期刊
REMOTE SENSING
卷 14, 期 22, 页码 -出版社
MDPI
DOI: 10.3390/rs14225811
关键词
ionogram; Es layer; ascending layer; wind shear; electric field
类别
资金
- Project of Stable Support for Youth Team in Basic Research Field, CAS [YSBR-018]
- National Natural Science Foundation of China [42074190, 42020104002, 41727803, 41904141]
- Informatization Plan of Chinese Academy of Sciences [CAS-WX2021SF-0303, CAS-WX2021PY-0101]
By using fast ionogram observations, we have reported the first simultaneous observations of ascending ion layers at equatorial and low latitudes. These findings suggest that the local E region metallic ions could be directly brought into the F region with the ascending layer, indicating the importance of fast ionogram measurements in studying the formation of unexpected high altitude metallic layers.
By using fast ionogram observations, we report the first simultaneous observations of ascending ion layers at equatorial and low latitudes. The ionosonde measurements at Sanya (18.3 degrees N, 109.6 degrees E; dip lat. 12.2 degrees N) and Chumphon (10.7 degrees N, 99.4 degrees E; dip lat. 3.8 degrees N) show that a high Es layer, which might contain metallic ions, was directly lifted upward from the local E region to F region bottomside at morning hours, in a pattern similar to the vertical drift of the F region background ionosphere driven by the daytime eastward electric field. A statistical analysis with Sanya ionosonde measurements shows that the low latitude ascending ion layer is not a rare phenomenon, with a maximum occurrence of 22% during equinox. The results indicate that at the latitudes far away from the magnetic equator, the local E region metallic ions could be directly brought into the F region with the ascending layer. It can be expected that fast ionogram measurements, which can easily capture the rapid evolution of the background ionosphere, will play an important role in studying the formation of some unexpected high altitude metallic layers.
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