- Title
- Factors determining spectral width of HF echoes from high latitudes
- Creator
- Ponomarenko, P. V.; Waters, C. L.; Menk, F. W.
- Relation
- Annales Geophysicae: Atmospheres, Hydrospheres and Space Vol. 25, Issue 3, p. 675-687
- Relation
- http://www.ann-geophys.net/25/675/2007
- Publisher
- European Geosciences Union
- Resource Type
- journal article
- Date
- 2007
- 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.
- Subject
- spectral width; Super Dual Auroral Radar Network (SuperDARN); radar echo properties; latitudinal gradient; multi-frequency sounding
- Identifier
- http://hdl.handle.net/1959.13/27854
- Identifier
- uon:1998
- Identifier
- ISSN:0992-7689
- Language
- eng
- Full Text
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