Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..461g&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 6, p. 461-464
Astronomy and Astrophysics
Astronomy
7
Astronomical Photometry, Emission Spectra, Lunar Albedo, Moon, Spectral Reflectance, Spectrum Analysis, Ultraviolet Astronomy, Extreme Ultraviolet Explorer Satellite, Extreme Ultraviolet Radiation, Sunlight, Moon, Photometry, Satellite Observations, Euve Satellite, Wavelength, Extreme Ultraviolet, Albedo, Brightness, Reflectance, Origin, Analysis, Formation, Optical Properties
Scientific paper
During its all-sky survey, the Extreme Ultraviolet Explorer (EUVE) satellite observed the Moon several times at first and last quarters, and once immediately following the Dec. 10 1992 lunar eclipse. We present here a portion of this data, in the form of extreme-ultraviolet (EUV) images of the Moon and derived geometric albedos. From the EUVE photometer data we obtain average geometric albedos of 0.15% (+/- 0.03%), 3.1% (+/- 0.3%), and 3.5% (+/- 0.3%), over wavelength intervals of 150-240 A, 400-580 A, and 550-650 A, respectively. An upper limit geometric albedo of 0.13% is obtained for the wavelength interval 75-180 A. Also, using previously published ROSAT data, we estimate a lunar geometric albedo of 0.014% (+/- 0.002%) over the wavelength interval 50-80 A. These EUV albedos (and previously published far-ultraviolet albedos) are well fit by the scaled reflectivities of SiO2 and Al2O3. Over the wavelength ranges of the EUVE photometers, the observed brightness of the Moon seems to be largely consistent with reflected sunlight rather than X-ray fluorescence. Since the L- and M-shell fluorescence signal is expected to be carried by only small number of emission lines, however, it will require EUV observations of higher spectral resolution (approximately less than 5 A) to determine their exact contribution, if any, to the lunar EUV spectrum.
Bowyer Stuart
Boyd William T.
Gladstone Randall G.
McDonald John S.
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