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

[PEM12-17] Numerical simulations of metallic ion density perturbations in sporadic E layers caused by gravity waves

*Lihui Qiu^1,2、Yosuke Yamazaki²、Tao Yu¹、Erich Becker³、Yasunobu Miyoshi⁴、Yifan Qi¹、Tarique A Siddiqui²、Claudia Stolle²、Wuhu Feng⁵、Yu Liang¹、Jin Wang¹、Huixin Liu⁴ (1.CUG, China、2.IAP, Germany、3.Northwest Research Associates Inc., Boulder, USA、4.Kyushu Univ. Japan、5.Univ. of Leeds, Uk)

キーワード：sporadic E layer, wind shear, gravity waves

The ionospheric sporadic E (Es) layer is a thin and dense metallic ion layer that occasionally appears at altitudes between 95 and 125 km. The layer-forming process is controlled by the vertical wind shear that is closely linked to the atmospheric tides forced by solar radiation. The diurnal, semidiurnal, terdiurnal and quarterdiurnal variations in the Es layer occurrence rate have been revealed by observations. However, how the gravity wave affects the Es layer has not been well revealed. Using the 1-D Es layer model driven by neutral winds from the HIAMCM model (High Altitude Mechanistic general Circulation Model), this work simulated the physical process of the Es layer evolution modulated by gravity waves. The results show the short-period metallic ion density disturbance (1.5-3h) caused by gravity waves. The sporadic E layer can be destroyed or enhanced by gravity waves.