F2-layer parameters long-term trends at the Argentine Islands and Port Stanley stations

• Published in: Annales Geophysicae
• Main Authors: A. D. Danilov, A. V. Mikhailov
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications 2001
• Subjects: Science; Q; Physics; QC1-999; Geophysics. Cosmic physics; QC801-809; Argentine; Argentine Islands
• Online Access: https://doi.org/10.5194/angeo-19-341-2001; https://doaj.org/article/b16acd88713f49219859f7ca6a0e5b7c

The ionospheric sounding data at two southern hemisphere stations, the Argentine Islands and Port Stanley, are analyzed using a method previously developed by the authors. Negative trends of the critical frequency fo F2 are found for both stations. The magnitudes of the trends are close to those at the corresponding (close geomagnetic latitude) stations of the northern hemisphere, as considered previously by the authors. The values of the F2 layer height hm F2 absolute trends Δ hm F2 are considered. The effect of Δ hm F2 dependence on hm F2 found by Jarvis et al. (1998) is reproduced. A concept is considered that long-term changes of the geomagnetic activity may be an important (if not the only) cause of all the trends of fo F2 and hm F2 derived by several groups of authors. The dependence of both parameters on the geomagnetic index Ap corresponds to a smooth scheme of the ionospheric storm physics and morphology; thus, a principal cause of the f oF2 and hm F2 geomagnetic trends is most probably a trend found in several publications in the number and intensity of ionospheric storms. Key words. Ionosphere (ionosphere-atmosphere interaction; ionospheric disturbances)