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Comparison of scaled daily NmF2 (red squares) and hmF2 (green squares) averages with the daily sunspot number R (top, blue squares) and daily solar flux F10.7 index (bottom, blue squares) during the study period (10 June 2006–29 April 2014). The unit of the y-axis units refers to the sunspot number and F10.7 and the NmF2 as well as hmF2 samples have been scaled.
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