Development of low-cost multi-wavelength imager system for studies of aurora and airglow
Ogawa, Y.; Tanaka, Y.; Kadokura, A.; Hosokawa, K.; Ebihara, Y.; Motoba, T.; Gustavsson, B.; Brändström, U.; Sato, Y.; Oyama, S.; Ozaki, M.; Raita, T.; Sigernes, F.; Nozawa, S.; Shiokawa, K.; Kosch, M.; Kauristie, K.; Hall, C.; Suzuki, S.; Miyoshi, Y.; Gerrard, A.; Miyaoka, H.; Fujii, R. (2019-12-16)
Y. Ogawa, Y. Tanaka, A. Kadokura, K. Hosokawa, Y. Ebihara, T. Motoba, B. Gustavsson, U. Brändström, Y. Sato, S. Oyama, M. Ozaki, T. Raita, F. Sigernes, S. Nozawa, K. Shiokawa, M. Kosch, K. Kauristie, C. Hall, S. Suzuki, Y. Miyoshi, A. Gerrard, H. Miyaoka, R. Fujii, Development of low-cost multi-wavelength imager system for studies of aurora and airglow, Polar Science, Volume 23, 2020, 100501, ISSN 1873-9652, https://doi.org/10.1016/j.polar.2019.100501
© 2019 Elsevier B.V. and NIPR. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2020051229615
Tiivistelmä
Abstract
This paper introduces a new system that can monitor aurora and atmospheric airglow using a low-cost Watec monochromatic imager (WMI) equipped with a sensitive camera, a filter with high transmittance, and the non-telecentric optics. The WMI system with 486-nm, 558-nm, and 630-nm band-pass filters has observable luminosity of about ~200–4000 Rayleigh for 1.07-sec exposure time and about ~40–1200 Rayleigh for 4.27-sec exposure time, for example. It is demonstrated that the WMI system is capable of detecting 428-nm auroral intensities properly, through comparison with those measured with a collocated electron-multiplying charge-coupled device (EMCCD) imager system with narrower band-pass filter. The WMI system has two distinct advantages over the existing system: One makes it possible to reduce overall costs, and the other is that it enables the continuous observation even under twilight and moonlight conditions. Since 2013 a set of multi-wavelength WMIs has been operating in northern Scandinavia, Svalbard, and Antarctica to study meso- and large-scale aurora and airglow phenomena. Future development of the low-cost WMI system is expected to provide a great opportunity for constructing a global network for multi-wavelength aurora and airglow monitoring.
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