Observational evidence of coupling between quasi-periodic echoes and medium scale traveling ionospheric disturbances
Observational evidence of coupling between quasi-periodic echoes and medium scale traveling ionospheric disturbances
复制标题
DOI：
10.5194/angeo-25-2185-2007
复制
发表时间：
2007-11
影响因子：
1.9
通讯作者：
S. Saito;M. Yamamoto;H. Hashiguchi;A. Maegawa;A. Saito
中科院分区：
文献类型：
--
作者：
S. Saito;M. Yamamoto;H. Hashiguchi;A. Maegawa;A. Saito
摘要。我们发现，当F区存在中尺度行波电离层扰动（MSTIDs）时，E区的准周期（QP）回波能被很好地界定。利用密集的全球定位系统（GPS）接收器网络观测到的MSTIDs的出现和消失，与利用中高层大气（MU）雷达观测到的QP回波的发展和衰减密切相关。利用MU雷达获得的QP回波的干涉成像显示，回波区域带从西北向东南排列，向西南方向漂移，其波前和传播方向与MSTIDs相同。这一结果证实了海塞尔等人（2002年）的预期，他们利用MU雷达观测到了QP回波中的带状结构，并提出了它们与MSTIDs的关系。我们发现了观测证据，表明中纬度的E区和F区通过地磁场线耦合，尽管我们无法明确确定这两个区域中哪一个是源区。
Abstract. We have found that quasi-periodic (QP) echoes in the E region were well defined when medium scale traveling ionospheric disturbances (MSTIDs) in the F region were present. The appearance and disappearance of the MSTIDs observed with the dense GPS receiver network are well correlated with the development and decay of QP echoes observed with the Middle-and-Upper atmosphere (MU) radar. Interferometric imaging of the QP echoes obtained using the MU radar shows that bands of echoing regions aligned northwest to southeast drift southwestward, and their wavefront and propagation direction are the same as those of MSTIDs. This result confirms the expectation of Hysell et al. (2002) who observed band structures in QP echoes by using the MU radar and suggested their relation to MSTIDs. We found observational evidence that the midlatitude E- and F regions are coupled through the geomagnetic field line, although we could not clearly ascertain which of the two regions is the source.