Results 171 to 180 of about 5,592 (185)

On IGRF models for 1945–1985

Physics of the Earth and Planetary Interiors, 1987
Abstract Several candidate models for 1945 are compared and models for 1945–1990 are estimated in terms of the eccentric dipole.
N.P. Ben'kova, T.N. Bondar', V.P. Golovkov, G.I. Kolomiitseva   +3 more
openaire   +1 more source

A computation of IGRF over Nigeria

Global Journal of Geological Sciences, 2008
No Abstract. Global Journal of Geological Sciences Vol. 5 (1&2) 2007: pp.
Likkason, O K, Ajayi, C O, Shemang, E M
openaire   +2 more sources

Evaluation of IGRF candidate models over the Australian region

Physics of the Earth and Planetary Interiors, 1987
Abstract Observations of declination made at magnetic observatories and repeat stations distributed throughout the Australian region are used to assess the candidate main field models proposed for the IGRF epochs 1945, 1950, 1955, 1960 and 1980.
D.E. Winch, A.J. McEwin, C.E. Barton
openaire   +1 more source

A preliminary assessment of the IGRF-1990 for Mexico

Physics of the Earth and Planetary Interiors, 1994
Abstract A preliminary assessment of the IGRF-1990 in Mexico is carried out by comparing geomagnetic elements measured throughout Mexico and IGRF derived geomagnetic values. Mean differences of 10.6 nT, 24.4 nT, and −0.6′ are obtained for total intensity, horizontal component, and declination (RMS deviations of 206 nT, 116 nT, and 18.7′, respectively)
J.O. Campos-Enriquez, E. Hernandez-Quintero, H. Nolasco-Chávez, A. Orozco-Torres, C. Cañon-Amaro, G. Alvarez-García, J. Urrutia-Fucugauchi   +6 more
openaire   +1 more source

Evaluation of the 1985–1990 IGRF secular variation candidates

Physics of the Earth and Planetary Interiors, 1987
Abstract The IGRF secular variation model for 1985–1990 was adopted by the International Association of Geomagnetism and Aeronomy at its Prague meeting in August 1985 as an average of the three candidate models submitted to the committee. We compared the three models at epoch 1985.0 against each other and against a new model based on observatory data
Joseph C. Cain, Christopher Kluth
openaire   +1 more source

IGRF comparisons

Physics of the Earth and Planetary Interiors, 1978
E. Dawson, L.R. Newitt
openaire   +2 more sources

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2018
The maps of components of the main magnetic field for 1960, 1995 and 2000 and its secular variations for epoch 1958 and 1997,5 for Antarctic, constructed on supervision on the Antarctic observatories with 1958 on 2003 and to modelling calculations of a magnetic field by IGRF coefficients are presented.
openaire   +1 more source

The Analysis of the IGRF Error in the China Continent

Chinese Journal of Geophysics, 2003
AbstractIGRF (International Geomagnetic Reference Field) are the models of geomagnetic main field and secular variation. The IGRF errors are from the neglecting external field, the truncation of the spherical harmonic progress, the asymmetry of the observatory distribution, the measure, and the neglecting of the crust geomagnetic anomalies.
openaire   +1 more source

IGRF 1945–1980 model coefficients (1988)

Planetary and Space Science, 1992
R.A. Langel, D.R. Barraclough
openaire   +1 more source