Local time dependence of ionospheric equinoctial asymmetry
文献类型：期刊论文
| 作者 | Liu Yong1,2,3; Chen Yi-Ding1,2,3; Liu Li-Bo1,2 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2016-11-01 |
| 卷号 | 59期号:11页码:3941-3954 |
| 关键词 | f(o)F(2) f(o)E GPS TEC Ionosphere Equinoctial asymmetry |
| DOI | 10.6038/cjg20161101 |
| 文献子类 | Article |
| 英文摘要 | In this paper, the critical frequency of the F-2-layer (f(o)F(2)) and the critical frequency over the E-layer (f(o)E) of global 203 ionosonde stations and Jet Propulsion Laboratory (JPL) total electron content (TEC) map data were used to investigate the characteristics of ionospheric equinoctial (March Equinox and September Equinox, ME and SE) asymmetry. By fitting the three parameters f(o)F(2) , f(o)E and TEC in terms of a function of Day of Year (DoY) and the solar activity index F-10.7 the three parameters were normalized to the low solar activity level of F-10.7 = 80, the moderate solar activity level of F-10.7 = 150, and the high solar activity level of F-10.7 = 200. Thus, by this method, the actually observed seasonal and solar activity variations of ionospheric parameters, which are interlaced with each other, can be quantitatively separated to acquire more accurate characteristics of ionospheric equinoctial asymmetry. The equinoctial asymmetry index (AI) and the equinoctial difference (Delta=ME-SE) of the three ionospheric parameters at different local times were analyzed to get the global features and the solar activity dependence of equinoctial asymmetry. In general, f(o)E is mainly higher at SE than at ME over the global ionosonde stations at sunrise, and the equinoctial asymmetry of f(o)E almost disappears in the afternoon, while f(o)E is higher at ME than at SE at sunset. f(o)F(2) is higher at SE than at ME over the most of the global ionosonde stations at sunrise, while it is higher at ME than at SE at other local times. With respect to TEC, the equinoctial asymmetry of higher TEC at SE than at ME exists over the global at low solar activity level but mainly occurs at low latitudes at moderate and high solar activity levels at sunrise, while TEC is mainly higher at ME than at SE at other local times. The dependence of the equinoctial asymmetry of f(o)E is weak, while for f(o)F(2) and TEC, solar activity dependence of the equinoctial asymmetry is evident. The equinoctial asymmetries of the oxygen nitrogen ratio ([O]/[N2], computed from the atmospheric model NRLMSISE-00) at the peak height of the F-2-layer (h(m)F(2)) and h(m)F(2) were investigated; they can be used to partially explain the equinoctial asymmetry of f(o)F(2). The amplitude and the phase of TEC annual variation were calculated. The phase of TEC annual variation can be used to account for the global distribution of TEC equinoctial asymmetry. |
| WOS关键词 | PEAK ELECTRON-DENSITY ; SEASONAL-VARIATIONS ; SOLAR-ACTIVITY ; F-REGION ; SEMIANNUAL VARIATIONS ; MU RADAR ; THERMOSPHERIC WINDS ; LATITUDE ; CYCLE ; NMF2 |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000387300200001 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/53267]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Yong,Chen Yi-Ding,Liu Li-Bo. Local time dependence of ionospheric equinoctial asymmetry[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(11):3941-3954. |
| APA | Liu Yong,Chen Yi-Ding,&Liu Li-Bo.(2016).Local time dependence of ionospheric equinoctial asymmetry.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(11),3941-3954. |
| MLA | Liu Yong,et al."Local time dependence of ionospheric equinoctial asymmetry".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.11(2016):3941-3954. |
入库方式： OAI收割
来源：地质与地球物理研究所
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