Trends in planetary wave activity inferred from Hungarian radio wave absorption measurements |
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| Authors: | Jan Lastovi?ka Ferenc Märcz |
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| Institution: | (1) Institute of Atmospheric Physics, Acad. Sci. Czech Rep., Prague;(2) Geodetical and Geophysical Institute, Hung. Acad. Sci., Sopron |
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| Abstract: | Summary The nighttime and sunset LF radio wave absorption measured at Nagycenk, western Hungary over 1967–1991 is used to infer planetary wave activity and its long-term trend in the upper middle atmosphere ( 85 – 100 km). The very moderate positive and mostly statistically insignificant trends are consistent with the pattern provided by previous analyses of various day- and night-time absorption measurements. The trends could be of anthropogenic origin. |
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| Keywords: | Lower ionosphere planetary waves long-term trends |
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