The dawn enhancement of the equatorial ionospheric vertical plasma drift

The dawn enhancement of the equatorial ionospheric vertical plasma drift
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赤道电离层垂直等离子体漂移的黎明增强

DOI:
10.1002/2015ja021972
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发表时间:
2015-12
期刊:
J. Geophys. Res. Space Physics
影响因子:
--
通讯作者:
Le Huijun
Le Huijun
中科院分区:
其他
文献类型:
--
作者:
Zhang Ruilong;Liu Libo;Chen Yiding;Le Huijun

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先前的研究报告称,黎明增强现象在赤道电离层垂直等离子体漂移的统计图中并不存在,而在实际测量中却清晰地显示出来。在这项统计研究中,首次利用rosat - 1在地磁平静时期的观测资料,研究了赤道电离层垂直等离子体漂移中黎明增强现象的发生。黎明增强在6月至日最常见,在12月至日最不常见。统计调查表明,这种现象的发生与磁偏角有关。在320°经度附近区域增强幅度最大,在6月至日达到峰值。共轭E区黎明增强在日出后达到峰值。此外,还发现黎明增强与共轭E区日出时间差(日出时差)密切相关。日出时间滞后较大的地区容易出现黎明增强现象。
Previous studies have reported that a dawn enhancement does not present in the statistical picture of the equatorial ionospheric vertical plasma drift, while it clearly shows in case measurements. In this statistical study, it is the first time to investigate the occurrence of the dawn enhancement in the equatorial ionospheric vertical plasma drift from ROCSAT‐1 observations during geomagnetic quiet times. The dawn enhancements occur most frequently in June solstice and least frequently in December solstice. The statistical survey shows that the occurrence depends on the magnetic declination. The enhancement has the strongest amplitude in regions near 320° longitude and peaks during June solstice. The dawn enhancement reaches its peak after the sunrise in conjugated E regions. Furthermore, it is found that the dawn enhancement is closely related to the difference between the sunrise times in the conjugated E regions (sunrise time lag). The dawn enhancement occurs easily in regions with a large sunrise time lag.
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发表时间: 1986-03
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