DOI: 10.1029/2018JA025469
Scopus记录号: 2-s2.0-85051029220
论文题名: The Response Time of Equatorial Ionization Anomaly Crest: A Unique Precursor to the Time of Equatorial Spread F Initiation
作者: Aswathy R.P. ; Manju G. ; Sunda S.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 7 起始页码: 5949
结束页码: 5959
语种: 英语
英文关键词: equatorial ionization anomaly
; equatorial spread F
; response time
英文摘要: The time delay with which the magnitude and location of the total electron content (TEC) at the equatorial ionization anomaly (EIA) crest responds to the mean height of the F layer (hmF2) is examined seasonally using the ionosonde data at Trivandrum and the Global Positioning System data at different stations in the EIA region for low and high solar activity years. The study brings out the fact that for the low solar activity year, the crest TEC responds fastest in winter solstice compared to other seasons. Further, the response time of the crest is found to decrease with solar activity. The seasonal variation in the EIA response time is attributed to the modulation by meridional neutral winds, whereas the solar activity variation seems to be basically controlled by the diffusion times and the background ionization gradients in the respective epochs. The derived relationship between EIA crest location/magnitude and hmF2 for any season can be used for prediction purposes. Furthermore, this study for the first time establishes the relation of EIA response time to equatorial spread F (ESF) start time, for days when the F layer is in the neutral dynamically controlled domain. The deleterious effects of ESF irregularities on communication and navigation systems are well known, and the above result is significant in this context. The present study has the potential to be extended into a model to predict the ESF start time, from the EIA response time, earlier in the day. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113603
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum, India; Space Application Centre, Ahmedabad, India
Recommended Citation:
Aswathy R.P.,Manju G.,Sunda S.. The Response Time of Equatorial Ionization Anomaly Crest: A Unique Precursor to the Time of Equatorial Spread F Initiation[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(7)