DOI: 10.1002/2017JA025110
Scopus记录号: 2-s2.0-85043260959
论文题名: Numerical Study of Traveling Ionospheric Disturbances Generated by an Upward Propagating Gravity Wave
作者: Miyoshi Y. ; Jin H. ; Fujiwara H. ; Shinagawa H.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 3 起始页码: 2141
结束页码: 2155
语种: 英语
英文关键词: atmosphere-ionosphere coupling
; gravity wave
; traveling ionospheric disturbance
英文摘要: Using a global atmosphere-ionosphere coupled model, the characteristics and excitation source of traveling ionospheric disturbances (TIDs) during geomagnetically quiet periods are studied. This is the first paper concerning the simulation of TIDs generated by upward propagating gravity waves (GWs) that are spontaneously generated in the model. The dominant horizontal wavelengths of the simulated TIDs range from 700 to 1,500 km. The dominant periods and horizontal phase velocities of TIDs are 45–90 min and 250–300 m s−1, respectively. These features are the same as those of GWs in the 250–300 km height region. The phase of the electron density variations due to TIDs descends with increasing time, which is characteristic of the upward propagation of GWs. These electron density variations that are caused due to TIDs are explained by the transport processes of a neutral wind along a geomagnetic field line. These results indicate that the electron density variations respond locally to the passage of neutral wind fluctuations associated with upward propagating GWs. The GWs that excite TIDs are secondary GWs, which are generated in the mesosphere and lower thermosphere via the dissipation/breaking of tropospheric GWs. The magnitudes of TIDs at middle latitudes are larger in winter than in summer. The mechanisms of seasonal and day-to-day variations in TIDs that are caused due to GWs are discussed in this study. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114330
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan; National Institute of Information and Communications Technology, Tokyo, Japan; Faculty of Science and Technology, Seikei University, Tokyo, Japan
Recommended Citation:
Miyoshi Y.,Jin H.,Fujiwara H.,et al. Numerical Study of Traveling Ionospheric Disturbances Generated by an Upward Propagating Gravity Wave[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)