Source: Lowell GIRO Data Center · DIDBase (CC-BY-NC-SA 4.0) · giro.uml.edu · NOAA SWPC · pota.app
Ionosonde data: Global Ionospheric Radio Observatory (GIRO). Reinisch, B. W., and I. A. Galkin (2011), Global ionospheric radio observatory (GIRO), Earth, Planets and Space, 63, 377–381, doi:10.5047/eps.2011.03.001. See spase.info/SMWG/Observatory/GIRO.
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