2:45 PM - 3:00 PM
[PCG23-11] Short and medium/long-term CO variations of the Venusian middle atmosphere observed by the SPART telescope
Keywords:Mm/submm-wave band heterodyne spectroscopy, Terrestrial planets, Atmospheric chemistry, Solar activity, Venus
The medium/long-term data observed in the last 8 years showed that the Venusian night-side averaged CO mixing ratios at an altitude of about 80 km were at low level of ~ 60 ppmv. We also found the medium-term anti-correlation between the CO mixing ratio and the Solar ultraviolet radiation at 199.5 nm wavelength and short-term (several days/months) changes of the CO mixing ratio. These phenomena are considered to be induced by solar activities and the circulations of the chemical substances driven by the intrinsic dynamics of Venus.
In this conference we will present these results observed with SPART.