Figure 5. (top) The intensity of 486.1-nm H_b emission as a function of time and elevation angle from Poker Flat Research Range between 1100 and 1200 UT on February 1, 1990. (bottom) The total brightness of the H_b emission as a function of time, integrated from horizon to horizon (upper trace) and between 20° and 150° elevation angle from south.

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