JpGU-AGU Joint Meeting 2017

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[EE] Oral

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

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

Sun. May 21, 2017 1:45 PM - 3:15 PM 105 (International Conference Hall 1F)

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), Chairperson:Atsuki Shinbori(ISEE, Nagoya Univ.), Chairperson:Shin'ya Nakano(The Institute of Statistical Mathematics), Chairperson:Shin-ichiro Oyama(ISEE, Nagoya Univ.)

2:35 PM - 2:50 PM

[PEM14-27] East-west band poleward moving long period (T~2-10 min) auroral pulsations

*Natsuo Sato1,2, Akira S Yukimatu1,2, Yoshimasa Tanaka1,2, Tomoaki Hori,3,4, Akira Kadokura1,2 (1.National Institute of Polar Research, 2.SOKENDAI, 3.Institute for Space-Earth Environment Research, Nagoya University, 4.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo)

Keywords:aurora, east-west band aurora, auroral pulsation, pulsating aurora, magnetosphere-ionosphere coupling, polar region

Using the ground-based all-sky imagers we examined the long period (T~ 2-10 min) east-west band type auroral pulsations which are completely different from well-known pulsating auroras with period of ~ 10 second. Fundamental characteristics of this type of auroral pulsations are as follows: 1) East-west band auroras extending more than 3000km in some cases, 2) Recurrently poleward moving auroral forms, 3) Recurrent periods are ~ 2-10 min, 4) Auroral intensity enhancement, not intensity modulation, 5) Occurrence region is just poleward side of common pulsating aurora, 6) Occurrence local time is post-midnight sector, 7) Aurora luminosity is rather high, sometimes comparable to discrete auroral arcs in the evening sector. We will examine the generation characteristics and mechanisms of this type of auroral pulsations using the multi-instrument ground-based observations and also the date simultaneously observed with instruments onboard spacecraft.