An investigation into the horizontal structure of spread-Es

Barnes R.I. (1992) An investigation into the horizontal structure of spread-Es. Journal of Atmospheric and Terrestrial Physics, 54 3-4: 391-399. doi:10.1016/0021-9169(92)90018-G

Author Barnes R.I.
Title An investigation into the horizontal structure of spread-Es
Journal name Journal of Atmospheric and Terrestrial Physics
ISSN 0021-9169
Publication date 1992-01-01
Sub-type Article (original research)
DOI 10.1016/0021-9169(92)90018-G
Volume 54
Issue 3-4
Start page 391
End page 399
Total pages 9
Subject 1902 Film, Television and Digital Media
1908 Geophysics
Abstract Observations by From and Whitehead [(1986), Radio Sci. 21, 309] indicated that spread-Es consisted of many small clouds covering a large angular range and all travelling with similar velocity, but each reflector only lasting for 2-3 s. Model data used with a similar analysis to that used by From and Whitehead have shown that the clouds may well be long lasting. The noisy, short-lived appearance of the echoes is an artefact of the analysis procedure. These spurious results only occur when many echoes, extending over an angular range much larger than the beamwidth, are situated closer to each other than the angular resolution of the radar. An investigation shows that model data generated from long-lasting echoes with reflection points spaced closer than 3 km intervals, and travelling with the same velocity, produce similar results to experimental spread-Es data. An example is also presented showing the structure of spread-Es moving with a similar velocity to the overall drift of the spread-Es layer. A better model for spread-Es then becomes one where a larger cloud, produced by the windshear mechanism, subsequently has many small irregularities of the order 1 km in extent produced within it by some other disturbance. The irregularities move with the same velocity as the larger cloud, which is consistent with non-field-aligned irregularities produced by the gradient instability, but unlikely for irregularities caused by atmospheric waves. The conclusions of Jones [(1984). J. atmos. terr. Phys. 46, 1179] concerning short-lived reflectors in theE-region must also be open to question by these results.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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