Sudden sodium layers in polar latitudes

Details Sudden sodium layers in polar latitudes Sudden sodium layers in polar latitudes

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..585h&link_type=abstract

(EISCAT Scientific Association, International EISCAT Workshop, 4th, Sigtuna, Sweden, June 5-9, 1989) Journal of Atmospheric and

Physics

61

Atmospheric Composition, Polar Regions, Sodium, Sudden Ionospheric Disturbances, E Region, Meteor Trails, Meteoroid Showers, Optical Radar, Riometers

Scientific paper

This paper discusses sudden sodium layers (SSLs), which are observed with an Na lidar instrument at Andenes, Norway. There is an SSL if, in a narrow altitude range (typically less than 2 km), the Na density increases over the normal Na density by a factor of at least 2 within 5 min. Between December 1985 and November 1987, 42 such layers were observed in 378 h of lidar measurements. This number increases to 75 if only an increase of a factor of 1.5 within 8 min is required. SSLs have the following properties: (1) they develop between 90 and 110 km altitude; (2) they develop between 20 and 02 LT; (3) their appearance shows a strong positive correlation with that of f-type Es layers; and (4) their appearance does not show a strong correlation with either riometer absorption or meteor showers.

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