THE SUNRISE EFFECTS IN THE E AND F LAYERS OF THE IONOSPHERE,
EMMANUEL COLL BOSTON MASS RESEARCH LANGUAGE CENTER
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Ionograms from Station JuliusruhRugen in East Germany, recorded one minute before and after sunrise during the period November 1958 - October 1959, are analyzed. It is concluded that the E2 layer is a normal layer, controlled purely by solar ultraviolet radiation. The annual variation of the solar height during primary ionization is irregular, whereas the solar height of the F layer has a regular annual variation. A theoretical study of these results shows that there is no screening layer capable of strongly absorbing the relevant solar ultraviolet radiation for both the F and E layers. The maximum electron production rates of the E1 layer for all months and the extra-terrestrial intensities of the solar L sub beta-radiation related to this layer are calculated. The cause of the E2 layer formation is also examined.