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An interpretation of the <i>ƒo</i>F2 and <i>hm</i>F2 long-term trends in the framework of the geomagnetic control concept

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Academic year: 2017

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Fig. 1. Diurnal variation of annual mean slope K for foF2 (left panel) and hmF2 (right panel) trends at auroral, sub-auroral, mid-latitude and lower latitude stations for the 1965–1991 period, invariant latitudes are given in brackets
Fig. 2. Same as Fig. 1, but for correlation coefficients r(δfoF2, Ap 12 ) and r(δhmF2, Ap 12 )
Fig. 3. Observed diurnal variations of NmF2, hmF2 and neutral temperature T n estimated at Millstone Hill at 300 km for quiet 17 March 1990 and disturbed 21 March 1990 days.
Table 1. Calculated thermospheric parameters for quiet 17 March 1990 and disturbed 21 March 1990 days at 300 km and 13.5 LT Date T ex log [O] log [O 2 ] log [N 2 ] β/10 −4 W
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