Accession Number : AD0757341

Title :   Computer Techniques for Fitting Electron Density Profiles to Oblique-Path VLF Propagation Data.

Descriptive Note : Research and development rept. Jan 70-Oct 72,

Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF

Personal Author(s) : Morfitt,D. G.

Report Date : 16 JAN 1973

Pagination or Media Count : 40

Abstract : A procedure which makes use of digital computer computational efficiency and versatility was developed to obtain best-fit electron density profiles which describe vlf propagation data. The procedure determines profiles which in some instances describe measured field strength levels very well. In cases in which the best-fit profile error proved to be large, it is probable that smaller errors would be found for computations based on profile shapes not included. As field strength levels are computed as a function of frequency for various other trial profiles, they may be added to the results obtained to date. A completed data bank of this form should be of significant use in determining the electron density profiles characteristic of the ionosphere for propagation measurements made during various seasons over the Hawaii-Southern California path. The same procedure can also be used to interpret vlf propagation data obtained over other horizongally homogeneous propagation paths. (Author)

Descriptors :   (*IONOSPHERIC PROPAGATION, VERY LOW FREQUENCY), (*IONOSPHERE, ELECTRON DENSITY), PERIODIC VARIATIONS, CURVE FITTING, GRAPHICS, CALIFORNIA, HAWAII, DIGITAL COMPUTERS

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE