Figure 3. The intensity of 557.7-nm [OI], 427.8-nm N2+, 486.1-nm Hbeta, and 630-nm [OI] emissions as a function of time and elevation angle from the south horizon at Poker Flat Research Range on February 1, 1990. To facilitate easy comparison of the relative location of the electron and hydrogen arcs, we have added two dashed lines that enclose the onset arc location. The dotted line indicates the location of the diffuse aurora (trapping boundary). The magnetic zenith is marked with a short horizontal line.
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