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Ca+ ion layer observed by a resonance scattering lidar at Syowa in the Antarctic

Authors

Ejiri,  Mitsumu K.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nishiyama,  Takanori
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tsuda,  Takuo T.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tsutsumi,  Masaki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tsuno,  Katsuhiko
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Makoto,  Abo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Takuya D,  Kawahara
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ogawa,  Takayo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Satoshi,  Wada
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nakamura,  Takuji
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Ejiri, M. K., Nishiyama, T., Tsuda, T. T., Tsutsumi, M., Tsuno, K., Makoto, A., Takuya D, K., Ogawa, T., Satoshi, W., Nakamura, T. (2023): Ca+ ion layer observed by a resonance scattering lidar at Syowa in the Antarctic, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4260


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021697
Abstract
Layers of metal ions in the mesosphere and lower-thermosphere (MLT) are produced by meteoric ablation. The meteoric metal ions have relatively long chemical lifetime in the MLT region and behave as plasma affected by neutral atmosphere dynamics. Ca+ is one of meteoric metal ion and only one ion, which can be measured its vertical profile from the ground by a lidar sounding. Ca+ lidar observations have been conducted at the low and mid latitudes in the northern hemisphere only. A resonance scattering lidar developed by the National Institute of Polar Research (NIPR) was installed at Syowa (69S, 40E), Antarctic in 2017 and successfully obtained Ca+ density profiles 6 nights in total in Spring of 2017 and 2018. The averaged Ca+ layer observed at Syowa were with a FWHM of ~7 km, peak altitude of ~94 km, and peak density of ~10 cm-3. The Ca+ layers were observed in the main supply height region by meteor, however the layer was not always existing but sometimes disappeared. Temporal variation of Ca+ density is compared with meteoric, geomagnetic, and gravity wave activities. In this presentation, we will discuss a main reason of Ca+ layer disappearance with considering chemical lifetime of Ca+ below 100 km.