Accession Number : AD0286293

Title :   THE HEIGHT DISTRIBUTION OF THE RATIO OF NEGATIVE ION AND ELECTRON DENSITIES IN THE LOWEST IONOSPHERE

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : HULTQVIST,BENGT

Report Date : 06 MAY 1962

Pagination or Media Count : 1

Abstract : Available experimental data on nondeviative absorption and VLF propagation conditions in the twilight periods are reviewed. It is shown that there are no data to prove that the electron density is appreciably increased when the 60-90 kms altitude range is illuminated by near ultraviolet light but not by ionizing far ultraviolet radiation. Observations of the variation of auroraltype absorption show, on the contrary, that the photodetachment process does not increase the electron density within that height range by more than 10-20%. All observational results referable to the variation of nondeviative absorption and VLF propagation conditions over short distances during twilight periods may be comprehended in terms of O2 as the primary ion in the lowest ionosphere, provided the height distribution of the ratio of negative ion and electron densities is decreased so that even the night profile has the value 1 at a out 60 kms. (Author)

Descriptors :   *IONOSPHERE, ABSORPTION, COSMIC RAYS, DENSITY, ELECTRONS, IONS, RADIO WAVES, VERY LOW FREQUENCY

Distribution Statement : APPROVED FOR PUBLIC RELEASE