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Chinese Journal of Space Science ›› 2014, Vol. 34 ›› Issue (1): 29-37.doi: 10.11728/cjss2014.01.029

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Ionosphere response to recurrent geomagnetic activity during 2008 and 2009

Liu Xiaoju1,2, Chen Yanhong1, Gong Jiancun1   

  1. 1. Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190;
    2. University of Chinese Academy of Sciences, Beijing 100049
  • Received:2013-03-01 Revised:2013-10-20 Online:2014-01-15 Published:2013-12-26

Abstract:

GPS TEC data are used to analyze ionospheric response to recurrent geomagnetic activity in 2008 and 2009. Periodic analysis indicates that the significant periodicities of 9 and 13.5 days exist in in global mean Total Electron Content (TEC), ap index and solar wind speed but not in solar F10.7 index. This shows that the short period variations in TEC are mainly related to recurrent geomagnetic activity caused by solar high-speed stream. The local time and latitudinal analysis indicates that the positive and negative perturbations always occur at high-latitude of northern and southern hemisphere at nighttime. At middle to low latitudes, there is mainly positive perturbation at night. The amplitude of the nighttime disturbance in high latitude is larger than middle to low latitudes at night. The daytime TEC response at middle to low latitude is generally in-phase with ap's perturbation. There is a time delay between TEC disturbance and ap variations at high-latitude of southern hemisphere. The amplitude of 9-day, 13.5-day periodicities in 2008 are larger than those in 2009.

Key words: Ionosphere, Recurrent geomagnetic activity, Periodicity

CLC Number: