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Seasonal and latitudinal differences of the saturation effect between ionospheric NmF2 and solar activity indices
Ma, R. P.; Xu, J. Y.; Wang, W. B.; Yuan, W.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationJournal of Geophysical Research-Space Physics
2009
Volume114Pages:A10303
ISSN0148-0227
Language英语
KeywordInternational Reference Ionosphere Peak Electron-density Cycle Variations Global-model Radio Noise F-region Euv Fof2 Winds Atmosphere
AbstractThe seasonal and latitudinal differences of the correlations between daytime ionospheric F-2 peak electron density (NmF2) and solar activity indices in the east Asian/Australian sector have been analyzed using data from 15 ionosonde stations at different geomagnetic latitudes during 1969 similar to 1990. It is found that the characteristics of the correlations between NmF2 and solar activity indices have significant seasonal and latitudinal variations and hemispheric asymmetry. At middle and high latitudes, there is a clear saturation trend in NmF2 as solar activity increases in summer. However, there is no apparent saturation trend in winter, rather a tendency of nonlinear increase of NmF2 with solar activity. This nonlinear increasing effect is more pronounced in the Northern Hemisphere. In the equatorial anomaly region, the saturation effect is stronger, and the equinox has the strongest saturation effect. All seasons considered, the equatorial anomaly region has the strongest saturation effect, followed by the magnetic equatorial region. The saturation effect becomes relatively weak at middle latitudes. At higher latitudes and in the Northern Hemisphere, there is even a trend of nonlinear increase of NmF2 with solar activity. Our results indicate that thermospheric global circulation is probably an important factor that introduces seasonal, latitudinal, and north-south differences in the correlations between NmF2 and solar activity indices.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1135
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Ma, R. P.,Xu, J. Y.,Wang, W. B.,et al. Seasonal and latitudinal differences of the saturation effect between ionospheric NmF2 and solar activity indices[J]. Journal of Geophysical Research-Space Physics,2009,114:A10303.
APA Ma, R. P.,Xu, J. Y.,Wang, W. B.,Yuan, W.,&北京8701信箱.(2009).Seasonal and latitudinal differences of the saturation effect between ionospheric NmF2 and solar activity indices.Journal of Geophysical Research-Space Physics,114,A10303.
MLA Ma, R. P.,et al."Seasonal and latitudinal differences of the saturation effect between ionospheric NmF2 and solar activity indices".Journal of Geophysical Research-Space Physics 114(2009):A10303.
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