Ionospheric long-term trends for South American mid-latitudes

Details Ionospheric long-term trends for South American mid-latitudes Ionospheric long-term trends for South American mid-latitudes

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jastp..61..717f&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 61, Issue 9, p. 717-723.

Physics

12

Scientific paper

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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