Imaging spectroscopy of the Venus 1.27-μm O2 airglow with ground-based telescopes |
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| Authors: | S Ohtsuki N Iwagami H Sagawa M Ueno Y Kasaba T Imamura E Nishihara |
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| Institution: | 1. University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;2. University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo 153-8902, Japan;3. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan;4. Gunma Astronomical Observatory, 6860-86, Nakayama, Takayama-mura, Agatsuma-gun, Gunma 377-0702, Japan |
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| Abstract: | Several ground-based observations of the Venus 1.27-μm O2 airglow were carried out from 2002 to 2005. Spectral image cubes were taken with the Okayama Astrophysical Observatory/infrared imaging spectrometer (superOASIS), the Gunma Astronomical Observatory/Cassegrain Near-Infrared Camera and NASA’s Infrared Telescope Facility/cryogenic echelle spectrograph (CSHELL). The brightest airglow features were found at around the anti-solar point, which is in agreement with previous studies. We derived the rotational temperature distributions on the nightside hemisphere from observed airglow spectra. The temperature shows a weak positive correlation with the airglow intensity. The result indicates the bright region is heated chemically and/or dynamically, and supports the existing scenario for the Venus O2 airglow. That is, the airglow is excited by the descending oxygen transported from the dayside. |
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| Keywords: | Venus Airglow Ground-based observation Near infrared Spectroscopy Rotational temperature |
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