Volume 34 Issue 1
Jan.  2014
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Article Navigation >  Chinese Journal of Space Science  > 2014  >  34(1): 53-62
Shang Sheping, Shi Jiankui, Yan Jingye, Yang Guotao, Wang Xiao, Yan Chunxiao, Wang Jihong, Wu Qiongzhi, Nan Fang. Investigations of low latitude E region field-aligned irregularities with Hainan VHF radar[J]. Chinese Journal of Space Science, 2014, 34(1): 53-62. doi: 10.11728/cjss2014.01.053
Citation: Shang Sheping, Shi Jiankui, Yan Jingye, Yang Guotao, Wang Xiao, Yan Chunxiao, Wang Jihong, Wu Qiongzhi, Nan Fang. Investigations of low latitude E region field-aligned irregularities with Hainan VHF radar[J]. Chinese Journal of Space Science, 2014, 34(1): 53-62. doi: 10.11728/cjss2014.01.053
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Investigations of low latitude E region field-aligned irregularities with Hainan VHF radar

doi: 10.11728/cjss2014.01.053
  • 1.

    State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190

  • 2.

    Key Laboratory of Microwave Remote Sensing, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190

  • 3.

    School of Information and Electronics, Beijing Institute of Technology, Beijing 100081

  • Received Date: 2013-02-01
  • Rev Recd Date: 2013-07-21
  • Publish Date: 2014-01-15
    Abstract
  • Using the continuous observation data of Hainan VHF radar (19.5°N, 109.1°E; dip latitude 8.1°N) on July 15—22, 2011, the characteristics of 3m scale Field-Aligned ionospheric Irregularities (FAI) in Eastern Asia low latitude are analyzed. The main results show the E region FAI echoes almost occur everyday during the whole observation period. They can occur both in day and night and have different complicated structures. According to their occurrence time and structure, the E region FAI echoes can be classified into the following three cases. First is the lower continuous echoes, which mainly occur from the later afternoon to pre-midnight (17:30LT—23:00LT) with evident enhanced echo intensity and negative (downward/southward) Doppler velocities. The second is the upper descend layer structures, which mainly appear from nearly midnight to pre-sunrise (23:00LT°05:00LT) with more enhanced echo intensity and both positive and negative Doppler velocities, where the positive Doppler velocities (upward/northward) dominate in the upper E region echoes. The third is the daytime continuous echoes, which mainly occur from morning to nearly noontime (07:00LT—11:30LT) with reduced echo intensity and both positive and negative Doppler velocities. These low latitude E region echoes mainly are type-I!I, which is similar to that of the Equatorial Electrojet (EEJ) and mid-latitude regions, but their temporal behavior is evidently different from that of the latter two latitudes and also has some differences with that of the other low latitudes.

     

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