講演情報
[PEM14-P15]Global mapping of ionospheric plasma velocity distributions using spherical elementary current systems based on SuperDARN data
*中野 慎也1、堀 智昭2、関 華奈子2、西谷 望3 (1.情報・システム研究機構 統計数理研究所、2.東京大学大学院理学系研究科、3.名古屋大学宇宙地球環境研究所)
We have developed a method for estimating the global distribution of ionospheric plasma velocity from the SuperDARN data. The SuperDARN observations have a wide spatial coverage. However, it is difficult to obtain a global ionospheric convection map from the SuperDARN data because individual radars give only line-of-sight components of plasma drift velocity and the data are frequently missing. In our technique, the plasma velocity distribution is represented by a sum of divergence-free spherical elementary current systems, which provides a constraint ensuring the divergence free condition. In this paper, we will demonstrate a preliminary results obtained by our newly developed method.