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Seasonal variation of spread-F observed in Hainan
Wang, G. J.; Shi, J. K.; Wang, X.; Shang, S. P.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationAdvances in Space Research
2008
Volume41Issue:4Pages:639-644
ISSN0273-1177
Language英语
KeywordSpread-f Seasonal Variation Hainan Low Latitude Magnetic-declination Control Solar-cycle Equatorial Scintillations Region Dynamo Irregularities Depletions American Layer
AbstractUsing the spread-F (SF) data observed by DPS-4 digisonde at Hainan ionospheric observatory station from March 2002 to February 2005, occurrence features of four types of SF, i.e., frequency SF (FSF), range SF (RSF), mixed SF (MSF), and strong range SF (SSF), are studied. The results show a variation in the occurrence of the four types of the SF as a function of season, Kp and SunSpot Number (SSN). During equinoxes and summer, the occurrence frequency of all types of spread-F shows a little increase when Kp varies from 0 to 1 and then a decrease when Kp varies from 1 to 8. During winter, the occurrence frequency in days of each type of spread-F is small, however, it also shows an increase with smaller values of Kp and then shows a decrease with higher values of Kp. The RSF and SSF occurrence maximum at Hainan station are most frequent during the equinoctial months in 2002 and 2004. However, the FSF and MSF occurrence maximum are most frequent during the summer months in 2003 and 2004. The RSF and SSF occurrence rates are increasing with SSN during equinoctial and summer months. The FSF and MSF occurrence rates are decreasing with SSN during summer months. It seems that all spread-F occurrence rates are nearly independent with SSN during winter months. In this paper, we also make a comparative study on these results with the published statistics for Brazilian (Cachoeira Paulista) and Indian (Ahmedabad) sectors.
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/122/1101
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Wang, G. J.,Shi, J. K.,Wang, X.,et al. Seasonal variation of spread-F observed in Hainan[J]. Advances in Space Research,2008,41(4):639-644.
APA Wang, G. J.,Shi, J. K.,Wang, X.,Shang, S. P.,&北京8701信箱.(2008).Seasonal variation of spread-F observed in Hainan.Advances in Space Research,41(4),639-644.
MLA Wang, G. J.,et al."Seasonal variation of spread-F observed in Hainan".Advances in Space Research 41.4(2008):639-644.
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