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Data assimilation result for the storm on August 3, 2010. The bottom panel shows the K p index for the event, showing high activity level beginning near the end of August 3 and continuing into August 5. The top three panels show results for the three FLR station pairs, SUW/BEL (L = 2.4) in panel 1, NUR/TAR (L = 3.3) in panel 2, and MEK/NUR (L = 3.7) in panel 3. In those panels the blue trace represents the plasma density obtained from a reference model using a electric field derived from the K p index. Panels 4 and 5 are results for the Dunedin VLF station. Panel 4 is the density at the innermost L-shell of a VLF whistler group, and panel 5 is at the outermost L-shell. All densities are in cm−3 The red points are the observations. In the case of Dunedin each point represents a different L-shell range, nominally in the L = 3 to L = 4 range. The black traces represent the average assimilation output and the green traces the uncertainty around it. For the FLR stations, which map to a fixed location, assimilation output can be obtained even when no observations are available. For the VLF observations it is not useful to obtain assimilation output without observations because each observations is at a different L-shell.
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