Accession Number : ADA310393

Title :   The World Magnetic Survey.

Descriptive Note : Technical rept.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIG HT CENTER

Personal Author(s) : Heppner, James P.

PDF Url : ADA310393

Report Date : JAN 1964

Pagination or Media Count : 47

Abstract : The mathematical and graphical description of the earth's main field has been, and is, a 'data limited' problem. The World Magnetic Survey (WMS) is an endeavor to minimize this limitation by rapidly and comprehensively blanketing the earth with magnetic field measurements. Satellite surveys, which will play a key role in the WMS, are the principal topic of this paper. Existing magnetic field descriptions, the expected results from new surveys, and the methods of obtaining these results with the POGO satellite are emphasized. It is anticipated on the basis of extrapolation from Vanguard III results and other considerations that a factor-of-10 improvement will be obtained. This means that the average errors of 1 to 3 percent now present in field charts and spherical harmonic descriptions should be reduced to 0.1 to 0.3 percent as a result of the survey.

Descriptors :   *GEOMAGNETISM, *MAGNETIC FIELDS, EARTH ORBITS, ACCURACY, CHARGED PARTICLES, ERROR ANALYSIS, DATA REDUCTION, MAPPING, CHARTS, EARTH SURFACE, DIURNAL VARIATIONS, FIELD INTENSITY, MAGNETOSPHERE, SYNCHRONOUS SATELLITES, EXTRAPOLATION, MAGNETIC ANOMALIES, HARMONIC ANALYSIS, MAGNETIC DIPOLES, SCIENTIFIC SATELLITES, MAGNETOMETERS, AERIAL SURVEYS.

Subject Categories : Geomagnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE