Thermoluminescence of the lunar surface

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Lunar Radiation, Lunar Surface, Thermoluminescence, Earth-Moon System, High Resolution, Polarized Light, Solar Activity Effects, Sunlight

Scientific paper

Data from spectroscopic measurements of variations in the lunar luminescence at the wavelengths 5900 and 7699 A, taken during 1966-69, are analyzed. The analysis consisted of comparison between the line-depth of a Fraunhofer line measured on the direct sunlight and on the sunlight diffused off the lunar surface. Details of the magnetic scanning spectrograph employed for the measurements are presented, noting the attention given to the Na and K resonance lines. Experimental procedures, spectral shift corrections, and corrections for the orbital motion of the earth, the earth diurnal variation, and the gravitational redshift are described. Account is also taken of the effect of the moon orbiting the earth, the variation in the earth-moon distance, and the solar rotation. The measurements verified an increase in the red emission, as was expected from laboratory samples from the moon. Variations in the thermoluminescence were found to depend on the phase angle, with a maximum occurring one day after sunrise.

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