Recent work on mid-latitude and equatorial sporadic-E

Whitehead J.D. (1989) Recent work on mid-latitude and equatorial sporadic-E. Journal of Atmospheric and Terrestrial Physics, 51 5: 401-424. doi:10.1016/0021-9169(89)90122-0


Author Whitehead J.D.
Title Recent work on mid-latitude and equatorial sporadic-E
Journal name Journal of Atmospheric and Terrestrial Physics
ISSN 0021-9169
Publication date 1989
Sub-type Article (original research)
DOI 10.1016/0021-9169(89)90122-0
Volume 51
Issue 5
Start page 401
End page 424
Total pages 24
Subject 1902 Film, Television and Digital Media
1908 Geophysics
Abstract Theoretical and experimental work since 1970 is summarized. Mid-latitude sporadic-E is most likely due to a vertical shear in the horizontal east-west wind and this theory accounts for the detailed observations of the wind and electron density profiles. Preferred heights of sporadic-E are separated by about 6km and descending layers are often seen moving down with velocities in the range 0.6-4 ms-. Sometimes sporadic-E layers are very flat and uniform, and at other times form clouds of electrons 2-100km in size moving horizontally at 20-130 ms-1. Sporadic-E is probably not correlated with meteor showers; this is a rather surprising result since the ions are meteor debris. The major problems with windshear theory are to account for the dramatic seasonal variation and, to a lesser extent, for the geographical and diurnal distributions. The Q-type equatorial sporadic-E appears to be due to the gradient instability. There is a very much smaller amount of new experimental data available in this area.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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