Investigation of Irregularities Induced from Medium-scale Traveling Ionospheric Disturbances Using Global Positioning System and Digisonde
This study is intended to investigate the irregularities induced from medium-scale traveling ionospheric disturbances(MSTIDs)over Wuhan(30.51°N,114.41°E)in China.We employed the data came from the GPS receiver and the digisonde at Wuhan.The data were limited in 2000 when sun was in high solar activity period.The events of MSTIDs were derived from the perturbations of total electron content(TEC)of GPS data.The GPS phase fluctuation index and the spread F occurrences were calculated and examined from the GPS and digisonde observations,respectively.We explored the seasonal and nighttime occurrence rates as well as the one-to-one correspondences for these phenomena.We discovered that,for the seasonal variations,three phenomena all are highly active in summer,which confirms that irregularities over Wuhan mainly relate to MSTIDs.Moreover,all spread F types have a minor occurrence peak in winter but none for the MSTIDs and the GPS phase fluctuations.Besides,none of large GPS phase fluctuations event had occurred during observation periods,which indicates that the strength of irregularities related to MSTIDs are weaker than that of equatorial plasma bubbles.For the nighttime variations,the frequency spread F occurs earlier than other spread F types which implies that disturbances start at the altitude near the F-region peak.For the one-to-one correspondences,the occurrence rates of each spread F type and GPS phase fluctuations are low during MSTIDs occurred.This implies that smaller scale irregularities which are observed as spread F or GPS phase fluctuations may only appear in some phase of MSTIDs.
Wei-Sheng Chen Chien-Chih Lee Fang-Dar Chu
General Education Center,Chien Hsin University of Science and Technology,Taiwan National Standard Time and Frequency Lab,Chunghwa Telecom Co.Ltd.,Taiwan
国际会议
Progress in Electromagnetics Research Symposium 2013(2013年电磁学研究新进展学术研讨会)
台北
英文
604-607
2013-03-01（万方平台首次上网日期，不代表论文的发表时间）