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5577
OH
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01:23 LT
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Figure 7.22 A series of 557.7 nm and OH emission images taken with the Utah State
University Imager on October 10, 1993, in Hawaii (Taylor et al., 1995). The images
show a front approach from the northwest. Note the inverse relationship between the
two emissions. [After Taylor et al. (1995). Reproduced with permission of the American
Geophysical Union.]
the northwest at 23:30 LT. By 0:30 LT the principal features of this event were
apparent. There was a sharp front approaching from the northwest which, in
the 5577 emission (at 96 km), brought with it a sharp decline in the airglow
intensity, whereas in the OH emission (at 87 km), it brought a sharp increase in
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