Mathematics – Logic
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14...76v&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, Jan. 1987, p. 76-79.
Mathematics
Logic
64
Atmospheric Composition, Dust, Sodium, Upper Atmosphere, Auroral Zones, Density (Number/Volume), E Region, Optical Radar, Radar Data
Scientific paper
The almost explosive growth of narrow sodium layers at altitudes near 95 km was observed by ground-based LIDAR located at 69 deg N, 16 deg E. Starting from typical conditions at these altitudes (sodium density of approximately 1000-2000/cu cm), the density is observed to increase by large factors within a few minutes in a narrow layer, the half height of which is typically 1 km only. One of the more spectacular cases involved an increase by a factor of 25 within 5 min and a layer width of 0.8 km (full width at half maximum). It is proposed that sodium forming these sudden layers is released from upper atmospheric dust by energetic auroral particles. Prior to the auroral bombardment the dust particles were concentrated into a narrow layer by appropriate meteorological processes. The observations thus imply that considerable amounts of sodium are stored on the surface of upper atmospheric dust.
Hansen Galen
von der Gathen Peter
von Zahn Ulf
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