scholarly journals The influence of the Earth’s magnetic field on strapdown inertial gravimetry using Q-Flex accelerometers: static and dynamic experiments

2021 ◽  
Vol 95 (9) ◽  
Author(s):  
Felix Johann ◽  
David Becker ◽  
Matthias Becker ◽  
Matthias Hoss ◽  
Alexander Löwer ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Measurement Errors ◽  
Calibration Function ◽  
Earth’S Magnetic Field ◽  
Dynamic Experiments ◽  
Dependent Measurement ◽  
Earth's Magnetic Field ◽  
First Time ◽  
Calibration Approach

AbstractIn recent strapdown airborne and shipborne gravimetry campaigns with servo accelerometers of the widely used Q-Flex type, results have been impaired by heading-dependent measurement errors. This paper shows that the effect is, in all likelihood, caused by the sensitivity of the Q-Flex type sensor to the Earth’s magnetic field. In order to assess the influence of magnetic fields on the utilised strapdown IMU of the type iMAR iNAV-RQH-1003, the IMU has been exposed to various magnetic fields of known directions and intensities in a 3-D Helmholtz coil. Based on the results, a calibration function for the vertical accelerometer is developed. At the example of five shipborne and airborne campaigns, it is outlined that under specific circumstances the precision of the gravimetry results can be strongly improved using the magnetic calibration approach: The non-adjusted RMSE at repeated lines decreased from 1.19 to 0.26 mGal at a shipborne campaign at Lake Müritz, Germany. To the knowledge of the authors, a significant influence of the Earth’s magnetic field on strapdown inertial gravimetry is demonstrated for the first time.

The Lapérouse Expedition and Geomagnetism: The Unexpected Discovery of Lamanon’s ‘Lost’ Letter and Ledru’s Instructions

2015 ◽  
Vol 26 (1) ◽  
pp. 1
Author(s):  
Doug Morrison ◽  
Ivan Barko
Keyword(s):  
Magnetic Field ◽  
Nineteenth Century ◽  
Earth’S Magnetic Field ◽  
Early Nineteenth Century ◽  
Terrestrial Magnetism ◽  
Earth's Magnetic Field ◽  
History Of ◽  
Marquis De Condorcet ◽  
First Time

In January 1787, on board Lapérouse's Boussole anchored off Macao, the chevalier de Lamanon wrote a letter to the marquis de Condorcet, the then permanent secretary of the Académie Royale des Sciences in Paris. Lamanon's letter contained a summary of his magnetic observations made up to that point on Lapérouse's famous but ill-fated expedition. The letter, amongst other detail, included evidence that the Earth's magnetic field increased in intensity from the equator towards the poles. Sent to Condorcet via the then minister for the French Navy (the maréchal de Castries), the letter was subsequently lost, but not before it was copied. The copy, with early nineteenth-century ownership identified first to Nicolas Philippe Ledru and subsequently to Louis Isidore Duperrey, was itself then lost for over 150 years, but recently rediscovered bound-in with other manuscripts related to the Lapérouse expedition and terrestrial magnetism, including instructions by Ledru and remarks written in the 1830s and 1840s by Duperrey on Lamanon's letter and observations. The significance of Lamanon's letter and the Ledru and Duperrey manuscripts to the history of geomagnetism is discussed here. Duperrey's notes are transcribed in French for the first time and the Lamanon, Ledru and Duperrey manuscripts are translated into English, also for the first time.

scholarly journals A magnetometer for the measurement of the Earth's vertical magnetic intensity in C. G. S. measure

1928 ◽  
Vol 117 (777) ◽  
pp. 434-458 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Vertical Component ◽  
Field Measurements ◽  
Horizontal Component ◽  
Magnetic Intensity ◽  
Earth’S Magnetic Field ◽  
Simple Operation ◽  
Horizontal Field ◽  
Earth's Magnetic Field

The measurement of the vertical component of the earth’s magnetic field is a less simple operation than that of the horizontal component. The horizontal field measurements are on a satisfactory basis, whether made by the swinging magnet method, or by the more recently developed electric magnetometers, in which known magnetic fields may be provided by means of known currents flowing through coils of known dimensions.

