Statistics – Computation
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986tdar.nasa..291s&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 291-299 (SEE N87-15329 07-32)
Statistics
Computation
Deep Space Network, Dust Storms, Mars Atmosphere, Microwave Attenuation, Mie Scattering, Particle Size Distribution, Extremely High Frequencies, Microwave Emission, Ultrahigh Frequencies
Scientific paper
Independent studies of attenuation of X-band (8.5 GHz) and Ka-band (32 Ghz) radio signals when traversing Martian dust were carried out. These analyses turned out remarkably similar. The computational method is essentially that of T. S. Chu but uses observed optical depth at 0.67 microns rather than visibility as the measure of optical attenuation from which to derive the microwave attenuation. An awkwardness in the approach is that the size distribution of Martian dust particles is not well known, but the mean is probably around 4 microns, whereas in the terrestrial case it is nearer 10 microns. As a consequence, there will be a larger tail of particles still in the Mie regime in the Martian case as compared to the terrestrial one. The computational error will, therefore, be somewhat larger for Martian than Earth-bound dust. Fortunately, the indicated attenuations are small enough for the worst case (1.3 dB at 32 GHz) that the error is academic.
Flock W. L.
Smith Karen E.
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