Long-term and solar cycle changes in the atmospheric sodium layer

Details Long-term and solar cycle changes in the atmospheric sodium layer Long-term and solar cycle changes in the atmospheric sodium layer

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.1673c&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, v. 59, p. 1673-1678.

Physics

12

Scientific paper

A new analysis of atmospheric sodium measurements, made at São José dos Campos (23°S, 46°W) since 1972, confirms the previously detected trend in the centroid height of the layer (near 92 km altitude) and shows the existence of a 10-yr solar-cycle related oscillation. The centroid height fell at an average rate of 37 +/- 9 m yr-1 between 1972 and 1994, and the 10-yr cycle has an amplitude of 170 +/- 110 m. An analysis of the vertical distribution of atmospheric sodium shows that the fall in height of the centroid is not caused by a simple vertical displacement of the sodium profile, but by the growth of a bulge on the bottomside of the layer.

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