[PPS05-P06] Enormous cloud cover as seen by Akatsuki/IR2 on the night-side disk of Venus
Keywords:Akatsuki IR2, Venus night-side, Cloud opacity
Although interesting, property of particles in this feature was not studied before due to difficulty of photometric measurements in IR2 night-side data. This difficulty comes from a combination of the intense day crescent and extended tail of IR2 point-spread function (multiple reflection in the detector is the cause). We have developed a technique to restore the contrast of the night-side data by deconvolution so that the photometric studies can be done with IR2 night-side data.
The data acquired on 18th and 27th August 2016 are analyzed. We have performed a series of radiative transfer computations to reproduce both 1.735- and 2.26-um opacities in this enormous cloud. Properties of the cloud partices will be presented and possible mechanism of this remarkable phenomenon will be discussed.