Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..248r&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 248-250 (SEE N87-23341 16-91)
Astronomy and Astrophysics
Astronomy
Annual Variations, Mars Surface, Radar Astronomy, Radar Echoes, Radar Scattering, Reflectance, Seasons, Calibrating, Radio Telescopes
Scientific paper
Since reflectivity is a quantity characteristic of a given target at a particular geometry, the same (temporally unchanging) target examined by radar on different occasions should have the same reflectivity. Zisk and Mouginis-Mark noted that the average reflectivities in the Goldstone Mars data increased as the planet's S hemisphere passed from the late spring into early summer. The same data set was re-examined and the presence of the phenomenon of the apparent seasonal variability of radar reflectivity was confirmed. Two objections to these findings are addressed: (1) reflectivity variations may be present in the Goldstone Mars data as a result of an instrument/calibration error; and (2) the variations were introduced into the analysis through comparing reflectivities from two incompatible subsets of the data.
Roth Ladislav E.
Saunders Stephen R.
Thompson William T.
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