Advances In Ionospheric Mapping By Numerical Methods
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Advances in Ionospheric Mapping by Numerical Methods
Paper describes recent progress made at ITSA (formerly CRPL) to improve numerical methods for mapping and predicting ionospheric characteristics used in telecommunication. Two major problems are considered; (1) tendency of maps to smooth out physical properties of the ionosphere, particularly at low latitudes and (2) ambiguous values at geographic poles and resulting distortions in immediate surroundings. The second problem is overcome by means of a universal time analysis. Significant improvement is made in the first problem by the use of a modified magnetic dip coordinate. A general description is given of the new procedures for forming numerical maps, including a number of illustrations. Also included are a discussion of the use of numerical maps in the revised form and a Fortran Program for evaluating numerical maps of ionospheric characteristics and for calculating the MUF(SERO)F2 and MUF(4000)F2.