JpGU-AGU Joint Meeting 2020

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

[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

convener:Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Yue Deng(University of Texas at Arlington), Loren Chang(Institute of Space Science, National Central University)

[PEM12-P45] Overview of Vertical Incidence Pulsed Ionospheric Radar 2 (VIPIR2) observation in Japan

*Michi Nishioka1, Hideo MAENO1, Hiroyuki YAMAKAWA1, Takumi Kondo1, Takuya Tsugawa1, Mamoru Ishii1 (1.National Institute of Information and Communications Technology)

Keywords:VIPIR2, ionosonde, ionosphere, arraival angle, manual scaling, machine learning

National Institute of Information and Communications Technology (NICT) has been observing ionosphere by ionosondes for over 70 years in Japan. In 2017, we replaced the previous ionosondes with Vertical Incidence Pulsed Ionospheric Radar 2 (VIPIR2) ionosondes, which is mainly developed in NOAA. VIPIR2s are automatically operated at four stations at Wakkanai (Sarobetsu), Kokubunji, Yamagawa, Okinawa (Ogimi). In the presentation, we give an overview of our system and introduce some recent topics on our observation: 1. Estimation of arrival directions of received echo, and 2. Improvement of automatic scaling method. For estimation of arrival directions, two methods of Fourie imaging and Capon method are tried. These methods are confirmed by using data of oblique sounding. For the improvement of automatic scaling, we apply one of machine learning techniques and construct a model for scaling. The accuracy of some parameters is improved.