A Study of the Magnetic Field of the Moon

1962 ◽  
Vol 14 ◽  
pp. 45-52 ◽  
Author(s):  
S. S. Dolginov ◽  
E. G. Eroshenko ◽  
L. I. Zhuzgov ◽  
N. V. Pushkov
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
The Moon ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field ◽  
The Magnetic Field

The question as to whether the planets and their satellites possess magnetic fields unavoidably arose in connection with the question as to the origin of the Earth's mágnetic field and the nature of a number of geophysical effects.

Study of the Magnetic Fields of Residential Buildings and their Impact on Human Health

2021 ◽  
Vol 23 (4) ◽  
pp. 370-382
Author(s):  
Radka Kostadinova ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Residential Buildings ◽  
Health Condition ◽  
Residential Areas ◽  
Earth’S Magnetic Field ◽  
The People ◽  
Specific Device ◽  
Earth's Magnetic Field ◽  
The Magnetic Field

With the prosperity of civilization people are more often put to the vibrations of the Earth’s magnetic field, which they are affecting by themselves in various ways. Settlements and residential areas, distant and electrical conductors, with its constantly changing electromagnetic field create strong deformations and weaken the Earth’s magnetic field. Is it possible that the reduction of the magnetic fields, in such buildings, to lead to illness and discomfort of the people living there. Is it possible that chronic discomfort and illness of the humans who inhabit those buildings don’t suffer from conditions, we usually connect with junk food, polluted air and the our stressful lifestyle, but are actually a result of the greatly reduced and changing magnetic field in the populated areas. With the research project developed by Tereza Stefanova with the help of students from the school, we tried to answer these questions. The purpose of our research is to: 1. Measure the magnetic field in buildings in our city, which differ by their construction and height and also to measure outside the city. 2. Determine if the change of the magnetic field and possible magnetic anomalies affect our health condition. The tasks we had to do to achieve our goal is to do take the measurements with a specific device.

scholarly journals Magnetosensitive neurons mediate geomagnetic orientation in Caenorhabditis elegans

eLife ◽  
2015 ◽  
Vol 4 ◽  
Author(s):  
Andrés Vidal-Gadea ◽  
Kristi Ward ◽  
Celia Beron ◽  
Navid Ghorashian ◽  
Sertan Gokce ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Caenorhabditis Elegans ◽  
Magnetic Fields ◽  
Three Dimensions ◽  
Magnetic Orientation ◽  
Earth’S Magnetic Field ◽  
C Elegans ◽  
Central Neurons ◽  
Native Soil ◽  
Earth's Magnetic Field

Many organisms spanning from bacteria to mammals orient to the earth's magnetic field. For a few animals, central neurons responsive to earth-strength magnetic fields have been identified; however, magnetosensory neurons have yet to be identified in any animal. We show that the nematode Caenorhabditis elegans orients to the earth's magnetic field during vertical burrowing migrations. Well-fed worms migrated up, while starved worms migrated down. Populations isolated from around the world, migrated at angles to the magnetic vector that would optimize vertical translation in their native soil, with northern- and southern-hemisphere worms displaying opposite migratory preferences. Magnetic orientation and vertical migrations required the TAX-4 cyclic nucleotide-gated ion channel in the AFD sensory neuron pair. Calcium imaging showed that these neurons respond to magnetic fields even without synaptic input. C. elegans may have adapted magnetic orientation to simplify their vertical burrowing migration by reducing the orientation task from three dimensions to one.

Magnetic "field free" spaces for paleomagnetism, rock magnetism, and other studies

1969 ◽  
Vol 6 (5) ◽  
pp. 1312-1316 ◽  
Author(s):  
J. L. Roy ◽  
W. A. Robertson ◽  
C. Keeping
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Rock Magnetism ◽  
Magnetic Storms ◽  
Earth’S Magnetic Field ◽  
Residual Field ◽  
Earth's Magnetic Field ◽  
Free Spaces

An array of five sets of 8-ft (244-cm) square coils for compensation of the earth's magnetic field at five locations is described. A fluxgate system is used to keep the residual field within 2 gammas during magnetic storms and 1 gamma in other instances. Constant fields (1 Oe down to a few gammas), for experiments in small magnetic fields, can be produced at four locations independently.

The Atlas of the Earth's Magnetic Field

2012 ◽  
Author(s):  
A. Soloviev ◽  
A. Khokhlov ◽  
E. Jalkovsky ◽  
A. Berezko ◽  
A. Lebedev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field
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