JpGU-AGU Joint Meeting 2017

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[EE] Poster

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM14] [EE] Dynamics in magnetosphere and ionosphere

Sat. May 20, 2017 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall HALL7)

convener:Tomoaki Hori(Graduate school of Science, University of Tokyo), Yoshimasa Tanaka(National Institute of Polar Research), Aoi Nakamizo(Applied Electromagnetic Research Institute, National Institute of Information and Communications Technology), Mitsunori Ozaki(Faculty of Electrical and Computer Engineering, Institute of Science and Engineering, Kanazawa University)

[PEM14-P33] Characteristics of pulsating aurora modulation observed from high-speed EMCCD camera

*asano takaki1, Yoshizumi Miyoshi1, Satoshi Kurita1, Shin-ichiro Oyama1, Keisuke Hosokawa2, Yasunobu Ogawa3, Takanori Nishiyama3, Shinobu Machida1 (1.Institute for Space-Earth Environmental Research, ISEE, Nagoya University., 2.Department of Communication Engineering and Informatics, University of Electro-Communications, 3.National Institute of Polar Research)

Keywords:aurora

Pulsating aurora (PsA) shows quasi-periodic intensity modulation with a 2 s to 30 s intervals as a main modulation. PsA is mainly observed from the post-midnight to the morning sectors during the recovery phase of substorms. PsA consists of not only main modulations but also internal modulation with a few Hz. We installed multi-EMCCD cameras in Tromso, Finland, Sodankyla, Kevo Finland and Alaska, US. The cameras with RG665 filters observe high-speed phenomena with 100 Hz sampling rate, while the cameras with different filters observe spectrum of PsA with 10 Hz sampling rate. In order to investigate spatio-temporal characteristics of the main modulations as well as internal modulations, we apply PCA (Principal Component Analysis) and FFT to all-sky images of PsA with 100 Hz sampling rate. PCA decomposes into different modes with periods of a few seconds, indicating that localized structure of the main modulation of PsA. The all-sky images at different frequency derived from FFT show that the spatial distribution of PsA depends on the frequency and the internal modulations with high frequency appear in a part of the main modulations. In this presentation, we will report statistical results on these spatio-temporal characteristics of PsA.