Japan Geoscience Union Meeting 2016

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International Session (Oral)

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

[P-EM07] Dynamics in magnetosphere and ionosphere

Wed. May 25, 2016 9:00 AM - 10:30 AM 103 (1F)

Convener:*Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), 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), Shin'ya Nakano(The Institute of Statistical Mathematics), Tomoaki Hori(Institute for Space-Earth Environmental Research, Nagoya University), Chair:Yoshimasa Tanaka(National Institute of Polar Research)

9:15 AM - 9:30 AM

[PEM07-14] A quantification method for the properties of diffuse and pulsating aurorae based on auroral image data

*Shin'ya Nakano1, Yasunobu Ogawa2 (1.The Institute of Statistical Mathematics, 2.National Institute of Polar Research)

Keywords:pulsating aurora, kalman filter, sparse modelling

The auroral images provide much information on the state of the magnetosphere-ionosphere system. However, since the variations of aurorae are highly complicated, it was difficult to quantify the dynamical properties of the aurorae. We are developing a technique for obtaining quantitative metrics about various auroral properties by analyzing a sequence of auroral images taken with high temporal resolution. We introduce a state space model to describe the translational motion of diffuse aurorae, and estimate the translational velocity by using an algorithm which approximates the Kalman filter. We also extract the features of pulsatingaurora, patches of pulsating aurora by using a technique based on a sparse modelling. We will report some results of our analyses.