Ionospheric response to the geomagnetic storm on 13-17 April 2006 in the West Pacific region
Ionospheric response to the geomagnetic storm on 13-17 April 2006 in the West Pacific region
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DOI：
10.1016/j.jastp.2008.09.029
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发表时间：
2009
影响因子：
1.9
通讯作者：
B. Zhao;W. Wan;Libo Liu;K. Igarashi;K. Yumoto;B. Ning
中科院分区：
文献类型：
--
作者：
B. Zhao;W. Wan;Libo Liu;K. Igarashi;K. Yumoto;B. Ning
研究了2006年4月13-17日强磁暴期间西太平洋赤道和中低纬F区的磁暴效应。研究了2006年4月13-17日强磁暴期间西太平洋赤道和中低纬F区的磁暴效应。这场风暴于4月13日21时30分开始，当时行星际磁场（IMF）Bz分量正准备转向南方。14-17日，沿东经120°沿着的14个台站和GPS网的同步电离层探测结果表明，电离层的特征是临界频率foF 2（4 × 6 MHz）和总电子含量（TEC）（1 TECU =1× 1016 el/m2）大幅度增强，随后出现一个长时间的负相。在磁暴的初始阶段，在早晨部分观察到一个周期性的波结构，称为电离层扰动（TID），这应该与脉冲磁层能量注入极光有关。在下午和夜间，正相位应该是由向赤道的风和扰动电场的组合引起的，通过赤道F层峰值高度变化和费耶尔和Scherliess [1997.风暴时间赤道电场的经验模式。地球物理研究杂志102，24，047 - 24，056]。结果表明，4月15日上午-中午时段，南半球的大正风暴效应更加明显，负相到达了北方半球的低磁纬度地区，这可能与风暴期间热层条件的不对称性有关。
This paper presents an investigation of geomagnetic storm effects in the equatorial and middle-low latitude F-region in the West Pacific sector during the intense geomagnetic storm on 13–17 April, 2006. This paper presents an investigation of geomagnetic storm effects in the equatorial and middle-low latitude F-region in the West Pacific sector during the intense geomagnetic storm on 13–17 April, 2006. The event, preceded by a minor storm, started at 2130 UT on April 13 while interplanetary magnetic field (IMF) Bzcomponent was ready to turn southward. From 14–17 the ionosphere was characterized by a large scale enhancement in critical frequency, foF2 (4∼6MHz) and total electron content (TEC) (∼30TECU, 1TECU=1×1016el/m2) followed by a long-duration negative phase observed through the simultaneous ionospheric sounding measurements from 14 stations and GPS network along the meridian 120°E. A periodic wave structure, known as traveling ionospheric disturbances (TIDs) was observed in the morning sector during the initial phase of the storm which should be associated with the impulsive magnetospheric energy injection to the auroral. In the afternoon and nighttime, the positive phase should be caused by the combination of equatorward winds and disturbed electric fields verified through the equatorial F-layer peak height variation and modeled upward drift of Fejer and Scherliess [1997. Empirical models of storm time equatorial electric fields. Journal of Geophysical Research 102, 24,047–24,056]. It is shown that the large positive storm effect was more pronounced in the Southern Hemisphere during the morning-noon sector on April 15 and negative phase reached to lower magnetic latitudes in the Northern Hemisphere which may be related to the asymmetry of the thermospheric condition during the storm.