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Diurnal cycles of soil temperature and heat flux measured on the Pampa de La Joya, Peru are analyzed harmonically. A theory of thermal diffusion put forth by H. H. Lettau (1962) is used to determine the relative calibration of the soil heat flux plates and the relative depth intervals between the flux plates in comparison with the soil temperature profile. The absolute value of the soil heat flux is based on an allowed range of values for the density of the soil.
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Charles R. Stearns (1969) studied this question.
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