Low-latitude Es capable of controlling the onset of equatorial spread F

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題名:	Low-latitude Es capable of controlling the onset of equatorial spread F
作者:	許樂利;Joshi, L. M.;Patra, A. K.;Rao, S. V. B.
貢獻者:	全球大氣觀測與資料應用研究中心
日期:	2013-03-01
上傳時間:	2026-04-23 11:24:23 (UTC+8)
摘要:	摘要： To investigate their role on the occurrence of equatorial spread F (ESF), the low‐latitude E region in the evening hours has been characterized in terms of sporadic E ( E s ) activity based on ionosonde observations from Sriharikota, a low‐latitude station in India. While prior to the sunset, either Chapman type E layer, or E s , or a combination of the two was observed, after sunset, when observed, the E layer was exclusively E s . E s , however, could be either blanketing or nonblanketing type. Observations revealed that while the occurrence of ESF had a broad relationship with the type of E s , a detailed investigation suggested that (1) ESF occurred (did not occur) irrespective of E s type if the virtual height of the F layer base (h' F ) was greater than ~360 km (less than ~290 km), and (2) ESF occurrence depended strongly on the type of E s if 290 km < h' F < 360 km. Model computation shows that low‐latitude E s can significantly influence the growth of the Rayleigh‐Taylor instability for the cases corresponding to category 2 by increasing the total field‐line integrated Pedersen conductivity, consistent with the observations. The results presented in this paper highlight under what circumstances the low‐latitude E s would play a critical role in the occurrence of ESF, which can be used to understand the day‐to‐day variability of ESF. Low latitude E region Observations has been categorized into three categories F region response to the three categories of E region observations is presented Role of E region conductivity on RT instability has been examined 出版日期： 2013-03 出處： Journal of geophysical research : Space physics (2013 - Present), 2013-03, Vol.118 (3), p.1170-1179 資源來源： Wiley Online Library - AutoHoldings Journals 識別號： ISSN: 2169-9380 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/jgra.50189
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