spectrums are shown to be comparable in basic shape but significantly different in power in certain frequency ranges. An appendix presents a summary of the mathematical methods utilized.