Evidence for long-term cooling of the upper atmosphere in ionosonde data

Details Evidence for long-term cooling of the upper atmosphere in ionosonde data Evidence for long-term cooling of the upper atmosphere in ionosonde data

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1103u&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 9, p. 1103-1106

Physics

66

Ionosphere: Ionosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Evolution Of The Atmosphere, Global Change: Atmosphere

Scientific paper

While several model estimates predict cooling of the upper atmosphere as a result of increasing concentrations of greenhouse gases, direct observational evidence of such a trend is scarce and partly susceptible, because the relevant data series do not cover sufficiently long time periods. We study the long-term data set from the ionosonde station at Sodankylä (67.4°N, 26.7°E), which has been operated during almost 4 solar cycles. We find a close to linear decrease in the altitude of the F2 layer peak during the last 39 years, when the effect of solar cycle variations is removed from the data. This local trend is qualitatively consistent with the model predictions of a cooling of the lower thermosphere.

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