On the height distribution of the ratio of negative ion and electron densities in the lowest ionosphere

摘要: Recent observations of very small variations auroral type absorption in the twilight periods are taken as basis for a study height distribution ratio densities negative ions and free electrons. It has been found that there no experimental data to definitely prove electron density is appreciably increased when 70–100 km altitude range illuminated by visual or near ultraviolet light but not ionizing far radiation. Possible interpretations discussed one them some detail. The conclusion presently existing consistent observational resulta referable variation nondeviative radio propagation conditions during can be comprehended terms O2− primary ion lowest ionosphere, provided densities, λ, decreased so even night profile value 1 at about 60 km.