The absorption of short radio waves in the D-, E- and f-regions of the ionosphere

摘要: Abstract The published values of the noon absorption radio waves frequencies 2, 2·4, 4 and 4·8 Mc/s measured at Slough from 1947 to 1953 have been analysed. From absorptions 2 2·4 waves, it has deduced that (a) electronic collision frequency vo height maximum electron density in E-region when sun's rays are incident vertically on ionosphere is (1·9 ± 0·1) × 104 per sec; (b) normal D-region increases with increasing sunspot number, whereas additional which occurs certain winter days arises may decrease number. were reflected F-region noon. calculated known total D- E-regions. then be found. At reflection (150 180 km) (3·6 0·6) 103 sec, (180 200 (3·0 sec. significance these results discussed.