Latitudinal variation of the specific local time of postmidnight enhancement peaks in F layer electron density at low latitudes: A case study

Latitudinal variation of the specific local time of postmidnight enhancement peaks in F layer electron density at low latitudes: A case study
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低纬度F层电子密度午夜后增强峰特定局部时间的纬度变化:以实例研究

DOI:
10.1002/2015ja022319
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发表时间:
2016-04
影响因子:
2.8
通讯作者:
Yatini Clara Y.
Yatini Clara Y.
中科院分区:
地球科学2区
文献类型:
--
作者:
Jiang Chunhua;Deng Chi;Yang Guobin;Liu Jing;Zhu Peng;Yokoyama Tatsuhiro;Song Huan;Lan Ting;Zhou Chen;Wu Xiongbin;Zhang Yuannong;Zhao Zhengyu;Komolmis Tharadol;Supnithi Pornchai;Yatini Clara Y.

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电离层夜间增强表现在夜间电子密度的增加。本文利用分布在低纬的电离层探测仪研究了午夜后增强峰的比地方时的纬向变化。为了获得电离层的参数,我们手动提取电离层探测仪记录的电离图。实例表明,观测到的午夜后增强峰的当地时间存在明显的纬度变化。结果表明,地磁纬度越低,增强峰出现在地磁北方半球越早。此外,在这些情况下,增强峰值出现在地磁南半球早于地磁北方半球。我们认为,地磁倾角和经赤道纬向风的共同作用可能是导致地震发生时纬向变化的主要驱动力。
Ionospheric nighttime enhancements are manifested in an increase of the electron density at nighttime. This paper studies the latitudinal variation of the specific local time of postmidnight enhancement peaks using ionosondes distributed at low latitudes. To obtain the parameters of the ionosphere, we manually extracted ionograms recorded by ionosondes. Cases show that there are significant latitudinal variations in the observed local time of the postmidnight enhancement peaks. Results show that the lower the geomagnetic latitude, the earlier the enhancement peak occurred in the geomagnetic northern hemisphere. Additionally, the enhancement peaks occurred earlier in the geomagnetic southern hemisphere than that in the geomagnetic northern hemisphere for these present cases. We suggest that the combined effect of the geomagnetic inclination and transequatorial meridional wind might be the main driving force for latitudinal variation of the local time of the occurrence.
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发表时间: 2007-01
影响因子: 5.2
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