The Variation Characteristics of the Spread-F Occurrences at Chongqing in China
In the post-sunset ionosphere,plasma depleted bubbles with associated irregularity structures of scale sizes varying from centimeters to kilometers are generated due to plasma instability processes which causes the ionospheric irregularities.Ionospheric spread-F was discovered some decades ago.The variation in spread-F occurrence percentages continues to be an active area for scientific investigations at the present time.The spread-F presents a large dependence on the solar flux,the local time,the season,the latitude and longitude and the magnetic disturbances.In this paper,we present simultaneous ionosonde observations carried out at Chongqing(29.51°N, 106.42°E),which is located at the middle latitude in China,to study the characteristics of spread-F occurrence percentages and variations with local time,season and solar activity during 1997 to 2016.The results show that the onset time of spread-F seems to start at around 20 LT and continue till 05 LT at middle latitude.The spread-F occurs during summer most frequently at Chongqing.The spread-F occurrences decrease with the increase of solar and geomagnetic activity at middle latitude.These observations may improve our understanding of the factors responsible for the generation,growth and dynamics of the middle latitude spread-F events.
Ionospheric irregularities spread-F occurrences variation characteristics at middle latitude
Wang Ning Guo Li-xin Ding Zong-hua Zhao Zhen-wei Xu Zhengwen Xu Tong
School of Physics and Optoelectronic Engineering Xidian University Xian,China;State Key Laboratory School of Physics and Optoelectronic Engineering Xidian University Xian,China State Key Laboratory of Space Weather,Chinese Academy of Sciences;National Key Laboratory of Electro National Key Laboratory of Electromagnetic Environment China Research Institute of Radio-wave Propag
国际会议
杭州
英文
1-4
2018-12-03（万方平台首次上网日期，不代表论文的发表时间）