HF radar signatures of the cusp and low-latitude boundary layer
Citations
690 citations
Cites background or methods or result from "HF radar signatures of the cusp and..."
...…vortical convection structures generated by filamentary FACs (Schiffler et al. 1997; Huber and Sofko 2000), intense particle precipitation (Baker et al. 1995; Ponomarenko and Waters 2003) which can result in strong spatial and temporal non-uniformity in ionospheric irregularities, and…...
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...1997; Huber and Sofko 2000), intense particle precipitation (Baker et al. 1995; Ponomarenko and Waters 2003) which can result in strong spatial and temporal non-uniformity in ionospheric irregularities, and low-frequency (*0....
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...The latitudinal transition between these two spectral width regions became known as the SWB and case study comparisons with datasets from other instrumentation showed the SWB to be a good proxy for the equatorward edge of the cusp (Baker et al. 1995; Rodger et al. 1995; Yeoman et al. 1997a; Milan et al. 1999b), and hence for the dayside OCB....
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...PACE was particularly successful in studies of the cusp, identifying signatures of the cusp in HF backscatter (Baker et al. 1995), illustrating the differences in transitions in the cusp-region convection pattern in the two hemispheres in response to changes in the direction of the y-component of…...
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...Baker et al. (1995) first studied the distributions of dayside spectral width values, suggesting that the distribution of values seen poleward of the SWB in the cusp region was approximately Gaussian (with a mean value of *220 m/s) and the distribution of values seen equatorward of the SWB in the…...
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211 citations
Cites background from "HF radar signatures of the cusp and..."
...For instance, a boundary between low spectral width echoes at lower latitudes and high spectral width echoes poleward of this has been identified with the OCB, on both the dayside (Baker et al., 1995) and the nightside (Lester et al., 2001)....
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128 citations
Cites methods from "HF radar signatures of the cusp and..."
...The spectral width and line-of-sight velocity observed by the Prince George SuperDARN over Cambridge Bay on 8 January 2008 were particularly enhanced between 19:25 and 20:30 UT, which is typical of the HF backscatter in the cusp (Baker et al., 1995)....
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118 citations
Cites background or methods from "HF radar signatures of the cusp and..."
...Using a spectral width criterion for identifying the HF signature of the cusp and LLBL (Baker et al., 1995), we can identify the region of pulsed antiSunward convecting backscatter as mapping to open ®eld lines and the region of continuous Sunward convecting backscatter as mapping to closed ®eld lines....
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...The transients themselves were observed to have broad spectral widths and were ®rst observed within regions of low spectral width (identi®ed as the LLBL), up to three degrees equatorward of a region of high spectral width (identi®ed as the cusp), into which they propagated over a 10 min period....
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...They stated that the distribution of spectral widths in the cusp is generally of a Gaussian form with a peak at 220 m s)1, while the distribution of spectral widths in the LLBL is more likely to be an exponential distribution, with the peak of the distribution occurring at 50 m s)1....
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...Equatorward of the opened/closed ®eld line boundary, steady energetic electron precipitation associated with the low-latitude boundary layer is known to produce continuous backscatter (Baker et al., 1995), allowing us to observe continuously the modulated velocity within the convective plasma ¯ow....
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...Baker et al. (1990, 1995) have identi®ed the HF radar signature of the low-latitude boundary layer (LLBL) and the cusp, using the spectral width distribution of backscattered l-o-s velocities observed by the Halley HF radar and low-latitude particle precipitation data from the DMSP spacecraft....
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103 citations
References
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