Results 91 to 100 of about 6,743 (215)
Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.Abstract The Curie point depth (CPD), a key indicator of the lithosphere's thermal structure, is typically estimated using spectral analysis or interface inversion methods. However, these approaches often neglect the effects of remanent magnetization, leading to substantial uncertainty.
Like Ma, Jun Wang
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Geomagnetic Secular Variation Anomalies in the GDR
Journal of geomagnetism and geoelectricity, 1978 For about 25 years, measurements of the magnetic components have been carried out at repeat stations in the territory of the GDR. All measurements at common stations of the magnetic surveys for the epochs 1901, 1935, and 1957 were compared. The results of the investigation indicate secular variation anomalies with amplitudes of about 3–4 nT/year. These
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Scaling of the geomagnetic secular variation timescale
Geophysical Journal InternationalSUMMARY The ratio of the magnetic power spectrum and the secular variation spectrum measured at the Earth’s surface provides a timescale $\tau _{\rm sv}(l)$ as a function of spherical harmonic degree l. $\tau _{\rm sv}$ is often assumed to be representative of timescales related to the dynamo inside the outer core and its scaling with l ...
Yue-Kin Tsang, Chris A Jones
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Jovimagnetic secular variation [PDF]
Long term variations of a planetary magnetic field are one of the few observables available in the study of planetary interiors and dynamo theory. While variations of the geomagnetic field were accessible to direct measurement for centuries, knowledge of
Acuna, M. H., Connerney, J. E. P.
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Data Science Journal, 2011 There is a need to develop secular variation (SV) models using satellite data as the use of ground data is not always possible. Ground data has many limitations including limited data points and lack of data over ocean areas that are not easily ...
E Nahayo, P B Kotzé, M J Alport
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Geomagnetic Secular Variation at the Indian Observatories.
Journal of geomagnetism and geoelectricity, 1997 Annual mean values of geomagnetic field components D, H and Z for all days and quiet days at six observatories are analysed to investigate the secular variations and geomagnetic jerks in the Indian region. Secular trends show a region of demarkation between equatorial and low latitude stations.
S. K. Bhardwaj, G. K. Rangarajan
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Potential utility of future satellite magnetic field data [PDF]
The requirements for a program of geomagnetic field studies are examined which will satisfy a wide range of user needs in the interim period between now and the time at which data from the Geopotential Research Mission (GRM) becomes available, and the ...
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Annals of Geophysics, 2002 The Earth's magnetic field varies over a wide range of characteristic times, say, from years to centuries, and more. In order to detect some nonlinear features of the geomagnetic field evolution we first apply a nonlinear spectral technique, i.e ...
A. De Santis, R. Tozzi
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Report on the magnetic survey in Slovakia for the 2014.5 epoch
Contributions to Geophysics and Geodesy, 2016 The models of the distribution of the elements of the geomagnetic field must be updated regularly. For this purpose geomagnetic measurements have to be carried out repeatedly at geomagnetic observatories as well as at temporary observation points.
Fridrich VALACH +3 more
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Secular variation of Geomagnetic Elements at Alibag-
MAUSAM, 1969 Attempts are made to represent secular variations of geomagnetic elements (H. Z and D) of Alibag by fitting polynomials of third order to the observed annual mean values for the years 1905-65. The coefficients of the fitted curve account for more than 99 percent of the total variation in case of H and D and 98 per cent in case of z.
DRK RAO, RK BANSAL
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