ANALYSIS OF LOW LATITUDE D AND E REGION DATA.
Semi-annual technical rept., 15 Nov 65-15 May 66,
IIT RESEARCH INST CHICAGO ILL
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Analyses of ionograms, high frequency phase and amplitude data and riometer measurements of absorption which will lead to a better determination of the D and E region electron density profile for low latitude regions are described. True height analyses of sample ionograms allows determination of the contribution of the F region to 30 MHz absorption as determined from the riometer data. The topside F region is fit by a Chapman layer and F region temperature effects are qualitatively considered to show that the computer absorption from the F region tends to be a maximum estimate for that region. The computation of diurnal absorption variation from the 30 MHz riometer data requires that the cosmic noise power which would be received in the absence of absorption be computed. A program which has been developed to predict the cosmic noise diurnal variation given a particular site and antenna pattern has been improved and the results to date are described. The separation of E and F region reflection modes by comparison of the phase data with ionogram virtual group paths for the same frequencies shows that the different modes can be separated in the data with little ambiguity. Theory which forms the basis of the analysis of phase, amplitude, group path, and absorption data is summarized and two sample analyses are performed to show the sensitivity of the Faraday fading data to small changes in electron content along the signal path. The group and phase data are compared with the amplitude results to show their relationship and the means of identifying the height of variation of electron content along a propagation path. Author
- Atmospheric Physics
- Radiofrequency Wave Propagation