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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/27854

Title
Factors determining spectral width of HF echoes from high latitudes
Author/Creator
Ponomarenko, P. V.;  Waters, C. L.;  Menk, F. W.
Description
Spectral width is one of the standard data types produced by the Super Dual Auroral Radar Network (SuperDARN). A pronounced latitudinal gradient in spectral width has been reported in the literature and is used as an empirical proxy for the ionospheric footprint of the open-closed field-line boundary. In this work we investigated the daytime radar echo properties near the spectral width boundary using a multi-frequency sounding regime. We have found that the relatively large spectral width values ≥150 m/s observed poleward of the boundary are produced by ionospheric irregularities with lifetime τ₁≃10–25 ms, which is essentially independent of the scale size. These irregularities are statistically co-located with low-energy (~100 eV) electron precipitation, which may play a major role in producing F-region turbulence above 75 MLAT via restructuring the ionospheric plasma on time scales ~τ₁.
Relation
Annales Geophysicae: Atmospheres, Hydrospheres and Space Vol. 25, Issue 3, p. 675-687
Relation
http://www.ann-geophys.net/25/675/2007
Date
2007
Publisher
European Geosciences Union
Keyword(s)
spectral width;  Super Dual Auroral Radar Network (SuperDARN);  radar echo properties;  latitudinal gradient;  multi-frequency sounding
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/27854
Identifier
ISSN:0992-7689
Language
eng
Reviewed
Reviewed
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Subject
"Annales Geophysicae: Atmospheres, Hydrospheres and Space"
 
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