The networks of HF coherent backscatter radars known as SuperDARN measure ionospheric LOS Doppler velocities over a large portion of the northern and southern hemispheres [Greenwald et al., 1995]. The northern component of SuperDARN has recently been augmented with two new radars in British Columbia, Canada and Kodiak Island, Alaska. The additional radars extend the coverage of the network to include western North America (see Figure 1 and Table 1). This study focuses on a particular period during which SuperDARN measurements were available over a region of the northern hemisphere that extended over 18 hours of magnetic local time (MLT) or nearly 3/4 of the high latitude ionosphere.
|CUTLASS /Finland||F||Hankasalmi, Finland||University of Leicester||62.32||26.61||April 1995|
|CUTLASS /Iceland||E||Pykkvibær, Iceland||University of Leicester||63.77||-20.54||Dec. 1995|
|Iceland West||W||Stokkseyri, Iceland||CNRS||63.86||-20.02||Oct. 1994|
|Goose Bay||G||Labrador, Canada||JHU/APL||53.32||-60.46||June 1983|
|Kapuskasing||K||Ontario, Canada||JHU/APL||49.39||-83.32||Sept. 1993|
|Saskatoon||T||Saskatchewan, Canada||University of Saskatoon||52.16||-106.53||Sept. 1993|
|Prince George||B||British Columbia, Canada||University of Saskatoon||53.98||-122.59||Mar. 2000|
|Kodiak||A||Kodiak Island, Alaska||UAF||57.62||-152.19||Jan. 2000|
In order to demonstrate that definitive global solutions of are now possible with direct measurements of convection, we show that given sufficient coverage, as in the case for the period selected, the solution of is insensitive to the selection of statistical model data. The fitting technique, further explained in the the text, used to construct a global solution of over the region >50, is applied to the SuperDARN data in combination with a wide variety of statistical model patterns. The lack of any significant differences in the resulting solutions of demonstrate that and hence, , are largely constrained by the measurements alone.