A technique for accurately determining the cusp-region polar cap boundary using SuperDARN HF radar measurements
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690 citations
Cites methods from "A technique for accurately determin..."
...A better understanding of these spectral width distributions led to the development of a reliable and objective method for determining the SWB known as the ‘C-F threshold technique’ (Chisham and Freeman 2003, 2004)....
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74 citations
Additional excerpts
...…spectral width of a radar backscatter echo in comparison with closed field lines (e.g. Baker et al., 1995; Milan et al., 1999, 2000; Moen et al., 2001, 2002; Chisham and Freeman, 2003, 2005; Oksavik et al., 2004) and therefore the spectral width of radar backscatter can be used to identify the OCB....
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69 citations
Cites methods from "A technique for accurately determin..."
...Any modification to the technique must also address the problem identified byChisham and Freeman (2004) of occasional boundary misidentifications when there is no low spectral width region equatorward of an isolated high spectral width region....
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...Hence, we would argue that the uncertainty of the OCB location determined from SWB measurements is similar to that of the measurement of the SWB location itself, which is ∼1◦ latitude (Chisham and Freeman, 2003)....
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...By determining the probability distribution of the SWB with latitude and MLT,Chisham and Freeman (2004) showed how the preferred latitudinal location of SWBs in data measured by the Halley SuperDARN radar became less clearly defined in the afternoon sector ionosphere (see their Fig. 12). As we are using data from the Goose Bay and Finland SuperDARN radars in this study, we first present the equivalent latitudeMLT probability distributions for the SWB locations identified by the Goose Bay and Finland radars for the 5-year SWB database. Full details regarding the determination of these distributions are presented in Chisham and Freeman (2004) (see their Sec....
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...We employ the “C-F threshold technique” to identify the SWB (Chisham and Freeman, 2003, 2004)....
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...This preprocessing increases the accuracy of the estimated SWB location by effectively thinning the distributions of spectral width found poleward and equatorward of the SWB, making it easier to distinguish between them (Chisham and Freeman, 2003)....
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62 citations
Cites background from "A technique for accurately determin..."
..., 1991, 1996; Sotirelis and Newell, 2000) and measurements from incoherent and coherent scatter radars (Baker et al., 1995; Blanchard et al., 1996, 2001; Milan et al., 1999; Chisham et al., 2001, 2002; Lester et al., 2001; Chisham and Freeman, 2003), or a combination of all of these (Milan et al....
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...…1996; Sotirelis and Newell, 2000) and measurements from incoherent and coherent scatter radars (Baker et al., 1995; Blanchard et al., 1996, 2001; Milan et al., 1999; Chisham et al., 2001, 2002; Lester et al., 2001; Chisham and Freeman, 2003), or a combination of all of these (Milan et al., 2003)....
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57 citations
Cites methods from "A technique for accurately determin..."
...…width backscatter in the cusp correlates well with the equatorward edge of cusp particle precipitation and so is often used as a proxy for the ionospheric projection of the merging line (which equates to the polar cap boundary under those conditions) (Baker et al., 1995; Chisham and Freeman, 2003)....
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References
3,818 citations
"A technique for accurately determin..." refers background in this paper
...The polar cap boundary (PCB) in the cusp ionosphere represents the ionospheric projection of the separatrix between newly-opened and closed geomagnetic field lines (Dungey, 1961) across which mass, momentum, energy and magnetic flux are transferred during dayside reconnection....
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1,051 citations
"A technique for accurately determin..." refers background in this paper
...SuperDARN (The Super Dual Auroral Radar Network) is a network of coherent scatter HF radars (Greenwald et al., 1995) which measure backscatter from magnetic field-aligned decametre-scale ionospheric iregularities....
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...SuperDARN is a network of HF radars designed to determine the large-scale convection electric field in the polar ionospheres (Greenwald et al., 1995)....
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452 citations
401 citations
299 citations
"A technique for accurately determin..." refers background or methods in this paper
...…magnetometer observations of ULF wave characteristics have also been used to identify the location of the cusp (Menk et al., 1992) but are unlikely to resolve the PCB to better than 2◦ due to spatial integration effects (Southwood and Hughes, 1983) and typical magnetometer separation distances....
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...to resolve the PCB to better than 2 ◦ due to spatial integration effects (Southwood and Hughes, 1983) and typical magnetometer separation distances....
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