Japan Geoscience Union Meeting 2019

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[E] Poster

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

[P-EM11] Dynamics of Magnetosphere and Ionosphere

Wed. May 29, 2019 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener: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), Akiko Fujimoto(Kyushu Institute of Technology), Tomoaki Hori(Institute for Space-Earth Environmental Research, Nagoya University)

[PEM11-P20] Optical and radar observation of the dynamic auroral forms

*Yunosuke Nagafusa1, Tima Sergienko2, Satoshi Taguchi1, Urban Braendstroem2, Masatoshi Yamauchi2 (1.Graduate School of Science, Kyoto University, 2.Swedish Institute of Space Physics, Kiruna)

Keywords:aurora, ionospheric parameters, electron precipitations

Ionosphere disturbances caused by the auroral electron precipitations are studied using auroral images taken by Auroral Large Imaging System (ALIS) and ionospheric parameters measured by EISCAT UHF radar that were conjugate with ALIS field-of-view. ALIS consists of several remote controlled stations located in northern Scandinavia, separated by approximately 50 km. Each station is equipped with a high-resolution CCD detector with 1024×1024 pixels, and a filter wheel with six positions for narrow-band interference filters. In this study we use the data obtained with the 557.7 nm filter, which show the auroral emission originated from the atomic oxygen. EISCAT UHF radar located in northern Norway near Tromsø operating in the BEATA program provides the ionospheric electron density, electron and ion temperatures, and ion velocity with the time resolution of 5 s and the spatial resolution of 1.5 km. The auroral images from the different ALIS stations were used for triangulation of the auroral forms in order to determine the aurora position in relation to the radar beam. For each auroral arc, the electron density, the electron and ion temperatures measured inside and in the vicinity of the auroral forms were analyzed with the aim of understanding the ionospheric response to the different types of auroral electron precipitations.