High Dispersion Observations of Venus During 1972 The C02 band at 7820A

摘要

Forty-seven veil-exposed photographic plates of Venus which show the spectrum of the carbon dioxide band at 7820A were obtained at Table fountain Observatory in September-October 1972. These spectra showed a seal-regular 4-day variation in the CO. abundance over the disk of the planet (Young et. al. 1974). We also find evidence for temporal variations in the rotational temperature of this band and tecperature variations over the disk. The two quantities, CO2 abundance and temperature, do not show any obvious relationship;however, an increase in the tecperature usually is accompanied by a decrease in the abundance of CO. The average tea-premature, found from a curve of growth analysis assuming a constant CO- line of width, is 249 ± 1.4ºK (one standard deviation). This temperature is noticeably higher than the rotational tecperature of 262 t 2°K found for this same band in 1967 (Schroon et. al. 1969) and of 242 t 1.2°K in 1968-9 (Young et. al. 1971).