Lidar, radar and airglow observations of a prominent sporadic Na/sporadic E layer event at Arecibo during AIDA-89

Details Lidar, radar and airglow observations of a prominent sporadic Na/sporadic E layer event at Arecibo during AIDA-89 Lidar, radar and airglow observations of a prominent sporadic Na/sporadic E layer event at Arecibo during AIDA-89

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55..499k&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 3, p. 499-511.

Physics

49

Airglow, Atmospheric Ionization, Ionospheric Electron Density, Ionospheric Ion Density, Optical Radar, Sodium Vapor, Sporadic E Layer, Electron Density Profiles, Incoherent Scatter Radar, Ionic Reactions, Photometry, Thermosphere, Zonal Flow (Meteorology)

Scientific paper

Sporadic Na (Na(s)) layer events were frequently identified during 160 h of lidar observations at Arecibo in January, March, and April 1989. Most were accompanied by sporadic E (E(s)) layers. The most spectacular Na(s)/E(s) event occurred on the night of 30-31 March when both the Na and electron abundances between 90 and 100 km increased by approximately 700 percent during a period of 2.25 h starting at 2100 LST. The vertical and temporal structure of the Na and electron densities were remarkably similar during the event. The ratio of the average Na enhancement to the electron density varied from a maximum of 3.5 Na atoms/electron at 98 km to about 0.5 Na atoms/electron below 94 km. Between 93 and 97 km the electron enhancement preceded the Na enhancement by 15-30 min. Above 97 km and below 93 km the Na and electron density variations were in phase. The data suggest that the E(s) layer triggered the release of Na from a reservoir, but the E(s) layer was not the source of the major Na(s) layer.

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