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Chinese Journal of Space Science ›› 2017, Vol. 37 ›› Issue (5): 524-530.doi: 10.11728/cjss2017.05.524

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Statistical Study on the Response of TEC to Geomagnetic Stormsormalsize

YANG Ding1,2, FANG Hanxian2, YANG Shenggao2, WANG Sicheng2   

  1. 1. Meteorological Observatory, No. 93279 Air Force, Dandong 118000;
    2. Institute of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101
  • Received:2016-10-21 Revised:2017-05-08 Online:2017-09-15 Published:2017-09-06

Abstract:

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.

Key words: Geomagnetic storms, TEC disturbance, Dst index, Correlation

CLC Number: