| Observational study of daytime ionospheric irregularities associated with typhoon | |
| Xiao SaiGuan; Shi JianKui; Zhang DongHe; Hao YongQiang; Huang WeiQuan; Xiao, SG (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China. | |
| Department | 空间科学部 |
| Source Publication | SCIENCE CHINA-TECHNOLOGICAL SCIENCES
 |
| 2012 | |
| Volume | 55Issue:5Pages:1302-1304 |
| ISSN | 1674-7321 |
| Language | 英语 |
| Keyword | Ionospheric Irregularity Spread-f Daytime Typhoon |
| Abstract | Spread-F is a manifestation of ionospheric irregularities and generally takes place at nighttime. However, it can also be observed seldom at daytime. It is recognized that acoustic gravity waves (AGWs) play an important role in triggering plasma instability which results in spread-F in the ionosphere. The typhoon is a main source of the AGWs. In this paper, two cases of ionospheric daytime spread-F in the period of typhoon were analyzed. One case was on July 29, 1988 and the other was on August 01, 1989. The results showed the following: I) There were some wave-like disturbances appearing in the HF Doppler records firstly, consequently the Doppler echo traces became scattered, which indicated that the ionospheric spread-F was triggered; 2) the blurred echo traces in the both two cases appeared in the morning (08:30-11:30 Beijing time) and lasted for more than two hours; 3) with the blurred echoes gradually weakening, the traveling ionospheric disturbances (TIDs) still existed and became clearer; 4) the frequency shifts in the two cases were both positive, implying the effective reflecting surface of the radio wave in the ionosphere moved downwards. These results provide good observational evidence for daytime spread-F during the typhoon period in Asian region.; Spread-F is a manifestation of ionospheric irregularities and generally takes place at nighttime. However, it can also be observed seldom at daytime. It is recognized that acoustic gravity waves (AGWs) play an important role in triggering plasma instability which results in spread-F in the ionosphere. The typhoon is a main source of the AGWs. In this paper, two cases of ionospheric daytime spread-F in the period of typhoon were analyzed. One case was on July 29, 1988 and the other was on August 01, 1989. The results showed the following: I) There were some wave-like disturbances appearing in the HF Doppler records firstly, consequently the Doppler echo traces became scattered, which indicated that the ionospheric spread-F was triggered; 2) the blurred echo traces in the both two cases appeared in the morning (08:30-11:30 Beijing time) and lasted for more than two hours; 3) with the blurred echoes gradually weakening, the traveling ionospheric disturbances (TIDs) still existed and became clearer; 4) the frequency shifts in the two cases were both positive, implying the effective reflecting surface of the radio wave in the ionosphere moved downwards. These results provide good observational evidence for daytime spread-F during the typhoon period in Asian region. |
| Indexed By | SCI ; EI |
| Funding Project | 中国科学院空间科学与应用研究中心 |
| Document Type | 期刊论文 |
| Identifier | http://ir.nssc.ac.cn/handle/122/3121 |
| Collection | 空间科学部 |
| Corresponding Author | Xiao, SG (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Xiao SaiGuan,Shi JianKui,Zhang DongHe,et al. Observational study of daytime ionospheric irregularities associated with typhoon[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2012,55(5):1302-1304. |
| APA | Xiao SaiGuan,Shi JianKui,Zhang DongHe,Hao YongQiang,Huang WeiQuan,&Xiao, SG .(2012).Observational study of daytime ionospheric irregularities associated with typhoon.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,55(5),1302-1304. |
| MLA | Xiao SaiGuan,et al."Observational study of daytime ionospheric irregularities associated with typhoon".SCIENCE CHINA-TECHNOLOGICAL SCIENCES 55.5(2012):1302-1304. |
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