Ionospheric long-term trends for South American mid-latitudes |
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| Institution: | 1. 1991 Broadway, 24B, New York, NY 10023, United States of America;2. College of Public Health, The Ohio State University, Cunz Hall, 1841 Neil Ave., Columbus, OH 43210, United States of America;3. Hamilton County Public Health, 250 William Howard Taft Rd; 2nd floor, Cincinnati, OH 45208, USA;1. Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521, USA;2. Department of Botany & Plant Sciences, University of California, Riverside, CA 92521, USA;3. Department of Pathology and Lab Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA |
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| Abstract: | Using ionosonde made observations at Concepción (36.8°S; 73.0°W) for the 1958–1994 interval, long-term trends of critical frequency (foF2) and peak height (hmF2) of the ionospheric F2-layer are analysed. The trends found for different times-of-day and all seasons are consistent with an increasing diurnal-variation amplitude of both foF2 and hmF2. An increasing hmF2 trend of up to 1.5 km/year found between midnight and dawn during winter has no precedent. It is suggested that these long-term amplitude changes may be associated with changes in the prevailing thermospheric meridional neutral winds. |
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