Japan Geoscience Union Meeting 2014

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Oral

Symbol P (Space and Planetary Sciences) » P-CG Complex & General

[P-CG38_1AM2] Planetary atmosphere, ionosphere and magnetosphere

Thu. May 1, 2014 11:00 AM - 12:45 PM 423 (4F)

Convener:*Takeshi Imamura(Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science), Kanako Seki(Solar-Terrestrial Environment Laboratory, Nagoya University), Yukihiro Takahashi(Department of Cosmosciences, Graduate School of Science, Hokkaido University), Yoshiyuki O. Takahashi(Center for Planetary Science), Keiichiro Fukazawa(Research Institute for Information Technology,Kyushu University), Hiromu Nakagawa(Planetary Atmosphere Physics Laboratory, Department of Geophysics, Graduate School of Science, Tohoku University), Chair:Takeshi Imamura(Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science)

11:30 AM - 11:45 AM

[PCG38-10] Studying the Venusian atmosphere on the 2012 transit of Venus

*Miho KANAO1, Masato NAKAMURA1, Toshifumi SHIMIZU1, Takeshi IMAMURA1 (1.ISAS/JAXA)

Keywords:planetary atmosphere, the transit of Venus

The solar satellite Hinode observed the transit of Venus on June 5-6th 2012. The solar optical telescope (SOT) observed the dark Venus disk against the bright solar surface. The images were acquired continuously for the wavelength of 396.8, 430.5 450.4, 555.0, 668.4 nm with unprecedented spatial scale (〜0.3 arcsec).The purpose is the derivation of the latitudinal and vertical distribution of the cloud particle, SO2 and SO from the transmittance for considering the global dynamics. We calculated the transmittance normalized by the unattenuated solar intensity after the data correction processes including the removal of the solar limn darkening and the calibration for the plate scale.The altitude as the transmittance of 0.5 (〜90 km) in the Venus atmosphere has the slant toward the equator. The difference is 9.1 km in the evening and 6.1 km in the morning. In the equatorial region (latitude ≤ 40 degree), the fluctuation of the altitude is observed. The amplitude for the wavelength shorter than 400 nm is a few times larger than that of 430.5 nm. We would show the consideration to explain the longitudinal distribution of the altitude of the Venus disk.