Occurrence and lifetimes of discrete auroras near midnight

Physics

Scientific paper

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All Sky Photography, Auroras, Night Sky, Polar Regions, Airborne Equipment, Flight Paths, Geomagnetic Latitude, Time Response

Scientific paper

All-sky camera photographs from flights of the AFGL airborne ionospheric observatory have been used to investigate discrete auroras in the midnight sector of the auroral oval. The photographs were taken at intervals of 1 min throughout flight durations of 5-10 hours near 69 deg (plus or minus 4 deg) corrected geomagnetic latitude; the 12 flights totaling 93 hours provide about 5600 frames. For each flight the photographs have been assembled into a montage format which permits perception of individual frames and also, in the aggregate, reveals individual events of auroral activation with measurable lifetimes. The discrete auroras observed in this way, when classified into four categories of activity, active, moderate, quiet, and no discrete aurora visible, exhibit frequencies of occurrence of 22, 37, 24, and 17%, respectively.

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