The Analysis of the Deep Sea Geomagnetic Measurement Platform Rotation's Impact on the Measurement Results

2013 ◽  
Vol 367 ◽  
pp. 322-326
Author(s):  
Dan Wang ◽  
Cheng Chi ◽  
Wei Zhen Chen
Keyword(s):  
Magnetic Field ◽  
Deep Sea ◽  
Geomagnetic Field ◽  
Field Detection ◽  
Measurement Results ◽  
The World ◽  
Magnetic Model ◽  
Geomagnetic Fields ◽  
Geomagnetic Measurement ◽  
Three Components

The deep sea magnetic field detection is influenced by the environment of marine and the platform, the influence of the platform is mainly caused by platform rotation. The variation of the geomagnetic fields three-components caused by different directions of the platform rotation are compared by using the World Magnetic Model WMM2010.The results show that the changes of the three-components of the Earth's magnetic field caused by the platform rotation can not be ignored. So the measured results of the deep sea geomagnetic field detection should be compensated. The conclusion can be used for automatic correction of the deep sea magnetic field observation platform.

The Analysis of Marine Magnetic Field Detection Influenced by the Platform Migration

2013 ◽  
Vol 347-350 ◽  
pp. 648-651
Author(s):  
Dan Wang ◽  
Chi Cheng
Keyword(s):  
Magnetic Field ◽  
Field Observation ◽  
Geomagnetic Field ◽  
Field Variation ◽  
Automatic Correction ◽  
Field Detection ◽  
Geomagnetic Field Variation ◽  
The World ◽  
Magnetic Model

Marine magnetic field detection is influenced by the environment of marine and the platform,The influence of the platform is mainly caused by platform migration.The variation of the geomagnetic field caused by different directions of the platform migration are compared by using the World Magnetic Model WMM2010.We come to the conclusion that the geomagnetic field variation is the biggest in the direction of depth.The conclusion can be used for automatic correction of the marine magnetic field observation platform .

AN ANALYTICAL SOLUTION OF THE COSMIC RAYS TRANSPORT EQUATION IN THE PRESENCE OF THE GEOMAGNETIC FIELD

2002 ◽  
Vol 17 (12n13) ◽  
pp. 1645-1653
Author(s):  
MARINA GIBILISCO
Keyword(s):  
Magnetic Field ◽  
Cosmic Rays ◽  
Analytical Solution ◽  
Transport Equation ◽  
Geomagnetic Field ◽  
The Earth ◽  
Factorization Technique ◽  
Diffusion Motion ◽  
Geomagnetic Fields ◽  
The Magnetic Field

In this work, I study the propagation of cosmic rays inside the magnetic field of the Earth, at distances d ≤ 500 Km from its surface; at these distances, the geomagnetic field deeply influences the diffusion motion of the particles. I compare the different effects of the interplanetary and of the geomagnetic fields, by also discussing their role inside the cosmic rays transport equation; finally, I present an analytical method to solve such an equation through a factorization technique.

scholarly journals Implantable Device Positioning based on Magnetic Field Detection using Genetic Algorithm in Body Area Biosensor Networks

2019 ◽  
Vol 13 (1) ◽  
pp. 11-20
Author(s):  
Shigeaki Ogose ◽  
Shintaro Mori ◽  
Takahiro Sekii
Keyword(s):  
Magnetic Field ◽  
Genetic Algorithm ◽  
Laboratory Test ◽  
Implantable Devices ◽  
Area Network ◽  
Body Area ◽  
Field Detection ◽  
Test Measurement ◽  
Measurement Results ◽  
Positioning Method

Background: Minimally invasive medical care by the aid of Information Communication Technology (ICT) has attracted considerable attention. Sensor nodes including implantable devices within the bio-sensor network or Body Area Network (BAN) have been utilized to reduce the burden on patients. To control the operation of devices properly or collect vital data effectively, it is important to obtain accurate information on their position. Methods: This paper provides an effective positioning method based on the detection of magnetic fields generated from implantable devices using the Genetic Algorithm (GA). After providing the principle of the proposed method, some laboratory test measurement results are given to confirm its effectiveness. Results: Magnetic field detection using multiple magnetic field sensors was achieved. From the results of multiple point measurements on the three-dimensional components of the magnetic field strength, the position of the target was obtained with a smaller error. Laboratory test measurement results are in good agreement with the theoretical values. Conclusion: The proposed positioning method is an effective and an economical approach. It is also effective for detecting moving devices such as a capsule endoscope in a human body. With the aid of the GA, high-speed detection is obtained with a low calculation costs. The compressed sensing method reduces the number of measurement points.

Loss of sleep or loss of dark?

