[P-EM10] Dynamics of Magnetosphere and Ionosphere

[PEM10-19] On the improvement of generalized auroral computed tomography

*田中 良昌^1,2,3、小川 泰信^1,2,3、吹澤 瑞貴⁴、坂野井 健⁴、細川 敬祐⁵、津田 卓雄⁵、中野 慎也⁶、門倉 昭^1,2,3 (1.国立極地研究所、2.情報・システム研究機構 データサイエンス共同利用基盤施設 極域環境データサイエンスセンター、3.総合研究大学院大学、4.東北大学大学院理学研究科惑星プラズマ・大気研究センター、5.電気通信大学、6.情報・システム研究機構　統計数理研究所)

キーワード：オーロラ、計算トモグラフィ、逆問題、イメージャネットワーク、欧州非干渉散乱レーダー

We have developed Generalized - Aurora Computed Tomography (G-ACT), which is a method for reconstructing three-dimensional distribution of auroral emission and differential flux of precipitating electrons from multi-instrument data, such as monochromatic images taken at multi-point imager network and ionospheric electron density data from radars. We believe that this method will be more effective when combined with the ionospheric electron density from the next-generation multiple-site phased-array incoherent scatter radar system, EISCAT_3D, which is planned to be operated in January 2023. To apply the G-ACT method to the multiple imager and EISCAT_3D radar data, we are currently improving the method. We present the improvement of the G-ACT method and the effect of the improved method on the reconstruction by simulation. In particular, we focus on the following points; (1) the determination of hyper-parameters including the correction factor for relative sensitivity between imagers, (2) the reconstruction using multi-wavelength monochromatic images, (3) the reconstruction using the electron density data considering its temporal variation, and (4) the validation of the reconstruction result by simulation under realistic conditions. Furthermore, we suggest the data analysis flow separately for discrete arcs and pulsating auroral patches.