HF radar observations of high-aspect angle backscatter from the E-region
HF radar observations of high-aspect angle backscatter from the E-region
复制标题
高频雷达对 E 区高方位角反向散射的观测
DOI：
10.5194/angeo-22-829-2004
复制
发表时间：
2004
影响因子：
1.9
通讯作者：
J. Villain
中科院分区：
文献类型：
--
作者：
S. Milan;M. Lester;T. Yeoman;T. Robinson;M. Uspensky;J. Villain
抽象的。我们提出的证据观测的高视角高频雷达后向散射极光电喷流，并描述这些回波的光谱特性。这种后向散射是在电离层折射不足以使探测无线电波与磁场正交的非常近的范围内观察到的;这种传播效应的频率依赖性与CUTLASS冰岛雷达的立体声升级进行了研究。我们将这种回波的出现称为“高纵横角不规则区域”或HAIR。结果表明，在高达30°的方位角下观察到后向散射，方位灵敏度低至1dB deg-1。这些回波区别于正常的电射流反向散射具有低多普勒频移与方位角的依赖性，出现更一致的对流电场的方向比预期的电子漂移方向。这是讨论的线性理论色散关系的电射流波。关键词。电离层（电离层不规则性;等离子体波和不稳定性;极光电离层）
Abstract. We present evidence for the observation of high-aspect angle HF radar backscatter from the auroral electrojets, and describe the spectral characteristics of these echoes. Such backscatter is observed at very near ranges where ionospheric refraction is not sufficient to bring the sounding radio waves to orthogonality with the magnetic field; the frequency dependence of this propagation effect is investigated with the Stereo upgrade of the CUTLASS Iceland radar. We term the occurrence of such echoes the "high-aspect angle irregularity region" or HAIR. It is suggested that backscatter is observed at aspect angles as high as 30°, with an aspect sensitivity as low as 1dB deg –1 . These echoes are distinguished from normal electrojet backscatter by having low Doppler shifts with an azimuthal dependence that appears more consistent with the direction of the convection electric field than with the expected electron drift direction. This is discussed in terms of the linear theory dispersion relation for electrojet waves. Key words. Ionosphere (ionospheric irregularities; plasma waves and instabilities; auroral ionosphere)
DOI：
--
发表时间：
2003
期刊：
Ann.Geophys. 21
影响因子：
--
作者：
Milan;S.E.;et al.
通讯作者：
et al.