Computer Science – Sound
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50...93v&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 50, Feb. 1988, p. 93-104.
Computer Science
Sound
69
Atmospheric Boundary Layer, Neutral Sheets, Sodium, Sporadic E Layer, Time Dependence, Ionospheric Sounding, Laser Applications, Optical Radar
Scientific paper
A sodium lidar instrument located at Andenes, Norway (69 deg N; 16 deg E) observed several sudden developments of narrow sodium layers in the 90-100 km altitude region. These layers grow with typical time constants of 5 min and have a width of 1 km in altitude. The temporal and spatial properties for a number of these events are presented. In a first step toward identifying the processes which create these layers, the correlation of the growth phase of sudden sodium layers and of sporadic E layers is studied. The latter have been recorded by an ionosonde located 129 km east of the lidar site. A strong correlation of simultaneous occurrence of sudden sodium layers and Es-l layers is observed, which establishes a strong link between the formation of the two types of layers. Processes which potentially could give rise to the formation of sudden sodium layers, are discussed.
Hansen Luise Theil
von Zahn Ulf
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