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Table 1 List of authors who derived long-term trends in foF2 and their findings

From: A long-term trend in the F2-layer critical frequency as observed at Alma-Ata ionosonde station

Authors Site: name or number ( N) of stations Years of observation Trends (MHz y-1)
Danilov (2002) Sverdlovsk [56.43°N, 58.57°E] 1948-1994 -0.015
Danilov (2003) N = 21, φ > 30° 1958-mid-nineties -0.012
Danilov (2013) N = 12 1990-2010 -0.024 (1400 local time), -0.054 (after sunset)
Mielich and Bremer (2013) N = 124 1948-2009 -0.003 to 0.0038
Yue et al. (2006) N = 19, [42.9°S to 62.0°N, ca. 130°E] 1948-2005 -0.005
Lastovicka et al. (2006, 2008b) Juliusruh [54.6°N, 13.4°E] 1976-1996 -0.01 to -0.02
Ghabahou et al. (2013) Ouagadougou [12.4°N, 358.5°E] 1966-1998 -0.015
Khaitov et al. (2012) Tomsk [56.5°N, 84.9°E] 1937-2011 -0.008 to -0.014
Mikhailov (2006) Slough [51.48°N, -0.57°E] 1935-2000 -0.00086