Simultaneous observations of nighttime medium-scale traveling ionospheric disturbances and E region field-aligned irregularities at midlatitude
Simultaneous observations of nighttime medium-scale traveling ionospheric disturbances and E region field-aligned irregularities at midlatitude
复制标题
DOI：
10.1029/2005ja011548
复制
发表时间：
2007-06
影响因子：
--
通讯作者：
Y. Otsuka;F. Onoma;K. Shiokawa;T. Ogawa;M. Yamamoto;S. Fukao
中科院分区：
文献类型：
--
作者：
Y. Otsuka;F. Onoma;K. Shiokawa;T. Ogawa;M. Yamamoto;S. Fukao
我们报道了在630nm气辉图像中同时观测到E区场向不规则（FAI）和中尺度旅行电离层扰动（MSTID）的甚高频（VHF）雷达后向散射。2002年8月6日晚，在日本柴垣县的5个波束方向的46.5 mhz中高层大气（MU）雷达在E区观测到典型的FAI准周期（QP）回波。在QP回波事件中，MU雷达站的全天电荷耦合设备成像仪在630 nm气辉图像中检测到MSTID。MSTID也以80 m/s的速度向西南方向传播，波动幅度为背景强度的50%，波长为380 km。在QP回波中，MSTID周期与多普勒速度周期基本一致。MSTID引起的气辉增强（衰减）与QP回波的东南（西北）速度一致。这些结果表明，与F区MSTID相关的电场可以与E区QP回波相关的电场紧密耦合。
[1] We report on simultaneous observations of very high frequency (VHF) radar backscatter from field-aligned irregularities (FAI) in the E region and medium-scale traveling ionospheric disturbances (MSTID) in 630-nm airglow images. On the night of 6 August 2002, the powerful 46.5-MHz middle and upper atmosphere (MU) radar with five beam directions at Shigaraki, Japan, observed typical quasiperiodic (QP) echoes from FAI in the E region. During this QP echo event, an all-sky charge-coupled device imager at the MU radar site detected MSTID in 630-nm airglow images. The MSTID also propagated southwestward at 80 m/s with fluctuation amplitudes of 50% from the background intensity and a wavelength of 380 km. Period of the MSTID was almost same as that of the Doppler velocity in the QP echoes. The airglow enhancement (depletion) caused by the MSTID coincided with southeastward (northwestward) velocity in the QP echo. These results indicate that the electric fields associated with the F region MSTID could be closely coupled to those associated with QP echoes in the E region.