||SMILES observations of mesospheric ozone during the solar eclipse
Imai, Koji ,
Imamura, Takashi ,
Takahashi, Kenshi ,
Akiyoshi, Hideharu ,
Yamashita, Yousuke ,
Suzuki, Makoto ,
Ebisawa, KenShiotani, Masato
Geophysical Research Letters
3582 , 2015-05-07 , American Geophysical Union
日食を利用して太陽光が大気中のオゾンへ与える影響を調査. 京都大学プレスリリース. 2015-06-16.
The Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) successfully observed vertical distributions of ozone (O) concentration in the middle atmosphere during the annular solar eclipse that occurred on 15 January 2010. In the mesosphere, where the photochemical lifetime of O is relatively short (approximately 100 s), altitude-dependent changes in O concentration under reduced solar radiation and their temporal variations were clearly observed as a function of the eclipse obscuration. This study reports the vertical distributions of mesospheric O during a solar eclipse event and analyzes theoretically the eclipse-induced changes. We show that simple analytical expressions for O concentration, which assume that O and O are in a photochemically steady state, can be used to describe the O concentration under reduced solar radiation. The SMILES data obtained during the eclipse provide a unique opportunity to test our current understanding of mesospheric O photochemistry.