Ionospheric local model and climatology from long-term databases of multiple incoherent scatter radars
Résumé
Empirical ionospheric local models have been
developed from long-term data sets of seven incoherent
scatter radars spanning invariant latitudes from 25 to 75 in
American, European and Asian longitudes at Svalbard,
Tromsø, Sondrestrom, Millstone Hill, St. Santin, Arecibo
and Shigaraki. These models, as important complements to
global models, represent electron density, ion and electron
temperatures, and ion drifts in the E and F regions, giving a
comprehensive quantitative description of ionospheric
properties. A case study of annual ionospheric variations
in electron density and ion temperature is presented based
on some of these models. Clear latitudinal, longitudinal, and
altitude dependency of annual and semiannual components
are found.
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