Climatology of gravity waves-induced electric fields in the equatorial E region
Climatology of gravity waves-induced electric fields in the equatorial E region
复制标题
赤道E区重力波诱发电场的气候学
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
M. Abdu
中科院分区：
文献类型：
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作者：
H. Aveiro;C. Denardini;M. Abdu
[1]赤道电射流（EEJ）观测使用VHF雷达显示后向散射回波从两种类型的电子密度的不规则性解释的修改后的双流（I型）和梯度漂移（II型）的不稳定性。根据安装在圣路易斯空间天文台（2.58°S，44.23°W，磁纬0.23°S）的雷达获得的II型不规则速度，我们推断了垂直电场（Ez）。Ez推断是基于地磁场和大气模型。这些电场的谐波分析表明存在重力波（GW）引起的EEJ振荡。我们计算了GW相关的电场和总Ez之间的比率，这是由于重力波中性风产生额外电场的效率的指标。在本文中，我们描述的分析方法，并讨论了重力波的一些特性，可以修改赤道电离层电场。
[1] Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type II) instabilities. From the Type II irregularity velocities obtained by a radar installed at Sao Luiz Space Observatory (2.58°S, 44.23°W, magnetic latitude 0.23°S) we have inferred the vertical electric fields (Ez). The Ez inference was based on geomagnetic field and atmospheric models. A harmonic analysis of these electric fields shows the presence of gravity waves (GW) induced oscillations in the EEJ. We calculated the ratio between GW-related electric fields and the total Ez, which is an indicator of the efficiency in the production of an additional electric field due to a gravity wave neutral wind. In the present paper we describe the methodology of analysis and discuss some characteristics of the gravity waves that could modify the equatorial ionospheric electric fields.