Accession Number : AD0676967

Title :   THREE WAYS TO TREAT THE IGRF ON THE EARTH'S SURFACE,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Kahle,Anne B.

Report Date : OCT 1968

Pagination or Media Count : 9

Abstract : When an International Geomagnetic Reference Field (IGRF) is adopted in the already agreed upon form based on geocentric coordinates, the problem will arise as to how to represent and use the IGRF on the Earth's surface. The most straightforward and accurate method is to synthesize the values of the field, using the correction factors for the spheroidal shape of the earth. However, some workers may wish to avoid these correction factors, and use the geodetic coordinates directly. There would be two ways to do this. The first is to just ignore the differences in latitude and radius and use the field as if the earth were a sphere of constant radius. The second would be to use 3 different derived sets of coefficients for X, Y, and Z, each of which would accurately give the field value of one element on the earth's surface, but which would not be correct for the others. These three methods are examined here, to find how accurate each is, and how much work is involved in each. (Author)

Descriptors :   (*GEOMAGNETISM, GEODESICS), SPHERES, ELLIPSOIDS, CORRECTIONS, ERRORS, SYMPOSIA

Subject Categories : Geomagnetism
      Geodesy

Distribution Statement : APPROVED FOR PUBLIC RELEASE