Japan Geoscience Union Meeting 2016

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

[P-EM18] Dynamics in magnetosphere and ionosphere

Wed. May 25, 2016 1:45 PM - 3:15 PM 103 (1F)

Convener:*Tomoaki Hori(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), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Chair:Tetsuo MOTOBA(Nagoya University), Yuki Obana(Department of Engineering Science, Faculty of Engineering, Osaka Electro-Communication University)

1:45 PM - 2:00 PM

[PEM18-07] Ion cyclotron waves detected by Kaguya and Geotail in the Earth’s plasma sheet boundary layer

*Tomoko Nakagawa1, Hideo Tsunakawa2 (1.Information and Communication Engineering, Tohoku Institute of Technology, 2.Deparment of Earth and Planetary Sciences, Tokyo Institute of Technology)

Keywords:ion cyclotron wave, plasma sheet boundary layer, lobe, Kaguya, GEOTAIL, left-handed polarization

Nearly monochromatic, narrowband ion cyclotron waves found by Apollo 15 and 14 Lunar Surface Magnetometers (Chi et al., 2013) were detected in the magnetic field data obtained by GEOTAIL in the distant tail lobe as well as in the data obtained by Kaguya orbiting around the moon in the tail lobe of the Earth’s magnetosphere. They have common characters such as the frequency range near the local proton cyclotron frequency, significant compressional components, and wave forms comprising discrete packets. They are also similar to the waves found by Cassini during its Earth swing-by (Bogdanov et al., 2003). Polarization of the narrowband ion cyclotron waves was predominantly left-handed at far downstream, while near the lunar orbit, both right-handed and left-handed polarization was detected.