期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
卷 118, 期 7, 页码 4640-4648出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/jgra.50422
关键词
ionosphere; low latitude; nighttime enhancement; electron density; electric field; post-midnighttime enhancement
资金
- Chinese Academy of Sciences [KZZD-EW-01-3]
- National Key Basic Research Program of China [2012CB825604]
- National Natural Science Foundation of China [41231065, 41174137, 41074112]
The electron density in the ionospheric F region occasionally stops its decay and rises pronouncedly during night hours, which are termed ionospheric nighttime enhancements. In this case study, we analyzed the manually scaled ionogram records measured by a Lowell DPS-4D ionosonde operated at Sanya (18.3 degrees N, 109.6 degrees E), China, to explore postmidnight enhancement events occurred in 2012, a year of moderate solar activities. Common features in these cases illustrate that, accompanying nighttime rises in peak electron density of F2 layer (NmF2), the height of F2 layer is depressed significantly, and the ionogram-derived electron density height profiles become thinner. There are time shifts in the development of electron density enhancements in the F layer; that is, enhancement develops earlier and reaches peaks earlier at higher altitudes than at lower altitudes. Meanwhile, plasma drift is detected downward under such events, revealing the essential role of the westward electric field in forming the postmidnight enhancements in electron density of ionospheric F layer at such low latitudes.
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