Horizontal and vertical structure of the major sporadic sodium layer events observed during ALOHA-90

Details Horizontal and vertical structure of the major sporadic sodium layer events observed during ALOHA-90 Horizontal and vertical structure of the major sporadic sodium layer events observed during ALOHA-90

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1365k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, July 1991, p. 1365-1368.

Physics

25

Aloha System, Atmospheric Tides, Gravity Waves, Optical Radar, Sporadic E Layer, Vertical Distribution, Atmospheric Composition, Doppler Effect, E Region, Emission Spectra, Hydroxyl Radicals, Oxygen, Sodium

Scientific paper

Sporadic Na, 'Na(s)' layers have been observed frequently at low- and high-altitude sites primarily in the Northern Hemisphere, Na(s) layers are very dense and very thin (about 1 km FWHM) and can form over periods ranging from a few minutes to several hours. Radar and lidar observations by the group at Arecibo have shown conclusively that Na(s) layers are linked to the formation of sporadic E layers. Large Na(s) events were observed on several flights during ALOHA-90 to extend over horizontal distances of approximately 1800 km. Atmospheric tides and gravity waves were observed to have an effect on the vertical motion of these layers. The March 22 event observed from Maui (21 deg N) to near the equator (5 deg N) and the March 27 event, which was observed from Maui (156 deg W) to almost the International Date Line (about 172 deg W), are described.

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