Computer Science
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..20.2075b&link_type=abstract
Advances in Space Research, Volume 20, Issue 11, p. 2075-2083.
Computer Science
17
Scientific paper
Ionospheric plasma parameters are markedly controlled by the variability of the solar radiation and high energetic particle fluxes. Therefore it is necessary to remove these influences by a multiple regression analysis before long-term trends can be detected. Using this method trends have been found in LF phase height and LF absorption data. These trends can be explained by a decrease of the atmospheric pressure near the LF reflection heights (80...85 km) caused by a temperature decrease below this altitude range. Qualitatively the same effect was predicted by Rishbeth (1990) on the basis of model calculations by Roble and Dickinson (1989) for reflection heights deduced from ionosonde measurements of the ionospheric E- and F-layers. Analyses of selected ionosonde standard parameters confirm the predictions, but there are also observations which do not show the expected negative trends. Also in the wind field of the upper mesosphere/lower thermosphere long-term trends could be detected. Especially the amplitudes of the tidal components have markedly been reduced during the last 30 years in all observations available on both hemispheres.
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