| IMF Bz周期震荡期间日间热层扰动风的经度差异分析 |
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| 引用本文： | 张科灯,王慧,王文斌,刘晶,高洁. IMF Bz周期震荡期间日间热层扰动风的经度差异分析[J]. 地球物理学报, 2022, 65(3): 843-852. DOI: 10.6038/cjg2022P0397 |
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| 作者姓名： | 张科灯 王慧 王文斌 刘晶 高洁 |
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| 作者单位： | 武汉大学电子信息学院空间物理系,武汉430072,美国大气研究中心高山天文台,博尔德80307,山东大学空间科学与物理学院,山东威海264209 |
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| 基金项目： | 中央高校基本科研业务费专项资金(2042021kf0208);国家自然科学基金(41974182,41674153,42004135);中国博士后科学基金会项目(2020M682465)共同资助。 |
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| 摘 要： | 基于磁层-电离层-热层耦合模型(Coupled Magnetosphere-Ionosphere-Thermosphere Model,CMIT),本文探究了当行星际磁场Bz分量(Interplanetary magnetic field,IMF) 60 min周期震荡时,白天热层扰动风的经度差异特征.由于地磁构型、热...
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| 关 键 词： | 热层扰动风 经度响应差异 IMF Bz周期震荡 |
Longitudinal variations of noontime thermospheric winds in response to IMF Bztemporal oscillations:broken mean circulation and standing feature |
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| ZHANG KeDeng,WANG Hui,WANG WenBin,LIU Jing,GAO Jie. Longitudinal variations of noontime thermospheric winds in response to IMF Bztemporal oscillations:broken mean circulation and standing feature[J]. Chinese Journal of Geophysics, 2022, 65(3): 843-852. DOI: 10.6038/cjg2022P0397 |
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| Authors: | ZHANG KeDeng WANG Hui WANG WenBin LIU Jing GAO Jie |
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| Affiliation: | (Department of Space Physics,School of Electronic Information,Wuhan University,Wuhan 430072,China;High Altitude Observatory,National Center for Atmospheric Research,Boulder 80307,USA;School of Space Science and Physics,Shandong University,Weihai Shandong 264209,China) |
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| Abstract: | By using the coupled magnetosphere-thermosphere-ionosphere model,we explore the longitudinal dependences of the dayside neutral wind in response to the 60 min periodic oscillation of the interplanetary magnetic field(IMF)Bz.The southward propagation of the traveling atmospheric disturbances(TADs)in meridional wind stands at about 20°MLat,which is related to the geomagnetic field configuration,neutral temperature,and electron density changes.The meridional wind travels continuously from high to low latitude in the western southern hemisphere,with several sudden changes in the wave phase along the propagation direction.The sudden changes in the wave phase that is induced by the interaction between TADs and simultaneous responses of the meridional winds driven by oscillating solar wind conditions is induced by the stronger roles of the ion drag than the pressure gradient,with the magnitudes of acceleration in meridional winds due to ion drag and pressure gradient are-4 and 3 cm·s-2,respectively.Note here that the mean circulation is the background meridional winds in the base case with the IMF Bzsetting to zero in the CMIT model.The ion drag shows obvious longitudinal differences associated with the penetration of the ionospheric electric field during the oscillation of IMF Bz. |
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| Keywords: | Periodic oscillation of IMF Bz Thermospheric disturbance winds Longitudinal differences |
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