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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Hemispheric asymmetries in the longitudinal structure of the low-latitude nighttime ionosphere
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Hemispheric asymmetries in the longitudinal structure of the low-latitude nighttime ionosphere

机译：在纵向半球不对称低纬度夜间的结构电离层

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摘要

Observations performed with the Low Resolution Airglow and Aurora Spectrograph (LORAAS), which flew aboard the Advanced Research and Global Observation Satellite (ARGOS), show evidence of wave number four longitudinal variations in the nighttime equatorial anomaly during March 2001 and March 2002. LORAAS limb scans of O I 135.6 nm emission features are used to reconstruct electron density profiles from which maps of the monthly average peak F region electron densities and heights at 0230 LT are generated. The longitudinal structure is nearly identical in both years. The locations of the longitudinal maxima in the Northern Hemisphere match that of previous studies, but the LORAAS data show a pronounced hemispheric asymmetry in the locations of the maxima in the Southern Hemisphere. The LORAAS results are compared with the International Reference Ionosphere (IRI-90) to show the derived electron densities and peak altitudes are consistent with the climatology, but that the observed longitudinal structure is not. A physics-based model of the ionosphere (Sami is Another Model of the Ionosphere (SAMI2)) is used to study the role of thermospheric neutral winds in generating the observed longitudinal pattern. It is demonstrated that longitudinally varying F region winds along with effects due to the offset of the geographic and magnetic equator are the plausible cause of the hemispheric asymmetry. Together, the effects enhance the observed wave number four pattern in the nighttime ionosphere.
机译：与低分辨率观测执行大气光和极光摄谱仪(LORAAS)飞上了高级研究和全球观测卫星(ARGOS),显示的证据四个纵向波数的变化2001年3月期间夜晚的赤道异常2002年3月。排放特性用于重建电子密度剖面的地图月平均峰值F区域电子密度和高度在0230 LT生成。纵向结构是几乎相同的两年了。最大值在北半球匹配的先前的研究,但LORAAS数据显示明显的半球不对称的位置maxima在南半球。LORAAS结果相比国际参考电离层(iri - 90)显示导出电子密度和峰海拔与气候学是一致的,但这是观察到的纵向结构不是。(萨米是另一个的电离层模型(SAMI2))是用于研究thermospheric的作用在生成观察中性风纵向模式。纵向变化F地区风由于地理的抵消和影响磁赤道的合理原因半球不对称。提高观察到的波数四个模式夜间电离层。

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