Citation: | YANG Ding, FANG Hanxian, YANG Shenggao, WANG Sicheng. Statistical Study on the Response of TEC to Geomagnetic Stormsormalsize[J]. Chinese Journal of Space Science, 2017, 37(5): 524-530. doi: 10.11728/cjss2017.05.524 |
The ionospheric Total Electron Content (TEC) in the daytime is often greatly disturbed during geomagnetic storms. Recent reports suggest that the disturbance of TEC depends on the Universal Time (UT) of storm onset. By using the TEC global maps over a 7-year period produced by the Jet Propulsion Laboratory, the response of TEC to geomagnetic storms is investigated. The analysis confirms that TEC increases obviously in day time, and extends across the noon sector with an afternoon peak. In 18:00UT-04:00 UT, American sector continues to exhibit a storm time, which TEC enhancement is higher than those observed in the other sector. It is possibly related to the sunlight in day time. In order to study the relation between TEC enhancement and the corresponding magnetic storms, the TEC data are divided into quiet (Dst>-50nT) and active (Dst<-100nT) sets using Dst index. The results show that the TEC variation at low latitudes has negative relation to Dst as the TEC variation is moved forward about 2 hours. The relation coefficient is -0.75. The TEC variation at middle latitudes has negative relation to Dst with a coefficient of -0.61, as it is moved forward about 1 hour. The reason may be that the travelling atmosphere disturbance carries the equatorial meridional wind, and propagates from polar region to low latitude. It can be concluded that the TEC variation is induced by geomagnetic storms. However, the correlation is poor at high latitudes. It is possibly because of the complexity of sectors at high latitudes.
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