[P-EM13] Coupling Processes in the Atmosphere-Ionosphere System

[PEM13-P05] Test observations by low-cost small all-sky imagers for multi-point measurements of airglow at middle and low latitudes

*Kazuo Shiokawa¹, Yuka Yamamoto¹, Takumi Adachi¹, Kouki Kawai¹, Kohki Nakamura¹, Jie Liu¹, Liwei Chen¹, Yuto Kato¹, Takuma Tsuboi¹, Sato Masaki¹, Rei Sugimura¹, Tomoka Oonishi¹, Kohei Toyama¹, Kazuki Nomura¹, Yoshizumi Miyoshi¹, Yasunobu Ogawa², Mitsumu K. Ejiri², Keisuke Hosokawa³, Shin Suzuki⁴, Takeshi Sakanoi⁵ (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.National Institute of Polar Research, 3.The University of Electro-Communications, 4.Aichi University, 5.Tohoku University)

Keywords:airglow, low-cost camera, instrumental development

We are developing low-cost small all-sky imagers for measurements of airglow at middle and low latitudes. The imagers consist of a CCD camera (WATEC WAT-910HX) with a fish-eye lens Fujinon FE1185C057HA-1 and band-bass filters with bandwidths of ~10 nm (Ogawa et al., 2020). This camera succeeded to obtain plasma bubble images using a 630-nm filter (Hosokawa et al., 2020). From test observations at Shigaraki, Japan (34.8N, 136.1E), in August 2021, we also obtain mesospheric gravity wave images using a 557.7-nm filter. We are also testing a CMOS camera (ZWO ASI294MM Pro) as a detector of all-sky imagers of Optical Mesosphere Thermosphere Imagers (OMTIs, Shiokawa et al., 1999). This set of OMTI optics (KEO Sentry 3) with the ZWO camera succeeded to obtain images of gravity waves at 557.7-nm and medium-scale traveling ionospheric disturbances at 630.0 nm at Sata, Japan (31.0N, 130.7E). In addition, three sets of the Fujinon lens and the ZWO camera are tested at Shigaraki, Japan, since January 22, 2022, for airglow measurements in 557.7 nm, 630.0 nm, and OH-band emissions. These CCD and CMOS cameras cost US$1000-2000, which is 20-40 times cheaper than the previous cooled-CCD camera used for OMTIs. We plan to distribute these low-cost small all-sky imagers in Europe, Asia, and Africa to make multi-point measurements of airglow images at middle and low latitudes.

Ogawa et al. (Polar Sci., 2020, https://doi.org/10.1016/j.polar.2019.100501)
Hosokawa et al. (EPS, 2020, https://doi.org/10.1186/s40623-020-01187-1)
Shiokawa et al. (EPS, 1999, https://doi.org/10.1186/BF03353247)