scholarly journals ITalian Geomagnetic Reference Field (ITGRF): update for 2000 and secular variation model up to 2005 by autoregressive forecasting

2009 ◽  
Vol 46 (3) ◽  
Author(s):  
A. De Santis ◽  
L. Gaya-Piqué ◽  
G. Dominici ◽  
A. Meloni ◽  
J. M. Torta ◽  
...  
Keyword(s):  
Secular Variation ◽  
Reference Field ◽  
Secular Variation Model ◽  
Variation Model

scholarly journals Bulgarian Geomagnetic Reference Field (BulGRF) for 2015.0 and secular variation prediction model up to 2020

2017 ◽  
Vol 35 (5) ◽  
pp. 1085-1092
Author(s):  
Metodi Metodiev ◽  
Petya Trifonova
Keyword(s):  
Secular Variation ◽  
Geomagnetic Field ◽  
Field Model ◽  
Field Measurements ◽  
Reference Field ◽  
Main Field ◽  
Close Match ◽  
Secular Variation Model ◽  
Geomagnetic Field Models ◽  
Annual Means

Abstract. The Bulgarian Geomagnetic Reference Field (BulGRF) for 2015.0 epoch and its secular variation model prediction up to 2020.0 is produced and presented in this paper. The main field model is based on the well-known polynomial approximation in latitude and longitude of the geomagnetic field elements. The challenge in our modelling strategy was to update the absolute field geomagnetic data from 1980.0 up to 2015.0 using secular measurements unevenly distributed in time and space. As a result, our model gives a set of six coefficients for the horizontal H, vertical Z, total field F, and declination D elements of the geomagnetic field. The extrapolation of BulGRF to 2020 is based on an autoregressive forecasting of the Panagyurishte observatory annual means. Comparison of the field values predicted by the model with Panagyurishte (PAG) observatory annual mean data and two vector field measurements performed in 2015 shows a close match with IGRF-12 values and some difference with the real (measured) values, which is probably due to the influence of crustal sources. BulGRF proves to be a reliable alternative to the global geomagnetic field models which together with its simplicity makes it a useful tool for reducing magnetic surveys to a common epoch carried out over the Bulgarian territory up to 2020.

Secular Variation Model

2007 ◽  
pp. 892-902 ◽  
Author(s):  
Christopher G.A. Harrison
Keyword(s):  
Secular Variation ◽  
Secular Variation Model ◽  
Variation Model

scholarly journals A candidate secular variation model for IGRF-12 based on Swarm data and inverse geodynamo modelling

2015 ◽  
Vol 67 (1) ◽  
Author(s):  
Alexandre Fournier ◽  
Julien Aubert ◽  
Erwan Thébault
Keyword(s):  
Secular Variation ◽  
Secular Variation Model ◽  
Variation Model

scholarly journals Prediction of geomagnetic field with data assimilation: a candidate secular variation model for IGRF-11

2010 ◽  
Vol 62 (10) ◽  
pp. 775-785 ◽  
Author(s):  
Weijia Kuang ◽  
Zigang Wei ◽  
Richard Holme ◽  
Andrew Tangborn
Keyword(s):  
Data Assimilation ◽  
Secular Variation ◽  
Geomagnetic Field ◽  
Secular Variation Model ◽  
Variation Model

scholarly journals An Investigation into the Use of Satellite Data to Develop a Geomagnetic Secular Variation Model over Southern Africa

2011 ◽  
Vol 10 ◽  
pp. IAGA64-IAGA68 ◽  
Author(s):  
E. Nahayo ◽  
P. B. Kotzé ◽  
M. J. Alport
Keyword(s):  
Satellite Data ◽  
Southern Africa ◽  
Secular Variation ◽  
Geomagnetic Secular Variation ◽  
Secular Variation Model ◽  
Variation Model

scholarly journals On the possibility of extending the IGRF predictive secular variation model to a higher SH degree

2010 ◽  
Vol 62 (10) ◽  
pp. 815-820 ◽  
Author(s):  
Luís Silva ◽  
Stefan Maus ◽  
Gauthier Hulot ◽  
Erwan Thébault
Keyword(s):  
Secular Variation ◽  
Secular Variation Model ◽  
Variation Model

Geomagnetic secular variation Model E

1974 ◽  
Vol 79 (32) ◽  
pp. 4918-4922 ◽  
Author(s):  
Czang-Go Baag ◽  
C. E. Helsley
Keyword(s):  
Secular Variation ◽  
Geomagnetic Secular Variation ◽  
Secular Variation Model ◽  
Variation Model

scholarly journals An IGRF candidate main geomagnetic field model for epoch 2000 and a secular variation model for 2000–2005

2000 ◽  
Vol 52 (12) ◽  
pp. 1137-1148 ◽  
Author(s):  
Benoit Langlais ◽  
Mioara Mandea
Keyword(s):  
Secular Variation ◽  
Geomagnetic Field ◽  
Field Model ◽  
Geomagnetic Field Model ◽  
Secular Variation Model ◽  
Variation Model
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