Mathematics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975dsn..nasa...70y&link_type=abstract
In its The Deep Space Network p 70-87 (SEE N76-15190 06-12)
Mathematics
Earth (Planet), Earth Ionosphere, Mathematical Models, Daytime, Ionospheric Propagation, Mariner Venus-Mercury 1973, Night, Superhigh Frequencies
Scientific paper
A new global ionospheric model was successfully implemented. The daytime portion of this model provides one-way ionospheric range corrections that compare favorably with those derived from the Mariner Venus/Mercury S- and X-band dual frequency Doppler data. For elevation angles, gamma higher than 30 deg and solar zenith angle less than 80 deg, this model provides calibrations accurate to a few centimeters. The calibrations provided by the nighttime model are also very reasonable. It is interesting to note that the daytime ionospheric calibrations derived from the current calibration scheme, DIEN/TIEN, are fairly close to those given by the new global model, especially in the temporal variations and thus the Doppler effects. The comparison between the nighttime model and DIEN/TIEN was based on the one-way ionospheric range corrections for three passes near the Mariner 9 encounter with Mars in 1971. They can differ by over 30%.
Vonroos O. H.
Yip K. W.
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