Intermediate scale lunar roughness

Bastin, J. A.; Gough, D. O.

doi:10.1016/0019-1035(69)90064-5

Cited by 21 publications

(7 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As before, roughness on the centimeter scale is especially effective in altering the thermal emission properties of the surface, because on this scale lateral conduction does not completely obliterate smallscale temperature differences. Bastin and Gough (1969) have solved the thermal conduction problem in a highly idealized two-dimensional structure consisting of a parallel array of grooves or troughs. During the lunar night, the ridges cool more rapidly and the troughs less rapidly than a plane-parallel surface with the same thermal properties.…”

Section: Iv) Centimeter Scale Roughnessmentioning

confidence: 99%

“…We suspect that the above calculation overstates the error in the deduced value of <7X0, tyy due to roughness, for two reasons, (a) The lunar surface roughness is certainly disordered rather than ordered. The regularity of the pattern used by Bastin and Gough (1969) tends to enhance the directionality of nighttime emission and thus the enhancement of F(0, 180°). {b) In Surveyor 1-6 and Apollo 11 pictures, most of the centimeter scale relief appears to be due to shallow craters rather than to rocks lying above the surface.…”

Section: Iv) Centimeter Scale Roughnessmentioning

confidence: 99%

“…A definitive test would be a determination of the mean slope and especially the slope frequency distribution on scales of 1-10 cm from Surveyor 6 photographs of the Sinus Midii area at the center of the disk. It seems likely from Bastin and Gough's (1969) computations that if the grooves were 12 cm apart instead of 8 cm, corresponding to a JEFFREY L. LINSKY decrease in mean slope from 45° to 36°, then the error in the deduced value of <r(0, 0) would be more than halved.…”

Section: Iv) Centimeter Scale Roughnessmentioning

confidence: 99%

“…When radiation plays any role at all in heat transport, the functional form is usually that of equation 6. This is true even for a rough surface model consisting of deep holes (Bastin and Gough 1969). If the pore sizes in the material are very much less than the mean free path of thermal photons, the radiative term in equation 6will be proportional to T 2 rather than to T 3 (Troitsky et al 1968).…”

Section: B) Inhomogeneitymentioning

confidence: 99%

“…Very recentlyBirkebak and Abdulkadir (1972) have found for Apollo 12 and 14 soil samples 7i R ä 0.93 at 400° K and 0.975 at 100° K. © American Astronomical Society • Provided by the NASA Astrophysics Data System 1973ApJS...25..163L…”

mentioning

confidence: 99%

See 4 more Smart Citations

The Moon as a Proposed Radiometric Standard for Microwave and Infrared Observations of Extended Sources

Linsky¹

1973

ApJS

View full text Add to dashboard Cite

Measured values of the average midnight and morning terminator infrared brightness temperatures of the central portion of the lunar disk can quite accurately determine the mean surface temperature despite likely horizontal and vertical inhomogeneities of the thermal properties of the lunar soil. These data together with laboratory measurements on lunar soil and in situ temperature measurements in and on the lunar surface lead to a mean surface temperature of 220.5° K ± 2.5 percent and a mean temperature 35° K hotter at a depth of 1 m. The monthly average brightness temperature is then estimated as a function of wavelength between 10 ^m and 100 cm taking into account likely temperature dependencies of the thermal conductivity and loss tangent, and the variation of emissivity with wavelength. The accuracy with which the Moon can be used as an absolute radiometric standard for extended sources is estimated based on the likely range of lunar thermal and electromagnetic properties. Subject headings: infrared-Moon-radio radiation-radio radiation, planetary

show abstract

Section: Iv) Centimeter Scale Roughnessmentioning

confidence: 99%

Section: Iv) Centimeter Scale Roughnessmentioning

confidence: 99%

Section: Iv) Centimeter Scale Roughnessmentioning

confidence: 99%

Section: B) Inhomogeneitymentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations