The Reagan Radiometer Archive contains calibrated reduced data record (RDR) optical depth data acquired by the Reagan Sunphotometer during the earth-based 1989 Geologic Remote Sensing Field Experiment (GRSFE).

Citation Bruegge, C. J., FIELD EXP E REAG CALIBRATED RDR OPTICAL DEPTH V1.0, FEXP-E-REAG-3-RDR-OPT-DEP-V1.0, NASA Planetary Data System, 1991
Digital Object Identifier (DOI) 10.17189/1519459
Data Set Abstract This data set consists of optical depth measurements made using the the Reagan Radiometer (acquired data in July 17 and September 29, 1989 at Lunar Lake). Total instantaneous optical depth was obtained from the data through use of Beer's Law, as follows. The set of observations for one channel are plotted as natural logarithm of instrument voltage versus secant of incidence angle (i.e., Langley Plot). This allows one to solve for the equivalent instrument voltage that would be obtained above the atmosphere (the plot intercept) and the optical depth (the plot slope). Instantaneous optical depths were then derived by using this intercept and solving for optical depth using pairs of voltage values acquired close together in time.
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    Additional Information
    Data Set Information FEXP-E-REAG-3-RDR-OPT-DEP-V1.0
    Instrument Host Information FEXP
    Instrument Information REAG
    Target Information EARTH