Oral comunication
R. Gonçalves, P. Machado, T. Widemann, J. Peralta, S. Watanabe, A. Yamazaki, T. Satoh, M. Takagi, K. Ogohara, Y. J. Lee, A. Harutyunyan, J. Silva
Abstract
We present wind velocity results based in the measurements of the horizontal wind field at the cloud top level of the atmosphere of Venus, near 70 km altitude, in the visible range on the dayside. The cloud-tracking space observations were carried out, between 26-31 January 2017, by the "Ultra Violet Imager" (UVI) onboard Akatsuki's Venus Climate Orbiter (VCO), using the 365 nm filter, which tracks UV cloud features at about 68-71 km. The cloud-tracking technique we used was evolved from a phase correlation method between images developed by Peralta et al. 2007. The use of UVI images to track cloud features from the unknown UV absorber has already provided important results in the constrain of zonal and meridional wind at cloud-top. Venus Climate Orbiter "Akatsuki" is currently the only spacecraft operating around Venus. Due to its low inclination orbit (<10 deg), Akatsuki's images offer a great range in Venus' dayside, allowing us to track cloud features from 60 deg N to 70 deg S latitude and from 7:30 to 17:00 local time - this has enable a study of spatial and time variability of the wind. The ground observations probed the cloud top layer (70km altitude) using the Doppler velocimetry technique, enabling a cross-validation with Akatsuki cloud-tracking technique.
European Planetary Science Congress 2018
Berlin, Germany
2018 September
