Estimation of Apollo Lunar Dust Transport using Optical Extinction Measurements
Abstract
A technique to estimate mass erosion rate of surface soil during landing of the Apollo Lunar Module (LM) and total mass ejected due to the rocket plume interaction is proposed and tested. The erosion rate is proportional to the product of the second moment of the lofted particle size distribution N(D), and third moment of the normalized soil size distribution S(D), divided by the integral of S(D)ṡD2/v(D), where D is particle diameter and v(D) is the vertical component of particle velocity. The second moment of N(D) is estimated by optical extinction analysis of the Apollo cockpit video. Because of the similarity between mass erosion rate of soil as measured by optical extinction and rainfall rate as measured by radar reflectivity, traditional NWS radar/rainfall correlation methodology can be applied to the lunar soil case where various S(D) models are assumed corresponding to specific lunar sites.
 Publication:

Acta Geophysica
 Pub Date:
 April 2015
 DOI:
 10.1515/acgeo20150005
 arXiv:
 arXiv:1503.00154
 Bibcode:
 2015AcGeo..63..568L
 Keywords:

 Mie scattering;
 efficiency factor for extinction;
 particle size distribution;
 mass erosion rate;
 shear stress;
 shape factor;
 Physics  Geophysics;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 Acta Geophysica 2015