scholarly journals Regional geomagnetic field modelling: the contribution of the Istituto Nazionale di Geofisica

1997 ◽  
Vol 40 (5) ◽  
Author(s):  
A. De Santis ◽  
M. Chiappini ◽  
G. Dominici ◽  
A. Meloni
Keyword(s):  
Magnetic Field ◽  
Harmonic Analysis ◽  
Geomagnetic Field ◽  
Spherical Harmonic Analysis ◽  
Spherical Cap ◽  
Field Modelling ◽  
Term Basis ◽  
Time Variations ◽  
Spherical Cap Harmonic Analysis ◽  
Cap Analysis

Models of the geomagnetic field are mathematical expressions able to represent the Earth's magnetic field space and time variations. Time variations on the long term basis are represented by the so-called secular variation. This paper describes and reviews recent activities of the Italian group at the Istituto Nazionale di Geofisica in regional magnetic field modelling. The models are introduced starting from the classical technique of Spherical Harmonic Analysis (SHA) undertaken for the first time by Gauss, the polynomial analysis and the regional harmonic analysis, specifically introduced as a regional analogue of SHA. In this last group the recent techniques of Spherical Cap Harmonic Analysis (SCHA), Translated Origin Spherical Cap Analysis (TOSCA) and Adjusted Spherical Cap Harmonic Analysis (ASHA) are also described and discussed.

scholarly journals Spherical Cap Harmonic Analysis of the Geomagnetic Field over East Asia.

1994 ◽  
Vol 46 (9) ◽  
pp. 789-795 ◽  
Author(s):  
Zhen-chang An ◽  
Dong-hai Tan ◽  
Yuan-fang Xu ◽  
V. P. Golovkov ◽  
N. M. Rotanova ◽  
...  
Keyword(s):  
East Asia ◽  
Harmonic Analysis ◽  
Geomagnetic Field ◽  
Spherical Cap ◽  
Spherical Cap Harmonic Analysis

Spherical cap harmonic analysis applied to the Scandinavian geomagnetic field 1985.0

1988 ◽  
Vol 41 (3-6) ◽  
pp. 177-186 ◽  
Author(s):  
Heikki Nevanlinna ◽  
Joumi Rynö ◽  
Gerry V. Haines ◽  
Kjell Borg
Keyword(s):  
Harmonic Analysis ◽  
Geomagnetic Field ◽  
Spherical Cap ◽  
Spherical Cap Harmonic Analysis

scholarly journals Modelling Secular Variation in the Southwest Pacific

2019 ◽  
pp. 1-20
Author(s):  
Maha Ali Alfheid ◽  
Mohana Faroug Attia
Keyword(s):  
Magnetic Field ◽  
Geomagnetic Field ◽  
Regional Model ◽  
Pacific Region ◽  
Spherical Cap ◽  
Southwest Pacific ◽  
The Past ◽  
Self Consistent ◽  
Spherical Cap Harmonic Analysis ◽  
The Magnetic Field

A spherical cap harmonic analysis (SCHA) model has been used to derive a high resolution regional model of the geomagnetic field in the southwest Pacific region over the past 400 years. Two different methods, a self-consistent and the gufm1 dipole method, have been used to fill in gaps in the available data. The data used in the analysis were largely measurements of the magnetic field recorded in ships logs on voyages of exploration in the region.  The method chosen for the investigation used a spherical cap of radius

Spherical Cap Harmonic Analysis of the Geomagnetic Field in the Beijing-Tianjin-Hebei Region

2004 ◽  
Vol 47 (6) ◽  
pp. 1128-1134 ◽  
Author(s):  
Zuo-Wen GU ◽  
Zhen-Chang AN ◽  
Jin-Tian GUAO ◽  
Wei HAN ◽  
Zhi-Jia ZHAN
Keyword(s):  
Harmonic Analysis ◽  
Geomagnetic Field ◽  
Spherical Cap ◽  
Spherical Cap Harmonic Analysis

scholarly journals Indonesian Earth’s Lithospheric Magnetic Field modelling using Spherical Cap Harmonic Analysis Method

2021 ◽  
Vol 873 (1) ◽  
pp. 012030
Author(s):  
Ilham ◽  
M Syirojudin ◽  
R Margiono ◽  
A Marsono ◽  
N Ardiana
Keyword(s):  
Magnetic Field ◽  
Harmonic Analysis ◽  
Magnetic Data ◽  
Spherical Cap ◽  
Crust And Upper Mantle ◽  
Repeat Station ◽  
Station Data ◽  
Lithospheric Magnetic Field ◽  
Spherical Cap Harmonic Analysis ◽  
Swarm Satellite

Abstract The earth’s lithospheric magnetic field is part of the main earth’s magnetic field. The lithospheric field has a very small value compared to the Earth’s main magnetic field, approximately less than 1%, and this field is generated at the earth’s crust and upper mantle. Modelling of lithospheric field is useful mainly for predicting the distribution of the value of lithospheric fields and to determine the magnetic anomaly. In this research, modelling the Earth’s lithospheric magnetic field uses Spherical Cap Harmonic Analysis (SCHA) method and this method can do modelling using regional magnetic data. The data used for the modelling are magnetic repeat station data in Indonesia region (BMKG’s Epoch) and SWARM satellite data. The results of the modelling using integrated SWARM satellite and repeat station data produce RMSE values of 64.0834 nT and the expansion of index K is 70. In addition, the results of the modelling resolution is 1.50. The value’s range of modelling’s result are -987.192 – 998.239 nT for X component, -968.189 – 949.438 nT for Y component, -981.266 – 608.676 nT for Z component, and -904.151 – 997.389 nT for total intensity are.

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