In:
Geophysical Research Letters, American Geophysical Union (AGU), Vol. 17, No. 13 ( 1990-12), p. 2345-2348
Abstract:
Between March 24 and April 6, 1990, we performed lidar measurements of iron densities above Andøtya, 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) ·10 9 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] .
Type of Medium:
Online Resource
ISSN:
0094-8276
,
1944-8007
DOI:
10.1029/GL017i013p02345
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1990
detail.hit.zdb_id:
2021599-X
detail.hit.zdb_id:
7403-2
SSG:
16,13
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