[P-PS04] あかつきの成果と、金星科学の深化

[PPS04-P05] Fine vertical structure of Venus upper haze as revealed in Akatsuki/IR2 limb images.

*佐藤 毅彦^1,2、佐藤 隆雄¹ (1.宇宙航空研究開発機構・宇宙科学研究本部、2.総合研究大学院大学)

キーワード：リム観測、金星上層ヘイズ、近赤外線

Akatsuki observes Venus from an elongated elliptical orbit (an orbital period is ~11 earth days). Since this orbit receives strong purturbation by the sun's gravitaion, the peri-center distance from Venus fluctuates. On 30 October 2016, when the spacecraft is near the peri-center (~8200 km from the center of Venus), limb observations were carried out with onboard cameras. IR2 captured Venus limb images at 2.02-micron and detected a step-like intensity variation of the upper haze at the limb. The image indicates existence of approximately 6-pixel (or ~7 km) wide vertical structure at the planetary limb. By correcting for the IR2 point-spread function, we discuss the vertical aerosol structure (number density and scale height) in the upper atmosphere.