Volume 37 Issue 6
Nov.  2017
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SHANG Sheping, SHI Jiankui, YAN Jingye, YANG Guotao, YAN Chunxiao, WANG Xiao, WU Qiongzhi. Analysis of Low Latitude F Region Field-aligned Irregularity Events Observed with Hainan VHF Radar[J]. Journal of Space Science, 2017, 37(6): 702-709. doi: 10.11728/cjss2017.06.702
Citation: SHANG Sheping, SHI Jiankui, YAN Jingye, YANG Guotao, YAN Chunxiao, WANG Xiao, WU Qiongzhi. Analysis of Low Latitude F Region Field-aligned Irregularity Events Observed with Hainan VHF Radar[J]. Journal of Space Science, 2017, 37(6): 702-709. doi: 10.11728/cjss2017.06.702

Analysis of Low Latitude F Region Field-aligned Irregularity Events Observed with Hainan VHF Radar

doi: 10.11728/cjss2017.06.702
  • Received Date: 2017-01-11
  • Rev Recd Date: 2017-05-10
  • Publish Date: 2017-11-15
  • Hainan VHF radar has the rapid scan observation capability of two-dimensional imaging of ionospheric irregularities, which is essential for investigating the generation and evolution of Field-Aligned Irregularities (FAI). In this study, the ionospheric irregularities observed by Hainan VHF radar on the night of Oct. 27, 2011 have been analyzed. The main results show that the observed irregularities can be divided into three stages. In the initial formation stage, the irregularities appear very weak and develop very slowly, which mainly expand upward and last for about 14 minutes. In the expansion and enhancement stage, the irregularities rapidly expand and develop both in upward and zonal directions, which last for about 14 minutes. The intensity of irregularities early increases rapidly and later slightly decreases. The spatial scale of irregularities exceeds more than 200km. In the stage of eastward drift and leaving, the intensity of irregularities further decreases, and the expansion area reaches the maximum. It mainly shows the eastward drift and last for nearly 30 minutes. This observation firstly gives the formation and development processes of ionospheric irregularities over the Hainan region, which seems to be quite different from that of other regions.

     

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