[P-EM16] Coupling Processes in the Atmosphere-Ionosphere System

[PEM16-P28] Statistical Investigation of Variability in Upper Thermospheric Helium from Ground-based Optical Observations at Longyearbyen, Svalbard (78°N), during Two Recent Winter Seasons

*Takanori Nishiyama^1,2, Masato Kagitani³, Takuo T. Tsuda⁴, Noora Partamies⁵, Daniel Whiter⁶, Yasunobu Ogawa^1,2, Fred Sigernes⁵ (1. National Institute of Polar Research, 2. The Graduate University for Advanced Studies, SOKENDAI, 3. Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University , 4. Department of Computer and Network Engineering, University of Electro-Communications , 5. University centre in Svalbard, 6. University of Southampton)

Keywords:Orthohelium, Airglow, Upper thermosphere, Lower exosphere, Svalbard, Ground-based spectroscopy