Properties of large-scale TIDs observed in Central China  

作　　者：汤秋林 万卫星 宁百齐 袁洪 

机构地区：[1]Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China

出　　处：《Science China Mathematics》2002年第z1期156-160,共5页中国科学：数学（英文版）

基　　金：the National Important Basic Research Project (G2000078407) ; the National Natural Science Foundation of China (Grant No. 49974039).

摘　　要：This paper investigates the large scale travelling ionospheric disturbances (LSTIDs) using the observation data of an HF Doppler array located in Central China. The data observed in a high solar activity year (year 1989) are analyzed to obtain the main propagation parameters of LSTIDs such as period, horizontal phase velocity and propagating direction. Results are outlined as follows: Most of the LSTIDs propagate southward; others tend to propagate northward, mostly in summer; dispersion of most LSTIDs is matched with that of Lamb pseudomode, while others have the dispersion of long period gravity wave mode. The horizontal phase velocities of these two modes are about 220 and 450 m/s respectively. The analysis shows that LSTIDs are strongly pertinent to solar activity and space magnetic storms; thus the results presented here are significant for the research of ionospheric weather in mid-low latitude region.This paper investigates the large scale travelling ionospheric disturbances (LSTIDs) using the observation data of an HF Doppler array located in Central China. The data observed in a high solar activity year (year 1989) are analyzed to obtain the main propagation parameters of LSTIDs such as period, horizontal phase velocity and propagating direction. Results are outlined as follows: Most of the LSTIDs propagate southward; others tend to propagate northward, mostly in summer; dispersion of most LSTIDs is matched with that of Lamb pseudomode, while others have the dispersion of long period gravity wave mode. The horizontal phase velocities of these two modes are about 220 and 450 m/s respectively. The analysis shows that LSTIDs are strongly per- tinent to solar activity and space magnetic storms; thus the results presented here are significant for the research of ionospheric weather in mid-low latitude region.

关 键 词：It mid-low LATITUDE ionosphere  LSTIDs  SPACE weather. 

分 类 号：P182[天文地球—天文学]