2018 ◽  
Author(s):  
Richard G. Stevens
Keyword(s):  
Mood Disorders ◽  
Deep Sea ◽  
Short Distance ◽  
Water Surface ◽  
Ocean Floor ◽  
Physiological Adaptation ◽  
Poor Sleep ◽  
Short Period ◽  
The World ◽  
Night And Day

Before electricity, night was something akin to the deep sea: just as we could not descend much below the water surface, we also could not investigate the night for more than a short distance, and for a short period of time. Things changed with two inventions: the Bathysphere to plumb the ocean floor, and electricity to light the night for sustained exploration. Exploration led to dominance, and night has become indistinguishable from day in many parts of the world. The benefits of electric light are myriad, but so too are the possible detriments of loss of dark at night, including poor sleep, obesity, diabetes, cancer, and mood disorders. Our primordial physiological adaptation to the night and day cycle is being flummoxed by the maladaptive signals coming from electric lighting around the clock. The topic of sleep and health has finally attained scientific respect, but dark and health is not yet fully appreciated.

scholarly journals Predictions of the geomagnetic secular variation based on the ensemble sequential assimilation of geomagnetic field models by dynamo simulations

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Sabrina Sanchez ◽  
Johannes Wicht ◽  
Julien Bärenzung
Keyword(s):  
Magnetic Field ◽  
Secular Variation ◽  
Geomagnetic Field ◽  
Wave Number ◽  
Main Magnetic Field ◽  
Candidate Model ◽  
Uncertainty Estimates ◽  
Geomagnetic Field Models ◽  
Dipole Configuration

Abstract The IGRF offers an important incentive for testing algorithms predicting the Earth’s magnetic field changes, known as secular variation (SV), in a 5-year range. Here, we present a SV candidate model for the 13th IGRF that stems from a sequential ensemble data assimilation approach (EnKF). The ensemble consists of a number of parallel-running 3D-dynamo simulations. The assimilated data are geomagnetic field snapshots covering the years 1840 to 2000 from the COV-OBS.x1 model and for 2001 to 2020 from the Kalmag model. A spectral covariance localization method, considering the couplings between spherical harmonics of the same equatorial symmetry and same azimuthal wave number, allows decreasing the ensemble size to about a 100 while maintaining the stability of the assimilation. The quality of 5-year predictions is tested for the past two decades. These tests show that the assimilation scheme is able to reconstruct the overall SV evolution. They also suggest that a better 5-year forecast is obtained keeping the SV constant compared to the dynamically evolving SV. However, the quality of the dynamical forecast steadily improves over the full assimilation window (180 years). We therefore propose the instantaneous SV estimate for 2020 from our assimilation as a candidate model for the IGRF-13. The ensemble approach provides uncertainty estimates, which closely match the residual differences with respect to the IGRF-13. Longer term predictions for the evolution of the main magnetic field features over a 50-year range are also presented. We observe the further decrease of the axial dipole at a mean rate of 8 nT/year as well as a deepening and broadening of the South Atlantic Anomaly. The magnetic dip poles are seen to approach an eccentric dipole configuration.

Non-Contact Harmonic Magnetic Field Detection for Parallel Steel Pipeline Localization and Defects Recognition

Measurement ◽  
2021 ◽  
pp. 109534
Author(s):  
Yizhen Zhao ◽  
Xinhua Wang ◽  
Tao Sun ◽  
Yingchun Chen ◽  
Lin Yang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Steel Pipeline ◽  
Field Detection

Triboelectric Nanogenerator using Multiferroic Materials: An Approach for Energy Harvesting and Self-Powered Magnetic Field Detection

Nano Energy ◽  
2021 ◽  
pp. 105964
Author(s):  
Sugato Hajra ◽  
Venkateswaran Vivekananthan ◽  
Manisha Sahu ◽  
Gaurav Khandelwal ◽  
Nirmal Prashanth Maria Joseph Raj ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Triboelectric Nanogenerator ◽  
Multiferroic Materials ◽  
Field Detection ◽  
Self Powered

scholarly journals Comparison of <i>H</i> component geomagnetic field time series obtained at different sites over South America

2018 ◽  
Vol 36 (3) ◽  
pp. 937-943 ◽  
Author(s):  
Maurício J. A. Bolzan ◽  
Clezio M. Denardini ◽  
Alexandre Tardelli
Keyword(s):  
South America ◽  
Geomagnetic Field ◽  
Phase Coherence ◽  
South American ◽  
Data Set ◽  
Geomagnetism And Paleomagnetism ◽  
Strong Phase ◽  
Geomagnetic Fields ◽  
Time Variations ◽  
Physical Phenomena

Abstract. The geomagnetic field in the Brazilian sector is influenced by the South American Magnetic Anomaly (SAMA) that causes a decrease in the magnitude of the local geomagnetic field when compared to other regions in the world. Thus, the magnetometer network and data set of space weather over Brazil led by Embrace are important tools for promoting the understanding of geomagnetic fields over Brazil. In this sense, in this work we used the H component of geomagnetic fields obtained at different sites in South America in order to compare results from the phase coherence obtained from wavelet transform (WT). Results from comparison between Cachoeira Paulista (CXP) and Eusébio (EUS), and Cachoeira Paulista and São Luis (SLZ), indicated that there exist some phenomena that occur simultaneously in both locations, putting them in the same phase coherence. However, there are other phenomena putting both locations in a strong phase difference as observed between CXP and Rio Grande, Argentina (RGA). This study was done for a specific moderate geomagnetic storm that occurred in March 2003. The results are explained in terms of nonlinear interaction between physical phenomena acting in distinct geographic locations and at different times and scales. Keywords. Geomagnetism and paleomagnetism (time variations – diurnal to secular)

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