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Alpers et al. 1990
Alpers, M., Höffner, J. and von Zahn, U. (1990). Iron atom densities in the polar mesosphere from LIDAR observations. Geophysical Research Letters 17: doi: 10.1029/90GL02297. issn: 0094-8276.

Between March 24 and April 6, 1990, we performed lidar measurements of iron densities above And¿ya, Norway (69¿N). In each of the five nights of measurements we observed a regular Fe layer which was confined to the altitude region between 80 and 100 km. Its peak Fe densities occurred at (84.5¿1) km or approximately 6 km lower than the peak of the sodium layer as observed by us two weeks earlier. The regular Fe layer exhibited column densities of (9¿4)⋅109 cm-2 and maximum number densities close to 7,000 cm-3. In addition, sporadic Fe layers were observed frequently between 88 and 108 km, one of which reached a maximum number density of 78,000 cm-3 near 97 km altitude. Properties of the Fe layers as observed by us are compared to those observed by Granier et al. [1989> and by Bills and Gardner [1990>. ¿American Geophysical Union 1990

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Abstract

Keywords
Atmospheric Composition and Structure, Ion chemistry of the atmosphere
Journal
Geophysical Research Letters
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Publisher
American Geophysical Union
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