Coordinated observations of F region 3m field-aligned plasma irregularities associated with medium-scale traveling ionospheric disturbances

CCUR > College of Natural Science and Engineering > College of Science > Department of Physics > journal articles > Item 987654321/35925

Please use this identifier to cite or link to this item: https://irlib.pccu.edu.tw/handle/987654321/35925

Title:	Coordinated observations of F region 3m field-aligned plasma irregularities associated with medium-scale traveling ionospheric disturbances
Authors:	Lin, FF (Lin, F. F.) Wang, CY (Wang, C. Y.) Su, CL (Su, C. L.) Shiokawa, K (Shiokawa, K.) Saito, S (Saito, S.) Chu, YH (Chu, Y. H.)
Contributors:	物理系
Keywords:	Eastward drifting MSTID was observed at low latitude during nighttime Three meter FAIs occurred at west boundary of depletion region of MSTID Gradient drift instability is believed to be responsible for the generation of 3m FAIs
Date:	2016-04
Issue Date:	2017-04-14 13:29:47 (UTC+8)
Abstract:	Three meter field-aligned irregularities (3m FAIs) associated with medium-scale traveling ionospheric disturbances (MSTIDs) that occurred on 5 February 2008 were observed by using the Chung-Li 52MHz coherent scatter radar. Interferometry measurements show that the plasma structures responsible for the 3m FAI echoes are in a clumpy shape with a horizontal dimension of about 10-78km in a height range of 220-300km. In order to investigate the dynamic behaviors of the plasma irregularities at different scales in the bottomside of F region, the VHF radar echo structures from the 3m FAIs combined with the 630 nm airglow images provided by the Yonaguni all-sky imager are compared and analyzed. The results show that the radar echoes were located at the west edge of the depletion zones of the 630 nm airglow image of the MSTIDs. The bulk echo structures of the 3m FAIs drifted eastward at a mean trace velocity of about 30m/s that is in general agreement with the zonal trace velocity of the MSTIDs shown in the 630nm airglow images. These results suggest that the observed F region 3m FAIs for the present case can be regarded as the targets that are frozen in the local region of theMSTIDs. In addition, the radar-observed 3mFAI echo intensity and spectral width bear high correlations to the percentage variations of the 630nm emission intensity. These results seem to suggest that through the nonlinear turbulence cascade process, theMSTID-associated 3mFAIs are very likely generated from the kilometer-scale plasma irregularities with large amplitude excited by the gradient drift instability.
Relation:	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 卷: 121 期: 4 頁碼: 3750-3766
Appears in Collections:	[Department of Physics ] journal articles

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	292	View/Open

View Licence

Loading...