[P-CG21] Planetary atmosphere, ionosphere and magnetosphere

[PCG21-P04] Development of Fiber IFU for Venus Cloud Tops

*Manabu Yamada¹, Masato Kagitani³, Atsushi Yamazaki² (1.Planetary Exploration Research Center, Chiba Institute of Technology, 2.Institute of Space and Astronautical Science / Japan Aerospace Exploration Agency, 3.Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University)

Keywords:Fiber integral field units, Ultraviolet observation, Venus atmosphere

Venus cloud absorbs solar radiation at wavelength between 200nm and 500nm. The absorption of wavelength between 200nm and 320nm is well explained by SO₂ at the cloud tops, but the absorption at longer wavelength has not been identified yet. The comparison between the spatial features of different wavelength may clarify number of unknown-absorbers, but only one bandpass filter or one wideband filter with transmittance around 365nm has been used by telescopes and instruments of previous observation.
We are developing a spectrum imaging instrument using fiber array. Spectrum imaging can take several images of different wavelength at same time, and it is suitable for studying the UV-blue absorber of Venus. We thought a new manufacturing method of a fiber array with several hundred of fiber with diameter of ~100μm, and improvement has been added to the method for practical use. Optics using the fiber array are designed for Haleakala 60-cm. We will report performance of our instrument and plan to observation of Venus.