An investigation into the horizontal structure of spread-E(s)

Details An investigation into the horizontal structure of spread-E(s) An investigation into the horizontal structure of spread-E(s)

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..391b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Mar.-Apr. 1992, p. 391-399.

Physics

5

Cloud Cover, E Region, Radar Echoes, Traveling Ionospheric Disturbances, Angular Resolution, Doppler Effect, Ionograms, Ionospheric Drift

Scientific paper

Observations by From and Whitehead (1986) indicated that spread-E(s) consisted of many small clouds covering a large angular range and all traveling 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. An investigation shows that model data generated from long-lasting echoes with reflection points spaced closer than 3 km intervals, and traveling with the same velocity, produce similar results to experimental spread-E(s) data. An example is also presented showing the structure of spread-E(s) moving with a similar velocity to the overall drift of the E(s) layer. A better model for spread E(s) 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 nonfield-aligned irregularities produced by the gradient instability, but unlikely for irregularities caused by atmospheric waves. The conclusions of Jones (1984) concerning short-lived reflectors in the E-region must also be open to question by these results.

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