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Some Results of a Mode‐Conversion Program for VLF
Author(s) -
Pappert Richard A.,
Snyder Floyd P.
Publication year - 1972
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs007i010p00913
Subject(s) - ionosphere , allowance (engineering) , daytime , amplitude , sunrise , computational physics , exponential function , physics , mode (computer interface) , multi mode optical fiber , scale height , meteorology , geodesy , geophysics , optics , atmospheric sciences , geology , mathematics , computer science , mathematical analysis , mechanical engineering , optical fiber , engineering , operating system
A mode‐conversion program has been developed which allows for the vertical inhomogeneity of the ionosphere as well as its anisotropy. As an illustration of the potential use of the program for diagnostic studies at VLF, the sunrise amplitude study of Walker [1965] is numerically modelled with allowance for four modes. Exponential profiles of varying reference height and scale height are used to simulate the terminator. Of the models studied, best agreement is obtained with a terminator thickness of 1000 km. Despite the multimode nature of the models, Crombie's [1964] model is found to be valid for the path studied. This is because of weak conversion from the third and fourth nighttime modes to the first daytime mode.