[PEM12-10] 磁気リップルと電子密度の波状構造およびGPS-TEC変動の空間的・時間的関係
キーワード：磁気リップル、電子密度の波状構造、GPS-TEC変動、重力音波
Wavy structures of electron density (Ne) and magnetic ripples observed along the orbit of Swarm satellites in low-latitude on the dayside, and GPS-TEC variation under the orbit are analyzed to see their correlation. Their apparent periods are typically 20-30 seconds, 10-20 seconds and a few minutes, respectively. Near the equatorial region, the APEX latitudes of the region where wavy Ne structure appears and the region traced down from magnetic ripples to 120km altitude, i.e., ionospheric current layer, often coincide suggesting acoustic mode waves as a common source of their generation. Assuming the GPS-TEC variation with a period around a few minutes is temporal variation, we try to check the correlation in the location among the three quantities to check the validity of our idea that the acoustic mode waves are the common source of the variations.