Simulation study on reconstruction of electric conductivity distribution from magnetic vector field measurements

2004 ◽  
Vol 15 (7) ◽  
pp. 1239-1250
Author(s):  
C Sumi ◽  
K Nagumo
Keyword(s):  
Vector Field ◽  
Electric Conductivity ◽  
Simulation Study ◽  
Field Measurements ◽  
Magnetic Vector ◽  
Conductivity Distribution

scholarly journals The Kalmag Model as a Candidate for IGRF-13

2020 ◽  
Author(s):  
Julien Baerenzung ◽  
Matthias Holschneider ◽  
Johannes Wicht ◽  
Vincent Lesur ◽  
Sabrina Sanchez
Keyword(s):  
Inverse Problem ◽  
Kalman Filter ◽  
Vector Field ◽  
Geomagnetic Field ◽  
Time Window ◽  
Field Measurements ◽  
Covariance Matrices ◽  
Smoothing Algorithm ◽  
Mean Fields ◽  
Observable Field

Abstract We present a new model of the Geomagnetic field spanning the last 20 years and called Kalmag. Deriving from the assimilation of CHAMP and SWARM vector field measurements, it separates the different contributions to the observable field through parameterized prior covariance matrices. To make the inverse problem numerically feasible it has been sequentialized in time though the combination of a Kalman filter and a smoothing algorithm. The model provides reliable estimates of past, present and future mean fields and associated uncertainties. The version presented here is an update of our IGRF candidates, the amount of assimilated data has been doubled and the considered time window has been extended from [2000.5,2019.74] to [2000.5,2020.33].

Singularity properties of null killing magnetic curves in Minkowski 3-space

2020 ◽  
Vol 17 (09) ◽  
pp. 2050141 ◽  
Author(s):  
Jianguo Sun
Keyword(s):  
Vector Field ◽  
Magnetic Vector ◽  
Geometrical Properties ◽  
Singular Loci ◽  
Magnetic Curve

We reconstruct the Cartan Equations of null Killing magnetic curve [Formula: see text] in [Formula: see text] with Killing magnetic vector field [Formula: see text] under the new Cartan frame [Formula: see text], which describe some new geometrical properties of [Formula: see text]. The singularity properties of the rectifying surfaces and the binormal osculating surfaces of null Killing magnetic curves are given. As an application, two examples are given to explain the main results, where the singular loci of null Killing magnetic curves are obtained.

Singularity properties of killing magnetic curves in Minkowski 3-space

2019 ◽  
Vol 16 (08) ◽  
pp. 1950123 ◽  
Author(s):  
Jianguo Sun
Keyword(s):  
Vector Field ◽  
Magnetic Vector ◽  
Geometrical Properties

We define the coordinate equations of killing magnetic curves [Formula: see text] in [Formula: see text] with the magnetic vector field [Formula: see text] under the frame [Formula: see text]. In particular, this yields to describe the geometrical properties and singularities of the magnetic curves and the magnetic normal binormal surfaces. Meanwhile, we establish the relationships between singularity types of the magnetic normal binormal surfaces and geometrical invariants of the magnetic curves. As an application, we give an example to explain the main results in this paper, where we give the classification of singularity types of the magnetic curves.

Magnetic Vector-field of Optical Antennas from Electromagnetic Duality

2012 ◽  
Author(s):  
Robert L. Olmon ◽  
Xiaoji G. Xu ◽  
Kseniya S. Deryckx ◽  
Brian A. Lail ◽  
Markus B. Raschke
Keyword(s):  
Vector Field ◽  
Optical Antennas ◽  
Magnetic Vector

scholarly journals Analysis of quasi-optical power combiners by vector field measurements at 150 GHz

2007 ◽  
Vol 5 ◽  
pp. 419-425 ◽  
Author(s):  
R. Judaschke ◽  
J. Weinzierl
Keyword(s):  
Vector Field ◽  
Electric Field ◽  
Antenna Array ◽  
Optical Power ◽  
Field Measurements ◽  
Horn Antenna ◽  
Power Combining ◽  
Power Combiners ◽  
Submillimeter Wavelengths ◽  
Receiving Antenna

Abstract. A Two-dimensional quasi-optical power dividing/combining circuit has been experimentally investigated at 150 GHz. It consists of a rectangular horn antenna array as receiving/transmitting unit and a dual offset reflector setup to match the radiated field(s) to the pattern of the receiving antenna(s). To verify both design and adjustment of the quasi-optical circuit, electric field scans have been performed in selected planes and volumes of the setup. To measure the spatial electric field distribution, a vector field measurement system has been developed which operates in the frequency range between 148 GHz and 152 GHz. Excellent agreement between calculated and measured results for a horn antenna array approve the predicted results calculated under the physical optics approximation. Measured power dividing/combining efficiency of the passive structure of 63% for an inter-element spacing of 10$ \\lambda$ indicates that the power combining principle is a suitable method up to submillimeter wavelengths.

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